File: | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp |
Warning: | line 1633, column 9 Called C++ object pointer is null |
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1 | //===- SelectionDAGISel.cpp - Implement the SelectionDAGISel class --------===// | |||
2 | // | |||
3 | // The LLVM Compiler Infrastructure | |||
4 | // | |||
5 | // This file is distributed under the University of Illinois Open Source | |||
6 | // License. See LICENSE.TXT for details. | |||
7 | // | |||
8 | //===----------------------------------------------------------------------===// | |||
9 | // | |||
10 | // This implements the SelectionDAGISel class. | |||
11 | // | |||
12 | //===----------------------------------------------------------------------===// | |||
13 | ||||
14 | #include "llvm/CodeGen/SelectionDAGISel.h" | |||
15 | #include "ScheduleDAGSDNodes.h" | |||
16 | #include "SelectionDAGBuilder.h" | |||
17 | #include "llvm/ADT/APInt.h" | |||
18 | #include "llvm/ADT/DenseMap.h" | |||
19 | #include "llvm/ADT/None.h" | |||
20 | #include "llvm/ADT/PostOrderIterator.h" | |||
21 | #include "llvm/ADT/STLExtras.h" | |||
22 | #include "llvm/ADT/SmallPtrSet.h" | |||
23 | #include "llvm/ADT/SmallSet.h" | |||
24 | #include "llvm/ADT/SmallVector.h" | |||
25 | #include "llvm/ADT/Statistic.h" | |||
26 | #include "llvm/ADT/StringRef.h" | |||
27 | #include "llvm/Analysis/AliasAnalysis.h" | |||
28 | #include "llvm/Analysis/BranchProbabilityInfo.h" | |||
29 | #include "llvm/Analysis/CFG.h" | |||
30 | #include "llvm/Analysis/OptimizationRemarkEmitter.h" | |||
31 | #include "llvm/Analysis/TargetLibraryInfo.h" | |||
32 | #include "llvm/CodeGen/FastISel.h" | |||
33 | #include "llvm/CodeGen/FunctionLoweringInfo.h" | |||
34 | #include "llvm/CodeGen/GCMetadata.h" | |||
35 | #include "llvm/CodeGen/ISDOpcodes.h" | |||
36 | #include "llvm/CodeGen/MachineBasicBlock.h" | |||
37 | #include "llvm/CodeGen/MachineFrameInfo.h" | |||
38 | #include "llvm/CodeGen/MachineFunction.h" | |||
39 | #include "llvm/CodeGen/MachineFunctionPass.h" | |||
40 | #include "llvm/CodeGen/MachineInstr.h" | |||
41 | #include "llvm/CodeGen/MachineInstrBuilder.h" | |||
42 | #include "llvm/CodeGen/MachineMemOperand.h" | |||
43 | #include "llvm/CodeGen/MachineOperand.h" | |||
44 | #include "llvm/CodeGen/MachinePassRegistry.h" | |||
45 | #include "llvm/CodeGen/MachineRegisterInfo.h" | |||
46 | #include "llvm/CodeGen/MachineValueType.h" | |||
47 | #include "llvm/CodeGen/SchedulerRegistry.h" | |||
48 | #include "llvm/CodeGen/SelectionDAG.h" | |||
49 | #include "llvm/CodeGen/SelectionDAGNodes.h" | |||
50 | #include "llvm/CodeGen/StackProtector.h" | |||
51 | #include "llvm/CodeGen/TargetInstrInfo.h" | |||
52 | #include "llvm/CodeGen/TargetLowering.h" | |||
53 | #include "llvm/CodeGen/TargetRegisterInfo.h" | |||
54 | #include "llvm/CodeGen/TargetSubtargetInfo.h" | |||
55 | #include "llvm/CodeGen/ValueTypes.h" | |||
56 | #include "llvm/IR/BasicBlock.h" | |||
57 | #include "llvm/IR/Constants.h" | |||
58 | #include "llvm/IR/DataLayout.h" | |||
59 | #include "llvm/IR/DebugInfoMetadata.h" | |||
60 | #include "llvm/IR/DebugLoc.h" | |||
61 | #include "llvm/IR/DiagnosticInfo.h" | |||
62 | #include "llvm/IR/Dominators.h" | |||
63 | #include "llvm/IR/Function.h" | |||
64 | #include "llvm/IR/InlineAsm.h" | |||
65 | #include "llvm/IR/InstrTypes.h" | |||
66 | #include "llvm/IR/Instruction.h" | |||
67 | #include "llvm/IR/Instructions.h" | |||
68 | #include "llvm/IR/IntrinsicInst.h" | |||
69 | #include "llvm/IR/Intrinsics.h" | |||
70 | #include "llvm/IR/Metadata.h" | |||
71 | #include "llvm/IR/Type.h" | |||
72 | #include "llvm/IR/User.h" | |||
73 | #include "llvm/IR/Value.h" | |||
74 | #include "llvm/MC/MCInstrDesc.h" | |||
75 | #include "llvm/MC/MCRegisterInfo.h" | |||
76 | #include "llvm/Pass.h" | |||
77 | #include "llvm/Support/BranchProbability.h" | |||
78 | #include "llvm/Support/Casting.h" | |||
79 | #include "llvm/Support/CodeGen.h" | |||
80 | #include "llvm/Support/CommandLine.h" | |||
81 | #include "llvm/Support/Compiler.h" | |||
82 | #include "llvm/Support/Debug.h" | |||
83 | #include "llvm/Support/ErrorHandling.h" | |||
84 | #include "llvm/Support/KnownBits.h" | |||
85 | #include "llvm/Support/Timer.h" | |||
86 | #include "llvm/Support/raw_ostream.h" | |||
87 | #include "llvm/Target/TargetIntrinsicInfo.h" | |||
88 | #include "llvm/Target/TargetMachine.h" | |||
89 | #include "llvm/Target/TargetOptions.h" | |||
90 | #include "llvm/Transforms/Utils/BasicBlockUtils.h" | |||
91 | #include <algorithm> | |||
92 | #include <cassert> | |||
93 | #include <cstdint> | |||
94 | #include <iterator> | |||
95 | #include <limits> | |||
96 | #include <memory> | |||
97 | #include <string> | |||
98 | #include <utility> | |||
99 | #include <vector> | |||
100 | ||||
101 | using namespace llvm; | |||
102 | ||||
103 | #define DEBUG_TYPE"isel" "isel" | |||
104 | ||||
105 | STATISTIC(NumFastIselFailures, "Number of instructions fast isel failed on")static llvm::Statistic NumFastIselFailures = {"isel", "NumFastIselFailures" , "Number of instructions fast isel failed on", {0}, {false}}; | |||
106 | STATISTIC(NumFastIselSuccess, "Number of instructions fast isel selected")static llvm::Statistic NumFastIselSuccess = {"isel", "NumFastIselSuccess" , "Number of instructions fast isel selected", {0}, {false}}; | |||
107 | STATISTIC(NumFastIselBlocks, "Number of blocks selected entirely by fast isel")static llvm::Statistic NumFastIselBlocks = {"isel", "NumFastIselBlocks" , "Number of blocks selected entirely by fast isel", {0}, {false }}; | |||
108 | STATISTIC(NumDAGBlocks, "Number of blocks selected using DAG")static llvm::Statistic NumDAGBlocks = {"isel", "NumDAGBlocks" , "Number of blocks selected using DAG", {0}, {false}}; | |||
109 | STATISTIC(NumDAGIselRetries,"Number of times dag isel has to try another path")static llvm::Statistic NumDAGIselRetries = {"isel", "NumDAGIselRetries" , "Number of times dag isel has to try another path", {0}, {false }}; | |||
110 | STATISTIC(NumEntryBlocks, "Number of entry blocks encountered")static llvm::Statistic NumEntryBlocks = {"isel", "NumEntryBlocks" , "Number of entry blocks encountered", {0}, {false}}; | |||
111 | STATISTIC(NumFastIselFailLowerArguments,static llvm::Statistic NumFastIselFailLowerArguments = {"isel" , "NumFastIselFailLowerArguments", "Number of entry blocks where fast isel failed to lower arguments" , {0}, {false}} | |||
112 | "Number of entry blocks where fast isel failed to lower arguments")static llvm::Statistic NumFastIselFailLowerArguments = {"isel" , "NumFastIselFailLowerArguments", "Number of entry blocks where fast isel failed to lower arguments" , {0}, {false}}; | |||
113 | ||||
114 | static cl::opt<int> EnableFastISelAbort( | |||
115 | "fast-isel-abort", cl::Hidden, | |||
116 | cl::desc("Enable abort calls when \"fast\" instruction selection " | |||
117 | "fails to lower an instruction: 0 disable the abort, 1 will " | |||
118 | "abort but for args, calls and terminators, 2 will also " | |||
119 | "abort for argument lowering, and 3 will never fallback " | |||
120 | "to SelectionDAG.")); | |||
121 | ||||
122 | static cl::opt<bool> EnableFastISelFallbackReport( | |||
123 | "fast-isel-report-on-fallback", cl::Hidden, | |||
124 | cl::desc("Emit a diagnostic when \"fast\" instruction selection " | |||
125 | "falls back to SelectionDAG.")); | |||
126 | ||||
127 | static cl::opt<bool> | |||
128 | UseMBPI("use-mbpi", | |||
129 | cl::desc("use Machine Branch Probability Info"), | |||
130 | cl::init(true), cl::Hidden); | |||
131 | ||||
132 | #ifndef NDEBUG | |||
133 | static cl::opt<std::string> | |||
134 | FilterDAGBasicBlockName("filter-view-dags", cl::Hidden, | |||
135 | cl::desc("Only display the basic block whose name " | |||
136 | "matches this for all view-*-dags options")); | |||
137 | static cl::opt<bool> | |||
138 | ViewDAGCombine1("view-dag-combine1-dags", cl::Hidden, | |||
139 | cl::desc("Pop up a window to show dags before the first " | |||
140 | "dag combine pass")); | |||
141 | static cl::opt<bool> | |||
142 | ViewLegalizeTypesDAGs("view-legalize-types-dags", cl::Hidden, | |||
143 | cl::desc("Pop up a window to show dags before legalize types")); | |||
144 | static cl::opt<bool> | |||
145 | ViewLegalizeDAGs("view-legalize-dags", cl::Hidden, | |||
146 | cl::desc("Pop up a window to show dags before legalize")); | |||
147 | static cl::opt<bool> | |||
148 | ViewDAGCombine2("view-dag-combine2-dags", cl::Hidden, | |||
149 | cl::desc("Pop up a window to show dags before the second " | |||
150 | "dag combine pass")); | |||
151 | static cl::opt<bool> | |||
152 | ViewDAGCombineLT("view-dag-combine-lt-dags", cl::Hidden, | |||
153 | cl::desc("Pop up a window to show dags before the post legalize types" | |||
154 | " dag combine pass")); | |||
155 | static cl::opt<bool> | |||
156 | ViewISelDAGs("view-isel-dags", cl::Hidden, | |||
157 | cl::desc("Pop up a window to show isel dags as they are selected")); | |||
158 | static cl::opt<bool> | |||
159 | ViewSchedDAGs("view-sched-dags", cl::Hidden, | |||
160 | cl::desc("Pop up a window to show sched dags as they are processed")); | |||
161 | static cl::opt<bool> | |||
162 | ViewSUnitDAGs("view-sunit-dags", cl::Hidden, | |||
163 | cl::desc("Pop up a window to show SUnit dags after they are processed")); | |||
164 | #else | |||
165 | static const bool ViewDAGCombine1 = false, | |||
166 | ViewLegalizeTypesDAGs = false, ViewLegalizeDAGs = false, | |||
167 | ViewDAGCombine2 = false, | |||
168 | ViewDAGCombineLT = false, | |||
169 | ViewISelDAGs = false, ViewSchedDAGs = false, | |||
170 | ViewSUnitDAGs = false; | |||
171 | #endif | |||
172 | ||||
173 | //===---------------------------------------------------------------------===// | |||
174 | /// | |||
175 | /// RegisterScheduler class - Track the registration of instruction schedulers. | |||
176 | /// | |||
177 | //===---------------------------------------------------------------------===// | |||
178 | MachinePassRegistry RegisterScheduler::Registry; | |||
179 | ||||
180 | //===---------------------------------------------------------------------===// | |||
181 | /// | |||
182 | /// ISHeuristic command line option for instruction schedulers. | |||
183 | /// | |||
184 | //===---------------------------------------------------------------------===// | |||
185 | static cl::opt<RegisterScheduler::FunctionPassCtor, false, | |||
186 | RegisterPassParser<RegisterScheduler>> | |||
187 | ISHeuristic("pre-RA-sched", | |||
188 | cl::init(&createDefaultScheduler), cl::Hidden, | |||
189 | cl::desc("Instruction schedulers available (before register" | |||
190 | " allocation):")); | |||
191 | ||||
192 | static RegisterScheduler | |||
193 | defaultListDAGScheduler("default", "Best scheduler for the target", | |||
194 | createDefaultScheduler); | |||
195 | ||||
196 | namespace llvm { | |||
197 | ||||
198 | //===--------------------------------------------------------------------===// | |||
199 | /// \brief This class is used by SelectionDAGISel to temporarily override | |||
200 | /// the optimization level on a per-function basis. | |||
201 | class OptLevelChanger { | |||
202 | SelectionDAGISel &IS; | |||
203 | CodeGenOpt::Level SavedOptLevel; | |||
204 | bool SavedFastISel; | |||
205 | ||||
206 | public: | |||
207 | OptLevelChanger(SelectionDAGISel &ISel, | |||
208 | CodeGenOpt::Level NewOptLevel) : IS(ISel) { | |||
209 | SavedOptLevel = IS.OptLevel; | |||
210 | if (NewOptLevel == SavedOptLevel) | |||
211 | return; | |||
212 | IS.OptLevel = NewOptLevel; | |||
213 | IS.TM.setOptLevel(NewOptLevel); | |||
214 | DEBUG(dbgs() << "\nChanging optimization level for Function "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\nChanging optimization level for Function " << IS.MF->getFunction().getName() << "\n"; } } while (false) | |||
215 | << IS.MF->getFunction().getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\nChanging optimization level for Function " << IS.MF->getFunction().getName() << "\n"; } } while (false); | |||
216 | DEBUG(dbgs() << "\tBefore: -O" << SavedOptLeveldo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\tBefore: -O" << SavedOptLevel << " ; After: -O" << NewOptLevel << "\n"; } } while (false) | |||
217 | << " ; After: -O" << NewOptLevel << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\tBefore: -O" << SavedOptLevel << " ; After: -O" << NewOptLevel << "\n"; } } while (false); | |||
218 | SavedFastISel = IS.TM.Options.EnableFastISel; | |||
219 | if (NewOptLevel == CodeGenOpt::None) { | |||
220 | IS.TM.setFastISel(IS.TM.getO0WantsFastISel()); | |||
221 | DEBUG(dbgs() << "\tFastISel is "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\tFastISel is " << (IS.TM. Options.EnableFastISel ? "enabled" : "disabled") << "\n" ; } } while (false) | |||
222 | << (IS.TM.Options.EnableFastISel ? "enabled" : "disabled")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\tFastISel is " << (IS.TM. Options.EnableFastISel ? "enabled" : "disabled") << "\n" ; } } while (false) | |||
223 | << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\tFastISel is " << (IS.TM. Options.EnableFastISel ? "enabled" : "disabled") << "\n" ; } } while (false); | |||
224 | } | |||
225 | } | |||
226 | ||||
227 | ~OptLevelChanger() { | |||
228 | if (IS.OptLevel == SavedOptLevel) | |||
229 | return; | |||
230 | DEBUG(dbgs() << "\nRestoring optimization level for Function "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\nRestoring optimization level for Function " << IS.MF->getFunction().getName() << "\n"; } } while (false) | |||
231 | << IS.MF->getFunction().getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\nRestoring optimization level for Function " << IS.MF->getFunction().getName() << "\n"; } } while (false); | |||
232 | DEBUG(dbgs() << "\tBefore: -O" << IS.OptLeveldo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\tBefore: -O" << IS.OptLevel << " ; After: -O" << SavedOptLevel << "\n" ; } } while (false) | |||
233 | << " ; After: -O" << SavedOptLevel << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\tBefore: -O" << IS.OptLevel << " ; After: -O" << SavedOptLevel << "\n" ; } } while (false); | |||
234 | IS.OptLevel = SavedOptLevel; | |||
235 | IS.TM.setOptLevel(SavedOptLevel); | |||
236 | IS.TM.setFastISel(SavedFastISel); | |||
237 | } | |||
238 | }; | |||
239 | ||||
240 | //===--------------------------------------------------------------------===// | |||
241 | /// createDefaultScheduler - This creates an instruction scheduler appropriate | |||
242 | /// for the target. | |||
243 | ScheduleDAGSDNodes* createDefaultScheduler(SelectionDAGISel *IS, | |||
244 | CodeGenOpt::Level OptLevel) { | |||
245 | const TargetLowering *TLI = IS->TLI; | |||
246 | const TargetSubtargetInfo &ST = IS->MF->getSubtarget(); | |||
247 | ||||
248 | // Try first to see if the Target has its own way of selecting a scheduler | |||
249 | if (auto *SchedulerCtor = ST.getDAGScheduler(OptLevel)) { | |||
250 | return SchedulerCtor(IS, OptLevel); | |||
251 | } | |||
252 | ||||
253 | if (OptLevel == CodeGenOpt::None || | |||
254 | (ST.enableMachineScheduler() && ST.enableMachineSchedDefaultSched()) || | |||
255 | TLI->getSchedulingPreference() == Sched::Source) | |||
256 | return createSourceListDAGScheduler(IS, OptLevel); | |||
257 | if (TLI->getSchedulingPreference() == Sched::RegPressure) | |||
258 | return createBURRListDAGScheduler(IS, OptLevel); | |||
259 | if (TLI->getSchedulingPreference() == Sched::Hybrid) | |||
260 | return createHybridListDAGScheduler(IS, OptLevel); | |||
261 | if (TLI->getSchedulingPreference() == Sched::VLIW) | |||
262 | return createVLIWDAGScheduler(IS, OptLevel); | |||
263 | assert(TLI->getSchedulingPreference() == Sched::ILP &&(static_cast <bool> (TLI->getSchedulingPreference() == Sched::ILP && "Unknown sched type!") ? void (0) : __assert_fail ("TLI->getSchedulingPreference() == Sched::ILP && \"Unknown sched type!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 264, __extension__ __PRETTY_FUNCTION__)) | |||
264 | "Unknown sched type!")(static_cast <bool> (TLI->getSchedulingPreference() == Sched::ILP && "Unknown sched type!") ? void (0) : __assert_fail ("TLI->getSchedulingPreference() == Sched::ILP && \"Unknown sched type!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 264, __extension__ __PRETTY_FUNCTION__)); | |||
265 | return createILPListDAGScheduler(IS, OptLevel); | |||
266 | } | |||
267 | ||||
268 | } // end namespace llvm | |||
269 | ||||
270 | // EmitInstrWithCustomInserter - This method should be implemented by targets | |||
271 | // that mark instructions with the 'usesCustomInserter' flag. These | |||
272 | // instructions are special in various ways, which require special support to | |||
273 | // insert. The specified MachineInstr is created but not inserted into any | |||
274 | // basic blocks, and this method is called to expand it into a sequence of | |||
275 | // instructions, potentially also creating new basic blocks and control flow. | |||
276 | // When new basic blocks are inserted and the edges from MBB to its successors | |||
277 | // are modified, the method should insert pairs of <OldSucc, NewSucc> into the | |||
278 | // DenseMap. | |||
279 | MachineBasicBlock * | |||
280 | TargetLowering::EmitInstrWithCustomInserter(MachineInstr &MI, | |||
281 | MachineBasicBlock *MBB) const { | |||
282 | #ifndef NDEBUG | |||
283 | dbgs() << "If a target marks an instruction with " | |||
284 | "'usesCustomInserter', it must implement " | |||
285 | "TargetLowering::EmitInstrWithCustomInserter!"; | |||
286 | #endif | |||
287 | llvm_unreachable(nullptr)::llvm::llvm_unreachable_internal(nullptr, "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 287); | |||
288 | } | |||
289 | ||||
290 | void TargetLowering::AdjustInstrPostInstrSelection(MachineInstr &MI, | |||
291 | SDNode *Node) const { | |||
292 | assert(!MI.hasPostISelHook() &&(static_cast <bool> (!MI.hasPostISelHook() && "If a target marks an instruction with 'hasPostISelHook', " "it must implement TargetLowering::AdjustInstrPostInstrSelection!" ) ? void (0) : __assert_fail ("!MI.hasPostISelHook() && \"If a target marks an instruction with 'hasPostISelHook', \" \"it must implement TargetLowering::AdjustInstrPostInstrSelection!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 294, __extension__ __PRETTY_FUNCTION__)) | |||
293 | "If a target marks an instruction with 'hasPostISelHook', "(static_cast <bool> (!MI.hasPostISelHook() && "If a target marks an instruction with 'hasPostISelHook', " "it must implement TargetLowering::AdjustInstrPostInstrSelection!" ) ? void (0) : __assert_fail ("!MI.hasPostISelHook() && \"If a target marks an instruction with 'hasPostISelHook', \" \"it must implement TargetLowering::AdjustInstrPostInstrSelection!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 294, __extension__ __PRETTY_FUNCTION__)) | |||
294 | "it must implement TargetLowering::AdjustInstrPostInstrSelection!")(static_cast <bool> (!MI.hasPostISelHook() && "If a target marks an instruction with 'hasPostISelHook', " "it must implement TargetLowering::AdjustInstrPostInstrSelection!" ) ? void (0) : __assert_fail ("!MI.hasPostISelHook() && \"If a target marks an instruction with 'hasPostISelHook', \" \"it must implement TargetLowering::AdjustInstrPostInstrSelection!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 294, __extension__ __PRETTY_FUNCTION__)); | |||
295 | } | |||
296 | ||||
297 | //===----------------------------------------------------------------------===// | |||
298 | // SelectionDAGISel code | |||
299 | //===----------------------------------------------------------------------===// | |||
300 | ||||
301 | SelectionDAGISel::SelectionDAGISel(TargetMachine &tm, | |||
302 | CodeGenOpt::Level OL) : | |||
303 | MachineFunctionPass(ID), TM(tm), | |||
304 | FuncInfo(new FunctionLoweringInfo()), | |||
305 | CurDAG(new SelectionDAG(tm, OL)), | |||
306 | SDB(new SelectionDAGBuilder(*CurDAG, *FuncInfo, OL)), | |||
307 | AA(), GFI(), | |||
308 | OptLevel(OL), | |||
309 | DAGSize(0) { | |||
310 | initializeGCModuleInfoPass(*PassRegistry::getPassRegistry()); | |||
311 | initializeBranchProbabilityInfoWrapperPassPass( | |||
312 | *PassRegistry::getPassRegistry()); | |||
313 | initializeAAResultsWrapperPassPass(*PassRegistry::getPassRegistry()); | |||
314 | initializeTargetLibraryInfoWrapperPassPass( | |||
315 | *PassRegistry::getPassRegistry()); | |||
316 | } | |||
317 | ||||
318 | SelectionDAGISel::~SelectionDAGISel() { | |||
319 | delete SDB; | |||
320 | delete CurDAG; | |||
321 | delete FuncInfo; | |||
322 | } | |||
323 | ||||
324 | void SelectionDAGISel::getAnalysisUsage(AnalysisUsage &AU) const { | |||
325 | if (OptLevel != CodeGenOpt::None) | |||
326 | AU.addRequired<AAResultsWrapperPass>(); | |||
327 | AU.addRequired<GCModuleInfo>(); | |||
328 | AU.addRequired<StackProtector>(); | |||
329 | AU.addPreserved<StackProtector>(); | |||
330 | AU.addPreserved<GCModuleInfo>(); | |||
331 | AU.addRequired<TargetLibraryInfoWrapperPass>(); | |||
332 | if (UseMBPI && OptLevel != CodeGenOpt::None) | |||
333 | AU.addRequired<BranchProbabilityInfoWrapperPass>(); | |||
334 | MachineFunctionPass::getAnalysisUsage(AU); | |||
335 | } | |||
336 | ||||
337 | /// SplitCriticalSideEffectEdges - Look for critical edges with a PHI value that | |||
338 | /// may trap on it. In this case we have to split the edge so that the path | |||
339 | /// through the predecessor block that doesn't go to the phi block doesn't | |||
340 | /// execute the possibly trapping instruction. If available, we pass domtree | |||
341 | /// and loop info to be updated when we split critical edges. This is because | |||
342 | /// SelectionDAGISel preserves these analyses. | |||
343 | /// This is required for correctness, so it must be done at -O0. | |||
344 | /// | |||
345 | static void SplitCriticalSideEffectEdges(Function &Fn, DominatorTree *DT, | |||
346 | LoopInfo *LI) { | |||
347 | // Loop for blocks with phi nodes. | |||
348 | for (BasicBlock &BB : Fn) { | |||
349 | PHINode *PN = dyn_cast<PHINode>(BB.begin()); | |||
350 | if (!PN) continue; | |||
351 | ||||
352 | ReprocessBlock: | |||
353 | // For each block with a PHI node, check to see if any of the input values | |||
354 | // are potentially trapping constant expressions. Constant expressions are | |||
355 | // the only potentially trapping value that can occur as the argument to a | |||
356 | // PHI. | |||
357 | for (BasicBlock::iterator I = BB.begin(); (PN = dyn_cast<PHINode>(I)); ++I) | |||
358 | for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) { | |||
359 | ConstantExpr *CE = dyn_cast<ConstantExpr>(PN->getIncomingValue(i)); | |||
360 | if (!CE || !CE->canTrap()) continue; | |||
361 | ||||
362 | // The only case we have to worry about is when the edge is critical. | |||
363 | // Since this block has a PHI Node, we assume it has multiple input | |||
364 | // edges: check to see if the pred has multiple successors. | |||
365 | BasicBlock *Pred = PN->getIncomingBlock(i); | |||
366 | if (Pred->getTerminator()->getNumSuccessors() == 1) | |||
367 | continue; | |||
368 | ||||
369 | // Okay, we have to split this edge. | |||
370 | SplitCriticalEdge( | |||
371 | Pred->getTerminator(), GetSuccessorNumber(Pred, &BB), | |||
372 | CriticalEdgeSplittingOptions(DT, LI).setMergeIdenticalEdges()); | |||
373 | goto ReprocessBlock; | |||
374 | } | |||
375 | } | |||
376 | } | |||
377 | ||||
378 | bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) { | |||
379 | // If we already selected that function, we do not need to run SDISel. | |||
380 | if (mf.getProperties().hasProperty( | |||
| ||||
381 | MachineFunctionProperties::Property::Selected)) | |||
382 | return false; | |||
383 | // Do some sanity-checking on the command-line options. | |||
384 | assert((!EnableFastISelAbort || TM.Options.EnableFastISel) &&(static_cast <bool> ((!EnableFastISelAbort || TM.Options .EnableFastISel) && "-fast-isel-abort > 0 requires -fast-isel" ) ? void (0) : __assert_fail ("(!EnableFastISelAbort || TM.Options.EnableFastISel) && \"-fast-isel-abort > 0 requires -fast-isel\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 385, __extension__ __PRETTY_FUNCTION__)) | |||
385 | "-fast-isel-abort > 0 requires -fast-isel")(static_cast <bool> ((!EnableFastISelAbort || TM.Options .EnableFastISel) && "-fast-isel-abort > 0 requires -fast-isel" ) ? void (0) : __assert_fail ("(!EnableFastISelAbort || TM.Options.EnableFastISel) && \"-fast-isel-abort > 0 requires -fast-isel\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 385, __extension__ __PRETTY_FUNCTION__)); | |||
386 | ||||
387 | const Function &Fn = mf.getFunction(); | |||
388 | MF = &mf; | |||
389 | ||||
390 | // Reset the target options before resetting the optimization | |||
391 | // level below. | |||
392 | // FIXME: This is a horrible hack and should be processed via | |||
393 | // codegen looking at the optimization level explicitly when | |||
394 | // it wants to look at it. | |||
395 | TM.resetTargetOptions(Fn); | |||
396 | // Reset OptLevel to None for optnone functions. | |||
397 | CodeGenOpt::Level NewOptLevel = OptLevel; | |||
398 | if (OptLevel != CodeGenOpt::None && skipFunction(Fn)) | |||
399 | NewOptLevel = CodeGenOpt::None; | |||
400 | OptLevelChanger OLC(*this, NewOptLevel); | |||
401 | ||||
402 | TII = MF->getSubtarget().getInstrInfo(); | |||
403 | TLI = MF->getSubtarget().getTargetLowering(); | |||
404 | RegInfo = &MF->getRegInfo(); | |||
405 | LibInfo = &getAnalysis<TargetLibraryInfoWrapperPass>().getTLI(); | |||
406 | GFI = Fn.hasGC() ? &getAnalysis<GCModuleInfo>().getFunctionInfo(Fn) : nullptr; | |||
407 | ORE = make_unique<OptimizationRemarkEmitter>(&Fn); | |||
408 | auto *DTWP = getAnalysisIfAvailable<DominatorTreeWrapperPass>(); | |||
409 | DominatorTree *DT = DTWP ? &DTWP->getDomTree() : nullptr; | |||
410 | auto *LIWP = getAnalysisIfAvailable<LoopInfoWrapperPass>(); | |||
411 | LoopInfo *LI = LIWP ? &LIWP->getLoopInfo() : nullptr; | |||
412 | ||||
413 | DEBUG(dbgs() << "\n\n\n=== " << Fn.getName() << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\n\n\n=== " << Fn.getName( ) << "\n"; } } while (false); | |||
414 | ||||
415 | SplitCriticalSideEffectEdges(const_cast<Function &>(Fn), DT, LI); | |||
416 | ||||
417 | CurDAG->init(*MF, *ORE, this, LibInfo); | |||
418 | FuncInfo->set(Fn, *MF, CurDAG); | |||
419 | ||||
420 | // Now get the optional analyzes if we want to. | |||
421 | // This is based on the possibly changed OptLevel (after optnone is taken | |||
422 | // into account). That's unfortunate but OK because it just means we won't | |||
423 | // ask for passes that have been required anyway. | |||
424 | ||||
425 | if (UseMBPI && OptLevel != CodeGenOpt::None) | |||
426 | FuncInfo->BPI = &getAnalysis<BranchProbabilityInfoWrapperPass>().getBPI(); | |||
427 | else | |||
428 | FuncInfo->BPI = nullptr; | |||
429 | ||||
430 | if (OptLevel != CodeGenOpt::None) | |||
431 | AA = &getAnalysis<AAResultsWrapperPass>().getAAResults(); | |||
432 | else | |||
433 | AA = nullptr; | |||
434 | ||||
435 | SDB->init(GFI, AA, LibInfo); | |||
436 | ||||
437 | MF->setHasInlineAsm(false); | |||
438 | ||||
439 | FuncInfo->SplitCSR = false; | |||
440 | ||||
441 | // We split CSR if the target supports it for the given function | |||
442 | // and the function has only return exits. | |||
443 | if (OptLevel != CodeGenOpt::None && TLI->supportSplitCSR(MF)) { | |||
444 | FuncInfo->SplitCSR = true; | |||
445 | ||||
446 | // Collect all the return blocks. | |||
447 | for (const BasicBlock &BB : Fn) { | |||
448 | if (!succ_empty(&BB)) | |||
449 | continue; | |||
450 | ||||
451 | const TerminatorInst *Term = BB.getTerminator(); | |||
452 | if (isa<UnreachableInst>(Term) || isa<ReturnInst>(Term)) | |||
453 | continue; | |||
454 | ||||
455 | // Bail out if the exit block is not Return nor Unreachable. | |||
456 | FuncInfo->SplitCSR = false; | |||
457 | break; | |||
458 | } | |||
459 | } | |||
460 | ||||
461 | MachineBasicBlock *EntryMBB = &MF->front(); | |||
462 | if (FuncInfo->SplitCSR) | |||
463 | // This performs initialization so lowering for SplitCSR will be correct. | |||
464 | TLI->initializeSplitCSR(EntryMBB); | |||
465 | ||||
466 | SelectAllBasicBlocks(Fn); | |||
467 | if (FastISelFailed && EnableFastISelFallbackReport) { | |||
468 | DiagnosticInfoISelFallback DiagFallback(Fn); | |||
469 | Fn.getContext().diagnose(DiagFallback); | |||
470 | } | |||
471 | ||||
472 | // If the first basic block in the function has live ins that need to be | |||
473 | // copied into vregs, emit the copies into the top of the block before | |||
474 | // emitting the code for the block. | |||
475 | const TargetRegisterInfo &TRI = *MF->getSubtarget().getRegisterInfo(); | |||
476 | RegInfo->EmitLiveInCopies(EntryMBB, TRI, *TII); | |||
477 | ||||
478 | // Insert copies in the entry block and the return blocks. | |||
479 | if (FuncInfo->SplitCSR) { | |||
480 | SmallVector<MachineBasicBlock*, 4> Returns; | |||
481 | // Collect all the return blocks. | |||
482 | for (MachineBasicBlock &MBB : mf) { | |||
483 | if (!MBB.succ_empty()) | |||
484 | continue; | |||
485 | ||||
486 | MachineBasicBlock::iterator Term = MBB.getFirstTerminator(); | |||
487 | if (Term != MBB.end() && Term->isReturn()) { | |||
488 | Returns.push_back(&MBB); | |||
489 | continue; | |||
490 | } | |||
491 | } | |||
492 | TLI->insertCopiesSplitCSR(EntryMBB, Returns); | |||
493 | } | |||
494 | ||||
495 | DenseMap<unsigned, unsigned> LiveInMap; | |||
496 | if (!FuncInfo->ArgDbgValues.empty()) | |||
497 | for (std::pair<unsigned, unsigned> LI : RegInfo->liveins()) | |||
498 | if (LI.second) | |||
499 | LiveInMap.insert(LI); | |||
500 | ||||
501 | // Insert DBG_VALUE instructions for function arguments to the entry block. | |||
502 | for (unsigned i = 0, e = FuncInfo->ArgDbgValues.size(); i != e; ++i) { | |||
503 | MachineInstr *MI = FuncInfo->ArgDbgValues[e-i-1]; | |||
504 | bool hasFI = MI->getOperand(0).isFI(); | |||
505 | unsigned Reg = | |||
506 | hasFI ? TRI.getFrameRegister(*MF) : MI->getOperand(0).getReg(); | |||
507 | if (TargetRegisterInfo::isPhysicalRegister(Reg)) | |||
508 | EntryMBB->insert(EntryMBB->begin(), MI); | |||
509 | else { | |||
510 | MachineInstr *Def = RegInfo->getVRegDef(Reg); | |||
511 | if (Def) { | |||
512 | MachineBasicBlock::iterator InsertPos = Def; | |||
513 | // FIXME: VR def may not be in entry block. | |||
514 | Def->getParent()->insert(std::next(InsertPos), MI); | |||
515 | } else | |||
516 | DEBUG(dbgs() << "Dropping debug info for dead vreg"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Dropping debug info for dead vreg" << TargetRegisterInfo::virtReg2Index(Reg) << "\n" ; } } while (false) | |||
517 | << TargetRegisterInfo::virtReg2Index(Reg) << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Dropping debug info for dead vreg" << TargetRegisterInfo::virtReg2Index(Reg) << "\n" ; } } while (false); | |||
518 | } | |||
519 | ||||
520 | // If Reg is live-in then update debug info to track its copy in a vreg. | |||
521 | DenseMap<unsigned, unsigned>::iterator LDI = LiveInMap.find(Reg); | |||
522 | if (LDI != LiveInMap.end()) { | |||
523 | assert(!hasFI && "There's no handling of frame pointer updating here yet "(static_cast <bool> (!hasFI && "There's no handling of frame pointer updating here yet " "- add if needed") ? void (0) : __assert_fail ("!hasFI && \"There's no handling of frame pointer updating here yet \" \"- add if needed\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 524, __extension__ __PRETTY_FUNCTION__)) | |||
524 | "- add if needed")(static_cast <bool> (!hasFI && "There's no handling of frame pointer updating here yet " "- add if needed") ? void (0) : __assert_fail ("!hasFI && \"There's no handling of frame pointer updating here yet \" \"- add if needed\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 524, __extension__ __PRETTY_FUNCTION__)); | |||
525 | MachineInstr *Def = RegInfo->getVRegDef(LDI->second); | |||
526 | MachineBasicBlock::iterator InsertPos = Def; | |||
527 | const MDNode *Variable = MI->getDebugVariable(); | |||
528 | const MDNode *Expr = MI->getDebugExpression(); | |||
529 | DebugLoc DL = MI->getDebugLoc(); | |||
530 | bool IsIndirect = MI->isIndirectDebugValue(); | |||
531 | if (IsIndirect) | |||
532 | assert(MI->getOperand(1).getImm() == 0 &&(static_cast <bool> (MI->getOperand(1).getImm() == 0 && "DBG_VALUE with nonzero offset") ? void (0) : __assert_fail ("MI->getOperand(1).getImm() == 0 && \"DBG_VALUE with nonzero offset\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 533, __extension__ __PRETTY_FUNCTION__)) | |||
533 | "DBG_VALUE with nonzero offset")(static_cast <bool> (MI->getOperand(1).getImm() == 0 && "DBG_VALUE with nonzero offset") ? void (0) : __assert_fail ("MI->getOperand(1).getImm() == 0 && \"DBG_VALUE with nonzero offset\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 533, __extension__ __PRETTY_FUNCTION__)); | |||
534 | assert(cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) &&(static_cast <bool> (cast<DILocalVariable>(Variable )->isValidLocationForIntrinsic(DL) && "Expected inlined-at fields to agree" ) ? void (0) : __assert_fail ("cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 535, __extension__ __PRETTY_FUNCTION__)) | |||
535 | "Expected inlined-at fields to agree")(static_cast <bool> (cast<DILocalVariable>(Variable )->isValidLocationForIntrinsic(DL) && "Expected inlined-at fields to agree" ) ? void (0) : __assert_fail ("cast<DILocalVariable>(Variable)->isValidLocationForIntrinsic(DL) && \"Expected inlined-at fields to agree\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 535, __extension__ __PRETTY_FUNCTION__)); | |||
536 | // Def is never a terminator here, so it is ok to increment InsertPos. | |||
537 | BuildMI(*EntryMBB, ++InsertPos, DL, TII->get(TargetOpcode::DBG_VALUE), | |||
538 | IsIndirect, LDI->second, Variable, Expr); | |||
539 | ||||
540 | // If this vreg is directly copied into an exported register then | |||
541 | // that COPY instructions also need DBG_VALUE, if it is the only | |||
542 | // user of LDI->second. | |||
543 | MachineInstr *CopyUseMI = nullptr; | |||
544 | for (MachineRegisterInfo::use_instr_iterator | |||
545 | UI = RegInfo->use_instr_begin(LDI->second), | |||
546 | E = RegInfo->use_instr_end(); UI != E; ) { | |||
547 | MachineInstr *UseMI = &*(UI++); | |||
548 | if (UseMI->isDebugValue()) continue; | |||
549 | if (UseMI->isCopy() && !CopyUseMI && UseMI->getParent() == EntryMBB) { | |||
550 | CopyUseMI = UseMI; continue; | |||
551 | } | |||
552 | // Otherwise this is another use or second copy use. | |||
553 | CopyUseMI = nullptr; break; | |||
554 | } | |||
555 | if (CopyUseMI) { | |||
556 | // Use MI's debug location, which describes where Variable was | |||
557 | // declared, rather than whatever is attached to CopyUseMI. | |||
558 | MachineInstr *NewMI = | |||
559 | BuildMI(*MF, DL, TII->get(TargetOpcode::DBG_VALUE), IsIndirect, | |||
560 | CopyUseMI->getOperand(0).getReg(), Variable, Expr); | |||
561 | MachineBasicBlock::iterator Pos = CopyUseMI; | |||
562 | EntryMBB->insertAfter(Pos, NewMI); | |||
563 | } | |||
564 | } | |||
565 | } | |||
566 | ||||
567 | // Determine if there are any calls in this machine function. | |||
568 | MachineFrameInfo &MFI = MF->getFrameInfo(); | |||
569 | for (const auto &MBB : *MF) { | |||
570 | if (MFI.hasCalls() && MF->hasInlineAsm()) | |||
571 | break; | |||
572 | ||||
573 | for (const auto &MI : MBB) { | |||
574 | const MCInstrDesc &MCID = TII->get(MI.getOpcode()); | |||
575 | if ((MCID.isCall() && !MCID.isReturn()) || | |||
576 | MI.isStackAligningInlineAsm()) { | |||
577 | MFI.setHasCalls(true); | |||
578 | } | |||
579 | if (MI.isInlineAsm()) { | |||
580 | MF->setHasInlineAsm(true); | |||
581 | } | |||
582 | } | |||
583 | } | |||
584 | ||||
585 | // Determine if there is a call to setjmp in the machine function. | |||
586 | MF->setExposesReturnsTwice(Fn.callsFunctionThatReturnsTwice()); | |||
587 | ||||
588 | // Replace forward-declared registers with the registers containing | |||
589 | // the desired value. | |||
590 | MachineRegisterInfo &MRI = MF->getRegInfo(); | |||
591 | for (DenseMap<unsigned, unsigned>::iterator | |||
592 | I = FuncInfo->RegFixups.begin(), E = FuncInfo->RegFixups.end(); | |||
593 | I != E; ++I) { | |||
594 | unsigned From = I->first; | |||
595 | unsigned To = I->second; | |||
596 | // If To is also scheduled to be replaced, find what its ultimate | |||
597 | // replacement is. | |||
598 | while (true) { | |||
599 | DenseMap<unsigned, unsigned>::iterator J = FuncInfo->RegFixups.find(To); | |||
600 | if (J == E) break; | |||
601 | To = J->second; | |||
602 | } | |||
603 | // Make sure the new register has a sufficiently constrained register class. | |||
604 | if (TargetRegisterInfo::isVirtualRegister(From) && | |||
605 | TargetRegisterInfo::isVirtualRegister(To)) | |||
606 | MRI.constrainRegClass(To, MRI.getRegClass(From)); | |||
607 | // Replace it. | |||
608 | ||||
609 | ||||
610 | // Replacing one register with another won't touch the kill flags. | |||
611 | // We need to conservatively clear the kill flags as a kill on the old | |||
612 | // register might dominate existing uses of the new register. | |||
613 | if (!MRI.use_empty(To)) | |||
614 | MRI.clearKillFlags(From); | |||
615 | MRI.replaceRegWith(From, To); | |||
616 | } | |||
617 | ||||
618 | TLI->finalizeLowering(*MF); | |||
619 | ||||
620 | // Release function-specific state. SDB and CurDAG are already cleared | |||
621 | // at this point. | |||
622 | FuncInfo->clear(); | |||
623 | ||||
624 | DEBUG(dbgs() << "*** MachineFunction at end of ISel ***\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "*** MachineFunction at end of ISel ***\n" ; } } while (false); | |||
625 | DEBUG(MF->print(dbgs()))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { MF->print(dbgs()); } } while (false); | |||
626 | ||||
627 | return true; | |||
628 | } | |||
629 | ||||
630 | static void reportFastISelFailure(MachineFunction &MF, | |||
631 | OptimizationRemarkEmitter &ORE, | |||
632 | OptimizationRemarkMissed &R, | |||
633 | bool ShouldAbort) { | |||
634 | // Print the function name explicitly if we don't have a debug location (which | |||
635 | // makes the diagnostic less useful) or if we're going to emit a raw error. | |||
636 | if (!R.getLocation().isValid() || ShouldAbort) | |||
637 | R << (" (in function: " + MF.getName() + ")").str(); | |||
638 | ||||
639 | if (ShouldAbort) | |||
640 | report_fatal_error(R.getMsg()); | |||
641 | ||||
642 | ORE.emit(R); | |||
643 | } | |||
644 | ||||
645 | void SelectionDAGISel::SelectBasicBlock(BasicBlock::const_iterator Begin, | |||
646 | BasicBlock::const_iterator End, | |||
647 | bool &HadTailCall) { | |||
648 | // Allow creating illegal types during DAG building for the basic block. | |||
649 | CurDAG->NewNodesMustHaveLegalTypes = false; | |||
650 | ||||
651 | // Lower the instructions. If a call is emitted as a tail call, cease emitting | |||
652 | // nodes for this block. | |||
653 | for (BasicBlock::const_iterator I = Begin; I != End && !SDB->HasTailCall; ++I) { | |||
654 | if (!ElidedArgCopyInstrs.count(&*I)) | |||
655 | SDB->visit(*I); | |||
656 | } | |||
657 | ||||
658 | // Make sure the root of the DAG is up-to-date. | |||
659 | CurDAG->setRoot(SDB->getControlRoot()); | |||
660 | HadTailCall = SDB->HasTailCall; | |||
661 | SDB->clear(); | |||
662 | ||||
663 | // Final step, emit the lowered DAG as machine code. | |||
664 | CodeGenAndEmitDAG(); | |||
665 | } | |||
666 | ||||
667 | void SelectionDAGISel::ComputeLiveOutVRegInfo() { | |||
668 | SmallPtrSet<SDNode*, 16> VisitedNodes; | |||
669 | SmallVector<SDNode*, 128> Worklist; | |||
670 | ||||
671 | Worklist.push_back(CurDAG->getRoot().getNode()); | |||
672 | ||||
673 | KnownBits Known; | |||
674 | ||||
675 | do { | |||
676 | SDNode *N = Worklist.pop_back_val(); | |||
677 | ||||
678 | // If we've already seen this node, ignore it. | |||
679 | if (!VisitedNodes.insert(N).second) | |||
680 | continue; | |||
681 | ||||
682 | // Otherwise, add all chain operands to the worklist. | |||
683 | for (const SDValue &Op : N->op_values()) | |||
684 | if (Op.getValueType() == MVT::Other) | |||
685 | Worklist.push_back(Op.getNode()); | |||
686 | ||||
687 | // If this is a CopyToReg with a vreg dest, process it. | |||
688 | if (N->getOpcode() != ISD::CopyToReg) | |||
689 | continue; | |||
690 | ||||
691 | unsigned DestReg = cast<RegisterSDNode>(N->getOperand(1))->getReg(); | |||
692 | if (!TargetRegisterInfo::isVirtualRegister(DestReg)) | |||
693 | continue; | |||
694 | ||||
695 | // Ignore non-scalar or non-integer values. | |||
696 | SDValue Src = N->getOperand(2); | |||
697 | EVT SrcVT = Src.getValueType(); | |||
698 | if (!SrcVT.isInteger() || SrcVT.isVector()) | |||
699 | continue; | |||
700 | ||||
701 | unsigned NumSignBits = CurDAG->ComputeNumSignBits(Src); | |||
702 | CurDAG->computeKnownBits(Src, Known); | |||
703 | FuncInfo->AddLiveOutRegInfo(DestReg, NumSignBits, Known); | |||
704 | } while (!Worklist.empty()); | |||
705 | } | |||
706 | ||||
707 | void SelectionDAGISel::CodeGenAndEmitDAG() { | |||
708 | StringRef GroupName = "sdag"; | |||
709 | StringRef GroupDescription = "Instruction Selection and Scheduling"; | |||
710 | std::string BlockName; | |||
711 | int BlockNumber = -1; | |||
712 | (void)BlockNumber; | |||
713 | bool MatchFilterBB = false; (void)MatchFilterBB; | |||
714 | ||||
715 | // Pre-type legalization allow creation of any node types. | |||
716 | CurDAG->NewNodesMustHaveLegalTypes = false; | |||
717 | ||||
718 | #ifndef NDEBUG | |||
719 | MatchFilterBB = (FilterDAGBasicBlockName.empty() || | |||
720 | FilterDAGBasicBlockName == | |||
721 | FuncInfo->MBB->getBasicBlock()->getName().str()); | |||
722 | #endif | |||
723 | #ifdef NDEBUG | |||
724 | if (ViewDAGCombine1 || ViewLegalizeTypesDAGs || ViewLegalizeDAGs || | |||
725 | ViewDAGCombine2 || ViewDAGCombineLT || ViewISelDAGs || ViewSchedDAGs || | |||
726 | ViewSUnitDAGs) | |||
727 | #endif | |||
728 | { | |||
729 | BlockNumber = FuncInfo->MBB->getNumber(); | |||
730 | BlockName = | |||
731 | (MF->getName() + ":" + FuncInfo->MBB->getBasicBlock()->getName()).str(); | |||
732 | } | |||
733 | DEBUG(dbgs() << "Initial selection DAG: " << printMBBReference(*FuncInfo->MBB)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Initial selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
734 | << " '" << BlockName << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Initial selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
735 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Initial selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false); | |||
736 | ||||
737 | if (ViewDAGCombine1 && MatchFilterBB) | |||
738 | CurDAG->viewGraph("dag-combine1 input for " + BlockName); | |||
739 | ||||
740 | // Run the DAG combiner in pre-legalize mode. | |||
741 | { | |||
742 | NamedRegionTimer T("combine1", "DAG Combining 1", GroupName, | |||
743 | GroupDescription, TimePassesIsEnabled); | |||
744 | CurDAG->Combine(BeforeLegalizeTypes, AA, OptLevel); | |||
745 | } | |||
746 | ||||
747 | DEBUG(dbgs() << "Optimized lowered selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized lowered selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
748 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized lowered selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
749 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized lowered selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
750 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized lowered selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ); | |||
751 | ||||
752 | // Second step, hack on the DAG until it only uses operations and types that | |||
753 | // the target supports. | |||
754 | if (ViewLegalizeTypesDAGs && MatchFilterBB) | |||
755 | CurDAG->viewGraph("legalize-types input for " + BlockName); | |||
756 | ||||
757 | bool Changed; | |||
758 | { | |||
759 | NamedRegionTimer T("legalize_types", "Type Legalization", GroupName, | |||
760 | GroupDescription, TimePassesIsEnabled); | |||
761 | Changed = CurDAG->LegalizeTypes(); | |||
762 | } | |||
763 | ||||
764 | DEBUG(dbgs() << "Type-legalized selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
765 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
766 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
767 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false); | |||
768 | ||||
769 | // Only allow creation of legal node types. | |||
770 | CurDAG->NewNodesMustHaveLegalTypes = true; | |||
771 | ||||
772 | if (Changed) { | |||
773 | if (ViewDAGCombineLT && MatchFilterBB) | |||
774 | CurDAG->viewGraph("dag-combine-lt input for " + BlockName); | |||
775 | ||||
776 | // Run the DAG combiner in post-type-legalize mode. | |||
777 | { | |||
778 | NamedRegionTimer T("combine_lt", "DAG Combining after legalize types", | |||
779 | GroupName, GroupDescription, TimePassesIsEnabled); | |||
780 | CurDAG->Combine(AfterLegalizeTypes, AA, OptLevel); | |||
781 | } | |||
782 | ||||
783 | DEBUG(dbgs() << "Optimized type-legalized selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
784 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
785 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
786 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ); | |||
787 | } | |||
788 | ||||
789 | { | |||
790 | NamedRegionTimer T("legalize_vec", "Vector Legalization", GroupName, | |||
791 | GroupDescription, TimePassesIsEnabled); | |||
792 | Changed = CurDAG->LegalizeVectors(); | |||
793 | } | |||
794 | ||||
795 | if (Changed) { | |||
796 | DEBUG(dbgs() << "Vector-legalized selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Vector-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
797 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Vector-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
798 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Vector-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
799 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Vector-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ); | |||
800 | ||||
801 | { | |||
802 | NamedRegionTimer T("legalize_types2", "Type Legalization 2", GroupName, | |||
803 | GroupDescription, TimePassesIsEnabled); | |||
804 | CurDAG->LegalizeTypes(); | |||
805 | } | |||
806 | ||||
807 | DEBUG(dbgs() << "Vector/type-legalized selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Vector/type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
808 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Vector/type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
809 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Vector/type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
810 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Vector/type-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ); | |||
811 | ||||
812 | if (ViewDAGCombineLT && MatchFilterBB) | |||
813 | CurDAG->viewGraph("dag-combine-lv input for " + BlockName); | |||
814 | ||||
815 | // Run the DAG combiner in post-type-legalize mode. | |||
816 | { | |||
817 | NamedRegionTimer T("combine_lv", "DAG Combining after legalize vectors", | |||
818 | GroupName, GroupDescription, TimePassesIsEnabled); | |||
819 | CurDAG->Combine(AfterLegalizeVectorOps, AA, OptLevel); | |||
820 | } | |||
821 | ||||
822 | DEBUG(dbgs() << "Optimized vector-legalized selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized vector-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
823 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized vector-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
824 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized vector-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
825 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized vector-legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ); | |||
826 | } | |||
827 | ||||
828 | if (ViewLegalizeDAGs && MatchFilterBB) | |||
829 | CurDAG->viewGraph("legalize input for " + BlockName); | |||
830 | ||||
831 | { | |||
832 | NamedRegionTimer T("legalize", "DAG Legalization", GroupName, | |||
833 | GroupDescription, TimePassesIsEnabled); | |||
834 | CurDAG->Legalize(); | |||
835 | } | |||
836 | ||||
837 | DEBUG(dbgs() << "Legalized selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
838 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
839 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
840 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false); | |||
841 | ||||
842 | if (ViewDAGCombine2 && MatchFilterBB) | |||
843 | CurDAG->viewGraph("dag-combine2 input for " + BlockName); | |||
844 | ||||
845 | // Run the DAG combiner in post-legalize mode. | |||
846 | { | |||
847 | NamedRegionTimer T("combine2", "DAG Combining 2", GroupName, | |||
848 | GroupDescription, TimePassesIsEnabled); | |||
849 | CurDAG->Combine(AfterLegalizeDAG, AA, OptLevel); | |||
850 | } | |||
851 | ||||
852 | DEBUG(dbgs() << "Optimized legalized selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
853 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
854 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ) | |||
855 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Optimized legalized selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false ); | |||
856 | ||||
857 | if (OptLevel != CodeGenOpt::None) | |||
858 | ComputeLiveOutVRegInfo(); | |||
859 | ||||
860 | if (ViewISelDAGs && MatchFilterBB) | |||
861 | CurDAG->viewGraph("isel input for " + BlockName); | |||
862 | ||||
863 | // Third, instruction select all of the operations to machine code, adding the | |||
864 | // code to the MachineBasicBlock. | |||
865 | { | |||
866 | NamedRegionTimer T("isel", "Instruction Selection", GroupName, | |||
867 | GroupDescription, TimePassesIsEnabled); | |||
868 | DoInstructionSelection(); | |||
869 | } | |||
870 | ||||
871 | DEBUG(dbgs() << "Selected selection DAG: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Selected selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
872 | << printMBBReference(*FuncInfo->MBB) << " '" << BlockNamedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Selected selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
873 | << "'\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Selected selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false) | |||
874 | CurDAG->dump())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Selected selection DAG: " << printMBBReference(*FuncInfo->MBB) << " '" << BlockName << "'\n"; CurDAG->dump(); } } while (false); | |||
875 | ||||
876 | if (ViewSchedDAGs && MatchFilterBB) | |||
877 | CurDAG->viewGraph("scheduler input for " + BlockName); | |||
878 | ||||
879 | // Schedule machine code. | |||
880 | ScheduleDAGSDNodes *Scheduler = CreateScheduler(); | |||
881 | { | |||
882 | NamedRegionTimer T("sched", "Instruction Scheduling", GroupName, | |||
883 | GroupDescription, TimePassesIsEnabled); | |||
884 | Scheduler->Run(CurDAG, FuncInfo->MBB); | |||
885 | } | |||
886 | ||||
887 | if (ViewSUnitDAGs && MatchFilterBB) | |||
888 | Scheduler->viewGraph(); | |||
889 | ||||
890 | // Emit machine code to BB. This can change 'BB' to the last block being | |||
891 | // inserted into. | |||
892 | MachineBasicBlock *FirstMBB = FuncInfo->MBB, *LastMBB; | |||
893 | { | |||
894 | NamedRegionTimer T("emit", "Instruction Creation", GroupName, | |||
895 | GroupDescription, TimePassesIsEnabled); | |||
896 | ||||
897 | // FuncInfo->InsertPt is passed by reference and set to the end of the | |||
898 | // scheduled instructions. | |||
899 | LastMBB = FuncInfo->MBB = Scheduler->EmitSchedule(FuncInfo->InsertPt); | |||
900 | } | |||
901 | ||||
902 | // If the block was split, make sure we update any references that are used to | |||
903 | // update PHI nodes later on. | |||
904 | if (FirstMBB != LastMBB) | |||
905 | SDB->UpdateSplitBlock(FirstMBB, LastMBB); | |||
906 | ||||
907 | // Free the scheduler state. | |||
908 | { | |||
909 | NamedRegionTimer T("cleanup", "Instruction Scheduling Cleanup", GroupName, | |||
910 | GroupDescription, TimePassesIsEnabled); | |||
911 | delete Scheduler; | |||
912 | } | |||
913 | ||||
914 | // Free the SelectionDAG state, now that we're finished with it. | |||
915 | CurDAG->clear(); | |||
916 | } | |||
917 | ||||
918 | namespace { | |||
919 | ||||
920 | /// ISelUpdater - helper class to handle updates of the instruction selection | |||
921 | /// graph. | |||
922 | class ISelUpdater : public SelectionDAG::DAGUpdateListener { | |||
923 | SelectionDAG::allnodes_iterator &ISelPosition; | |||
924 | ||||
925 | public: | |||
926 | ISelUpdater(SelectionDAG &DAG, SelectionDAG::allnodes_iterator &isp) | |||
927 | : SelectionDAG::DAGUpdateListener(DAG), ISelPosition(isp) {} | |||
928 | ||||
929 | /// NodeDeleted - Handle nodes deleted from the graph. If the node being | |||
930 | /// deleted is the current ISelPosition node, update ISelPosition. | |||
931 | /// | |||
932 | void NodeDeleted(SDNode *N, SDNode *E) override { | |||
933 | if (ISelPosition == SelectionDAG::allnodes_iterator(N)) | |||
934 | ++ISelPosition; | |||
935 | } | |||
936 | }; | |||
937 | ||||
938 | } // end anonymous namespace | |||
939 | ||||
940 | void SelectionDAGISel::DoInstructionSelection() { | |||
941 | DEBUG(dbgs() << "===== Instruction selection begins: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "===== Instruction selection begins: " << printMBBReference(*FuncInfo->MBB) << " '" << FuncInfo->MBB->getName() << "'\n"; } } while (false ) | |||
942 | << printMBBReference(*FuncInfo->MBB) << " '"do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "===== Instruction selection begins: " << printMBBReference(*FuncInfo->MBB) << " '" << FuncInfo->MBB->getName() << "'\n"; } } while (false ) | |||
943 | << FuncInfo->MBB->getName() << "'\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "===== Instruction selection begins: " << printMBBReference(*FuncInfo->MBB) << " '" << FuncInfo->MBB->getName() << "'\n"; } } while (false ); | |||
944 | ||||
945 | PreprocessISelDAG(); | |||
946 | ||||
947 | // Select target instructions for the DAG. | |||
948 | { | |||
949 | // Number all nodes with a topological order and set DAGSize. | |||
950 | DAGSize = CurDAG->AssignTopologicalOrder(); | |||
951 | ||||
952 | // Create a dummy node (which is not added to allnodes), that adds | |||
953 | // a reference to the root node, preventing it from being deleted, | |||
954 | // and tracking any changes of the root. | |||
955 | HandleSDNode Dummy(CurDAG->getRoot()); | |||
956 | SelectionDAG::allnodes_iterator ISelPosition (CurDAG->getRoot().getNode()); | |||
957 | ++ISelPosition; | |||
958 | ||||
959 | // Make sure that ISelPosition gets properly updated when nodes are deleted | |||
960 | // in calls made from this function. | |||
961 | ISelUpdater ISU(*CurDAG, ISelPosition); | |||
962 | ||||
963 | // The AllNodes list is now topological-sorted. Visit the | |||
964 | // nodes by starting at the end of the list (the root of the | |||
965 | // graph) and preceding back toward the beginning (the entry | |||
966 | // node). | |||
967 | while (ISelPosition != CurDAG->allnodes_begin()) { | |||
968 | SDNode *Node = &*--ISelPosition; | |||
969 | // Skip dead nodes. DAGCombiner is expected to eliminate all dead nodes, | |||
970 | // but there are currently some corner cases that it misses. Also, this | |||
971 | // makes it theoretically possible to disable the DAGCombiner. | |||
972 | if (Node->use_empty()) | |||
973 | continue; | |||
974 | ||||
975 | // When we are using non-default rounding modes or FP exception behavior | |||
976 | // FP operations are represented by StrictFP pseudo-operations. They | |||
977 | // need to be simplified here so that the target-specific instruction | |||
978 | // selectors know how to handle them. | |||
979 | // | |||
980 | // If the current node is a strict FP pseudo-op, the isStrictFPOp() | |||
981 | // function will provide the corresponding normal FP opcode to which the | |||
982 | // node should be mutated. | |||
983 | // | |||
984 | // FIXME: The backends need a way to handle FP constraints. | |||
985 | if (Node->isStrictFPOpcode()) | |||
986 | Node = CurDAG->mutateStrictFPToFP(Node); | |||
987 | ||||
988 | DEBUG(dbgs() << "\nISEL: Starting selection on root node: ";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\nISEL: Starting selection on root node: " ; Node->dump(CurDAG); } } while (false) | |||
989 | Node->dump(CurDAG))do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\nISEL: Starting selection on root node: " ; Node->dump(CurDAG); } } while (false); | |||
990 | ||||
991 | Select(Node); | |||
992 | } | |||
993 | ||||
994 | CurDAG->setRoot(Dummy.getValue()); | |||
995 | } | |||
996 | ||||
997 | DEBUG(dbgs() << "\n===== Instruction selection ends:\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "\n===== Instruction selection ends:\n" ; } } while (false); | |||
998 | ||||
999 | PostprocessISelDAG(); | |||
1000 | } | |||
1001 | ||||
1002 | static bool hasExceptionPointerOrCodeUser(const CatchPadInst *CPI) { | |||
1003 | for (const User *U : CPI->users()) { | |||
1004 | if (const IntrinsicInst *EHPtrCall = dyn_cast<IntrinsicInst>(U)) { | |||
1005 | Intrinsic::ID IID = EHPtrCall->getIntrinsicID(); | |||
1006 | if (IID == Intrinsic::eh_exceptionpointer || | |||
1007 | IID == Intrinsic::eh_exceptioncode) | |||
1008 | return true; | |||
1009 | } | |||
1010 | } | |||
1011 | return false; | |||
1012 | } | |||
1013 | ||||
1014 | /// PrepareEHLandingPad - Emit an EH_LABEL, set up live-in registers, and | |||
1015 | /// do other setup for EH landing-pad blocks. | |||
1016 | bool SelectionDAGISel::PrepareEHLandingPad() { | |||
1017 | MachineBasicBlock *MBB = FuncInfo->MBB; | |||
1018 | const Constant *PersonalityFn = FuncInfo->Fn->getPersonalityFn(); | |||
1019 | const BasicBlock *LLVMBB = MBB->getBasicBlock(); | |||
1020 | const TargetRegisterClass *PtrRC = | |||
1021 | TLI->getRegClassFor(TLI->getPointerTy(CurDAG->getDataLayout())); | |||
1022 | ||||
1023 | // Catchpads have one live-in register, which typically holds the exception | |||
1024 | // pointer or code. | |||
1025 | if (const auto *CPI = dyn_cast<CatchPadInst>(LLVMBB->getFirstNonPHI())) { | |||
1026 | if (hasExceptionPointerOrCodeUser(CPI)) { | |||
1027 | // Get or create the virtual register to hold the pointer or code. Mark | |||
1028 | // the live in physreg and copy into the vreg. | |||
1029 | MCPhysReg EHPhysReg = TLI->getExceptionPointerRegister(PersonalityFn); | |||
1030 | assert(EHPhysReg && "target lacks exception pointer register")(static_cast <bool> (EHPhysReg && "target lacks exception pointer register" ) ? void (0) : __assert_fail ("EHPhysReg && \"target lacks exception pointer register\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1030, __extension__ __PRETTY_FUNCTION__)); | |||
1031 | MBB->addLiveIn(EHPhysReg); | |||
1032 | unsigned VReg = FuncInfo->getCatchPadExceptionPointerVReg(CPI, PtrRC); | |||
1033 | BuildMI(*MBB, FuncInfo->InsertPt, SDB->getCurDebugLoc(), | |||
1034 | TII->get(TargetOpcode::COPY), VReg) | |||
1035 | .addReg(EHPhysReg, RegState::Kill); | |||
1036 | } | |||
1037 | return true; | |||
1038 | } | |||
1039 | ||||
1040 | if (!LLVMBB->isLandingPad()) | |||
1041 | return true; | |||
1042 | ||||
1043 | // Add a label to mark the beginning of the landing pad. Deletion of the | |||
1044 | // landing pad can thus be detected via the MachineModuleInfo. | |||
1045 | MCSymbol *Label = MF->addLandingPad(MBB); | |||
1046 | ||||
1047 | // Assign the call site to the landing pad's begin label. | |||
1048 | MF->setCallSiteLandingPad(Label, SDB->LPadToCallSiteMap[MBB]); | |||
1049 | ||||
1050 | const MCInstrDesc &II = TII->get(TargetOpcode::EH_LABEL); | |||
1051 | BuildMI(*MBB, FuncInfo->InsertPt, SDB->getCurDebugLoc(), II) | |||
1052 | .addSym(Label); | |||
1053 | ||||
1054 | // Mark exception register as live in. | |||
1055 | if (unsigned Reg = TLI->getExceptionPointerRegister(PersonalityFn)) | |||
1056 | FuncInfo->ExceptionPointerVirtReg = MBB->addLiveIn(Reg, PtrRC); | |||
1057 | ||||
1058 | // Mark exception selector register as live in. | |||
1059 | if (unsigned Reg = TLI->getExceptionSelectorRegister(PersonalityFn)) | |||
1060 | FuncInfo->ExceptionSelectorVirtReg = MBB->addLiveIn(Reg, PtrRC); | |||
1061 | ||||
1062 | return true; | |||
1063 | } | |||
1064 | ||||
1065 | /// isFoldedOrDeadInstruction - Return true if the specified instruction is | |||
1066 | /// side-effect free and is either dead or folded into a generated instruction. | |||
1067 | /// Return false if it needs to be emitted. | |||
1068 | static bool isFoldedOrDeadInstruction(const Instruction *I, | |||
1069 | FunctionLoweringInfo *FuncInfo) { | |||
1070 | return !I->mayWriteToMemory() && // Side-effecting instructions aren't folded. | |||
1071 | !isa<TerminatorInst>(I) && // Terminators aren't folded. | |||
1072 | !isa<DbgInfoIntrinsic>(I) && // Debug instructions aren't folded. | |||
1073 | !I->isEHPad() && // EH pad instructions aren't folded. | |||
1074 | !FuncInfo->isExportedInst(I); // Exported instrs must be computed. | |||
1075 | } | |||
1076 | ||||
1077 | /// Set up SwiftErrorVals by going through the function. If the function has | |||
1078 | /// swifterror argument, it will be the first entry. | |||
1079 | static void setupSwiftErrorVals(const Function &Fn, const TargetLowering *TLI, | |||
1080 | FunctionLoweringInfo *FuncInfo) { | |||
1081 | if (!TLI->supportSwiftError()) | |||
1082 | return; | |||
1083 | ||||
1084 | FuncInfo->SwiftErrorVals.clear(); | |||
1085 | FuncInfo->SwiftErrorVRegDefMap.clear(); | |||
1086 | FuncInfo->SwiftErrorVRegUpwardsUse.clear(); | |||
1087 | FuncInfo->SwiftErrorVRegDefUses.clear(); | |||
1088 | FuncInfo->SwiftErrorArg = nullptr; | |||
1089 | ||||
1090 | // Check if function has a swifterror argument. | |||
1091 | bool HaveSeenSwiftErrorArg = false; | |||
1092 | for (Function::const_arg_iterator AI = Fn.arg_begin(), AE = Fn.arg_end(); | |||
1093 | AI != AE; ++AI) | |||
1094 | if (AI->hasSwiftErrorAttr()) { | |||
1095 | assert(!HaveSeenSwiftErrorArg &&(static_cast <bool> (!HaveSeenSwiftErrorArg && "Must have only one swifterror parameter" ) ? void (0) : __assert_fail ("!HaveSeenSwiftErrorArg && \"Must have only one swifterror parameter\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1096, __extension__ __PRETTY_FUNCTION__)) | |||
1096 | "Must have only one swifterror parameter")(static_cast <bool> (!HaveSeenSwiftErrorArg && "Must have only one swifterror parameter" ) ? void (0) : __assert_fail ("!HaveSeenSwiftErrorArg && \"Must have only one swifterror parameter\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1096, __extension__ __PRETTY_FUNCTION__)); | |||
1097 | (void)HaveSeenSwiftErrorArg; // silence warning. | |||
1098 | HaveSeenSwiftErrorArg = true; | |||
1099 | FuncInfo->SwiftErrorArg = &*AI; | |||
1100 | FuncInfo->SwiftErrorVals.push_back(&*AI); | |||
1101 | } | |||
1102 | ||||
1103 | for (const auto &LLVMBB : Fn) | |||
1104 | for (const auto &Inst : LLVMBB) { | |||
1105 | if (const AllocaInst *Alloca = dyn_cast<AllocaInst>(&Inst)) | |||
1106 | if (Alloca->isSwiftError()) | |||
1107 | FuncInfo->SwiftErrorVals.push_back(Alloca); | |||
1108 | } | |||
1109 | } | |||
1110 | ||||
1111 | static void createSwiftErrorEntriesInEntryBlock(FunctionLoweringInfo *FuncInfo, | |||
1112 | FastISel *FastIS, | |||
1113 | const TargetLowering *TLI, | |||
1114 | const TargetInstrInfo *TII, | |||
1115 | SelectionDAGBuilder *SDB) { | |||
1116 | if (!TLI->supportSwiftError()) | |||
1117 | return; | |||
1118 | ||||
1119 | // We only need to do this when we have swifterror parameter or swifterror | |||
1120 | // alloc. | |||
1121 | if (FuncInfo->SwiftErrorVals.empty()) | |||
1122 | return; | |||
1123 | ||||
1124 | assert(FuncInfo->MBB == &*FuncInfo->MF->begin() &&(static_cast <bool> (FuncInfo->MBB == &*FuncInfo ->MF->begin() && "expected to insert into entry block" ) ? void (0) : __assert_fail ("FuncInfo->MBB == &*FuncInfo->MF->begin() && \"expected to insert into entry block\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1125, __extension__ __PRETTY_FUNCTION__)) | |||
1125 | "expected to insert into entry block")(static_cast <bool> (FuncInfo->MBB == &*FuncInfo ->MF->begin() && "expected to insert into entry block" ) ? void (0) : __assert_fail ("FuncInfo->MBB == &*FuncInfo->MF->begin() && \"expected to insert into entry block\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1125, __extension__ __PRETTY_FUNCTION__)); | |||
1126 | auto &DL = FuncInfo->MF->getDataLayout(); | |||
1127 | auto const *RC = TLI->getRegClassFor(TLI->getPointerTy(DL)); | |||
1128 | for (const auto *SwiftErrorVal : FuncInfo->SwiftErrorVals) { | |||
1129 | // We will always generate a copy from the argument. It is always used at | |||
1130 | // least by the 'return' of the swifterror. | |||
1131 | if (FuncInfo->SwiftErrorArg && FuncInfo->SwiftErrorArg == SwiftErrorVal) | |||
1132 | continue; | |||
1133 | unsigned VReg = FuncInfo->MF->getRegInfo().createVirtualRegister(RC); | |||
1134 | // Assign Undef to Vreg. We construct MI directly to make sure it works | |||
1135 | // with FastISel. | |||
1136 | BuildMI(*FuncInfo->MBB, FuncInfo->MBB->getFirstNonPHI(), | |||
1137 | SDB->getCurDebugLoc(), TII->get(TargetOpcode::IMPLICIT_DEF), | |||
1138 | VReg); | |||
1139 | ||||
1140 | // Keep FastIS informed about the value we just inserted. | |||
1141 | if (FastIS) | |||
1142 | FastIS->setLastLocalValue(&*std::prev(FuncInfo->InsertPt)); | |||
1143 | ||||
1144 | FuncInfo->setCurrentSwiftErrorVReg(FuncInfo->MBB, SwiftErrorVal, VReg); | |||
1145 | } | |||
1146 | } | |||
1147 | ||||
1148 | /// Collect llvm.dbg.declare information. This is done after argument lowering | |||
1149 | /// in case the declarations refer to arguments. | |||
1150 | static void processDbgDeclares(FunctionLoweringInfo *FuncInfo) { | |||
1151 | MachineFunction *MF = FuncInfo->MF; | |||
1152 | const DataLayout &DL = MF->getDataLayout(); | |||
1153 | for (const BasicBlock &BB : *FuncInfo->Fn) { | |||
1154 | for (const Instruction &I : BB) { | |||
1155 | const DbgDeclareInst *DI = dyn_cast<DbgDeclareInst>(&I); | |||
1156 | if (!DI) | |||
1157 | continue; | |||
1158 | ||||
1159 | assert(DI->getVariable() && "Missing variable")(static_cast <bool> (DI->getVariable() && "Missing variable" ) ? void (0) : __assert_fail ("DI->getVariable() && \"Missing variable\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1159, __extension__ __PRETTY_FUNCTION__)); | |||
1160 | assert(DI->getDebugLoc() && "Missing location")(static_cast <bool> (DI->getDebugLoc() && "Missing location" ) ? void (0) : __assert_fail ("DI->getDebugLoc() && \"Missing location\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1160, __extension__ __PRETTY_FUNCTION__)); | |||
1161 | const Value *Address = DI->getAddress(); | |||
1162 | if (!Address) | |||
1163 | continue; | |||
1164 | ||||
1165 | // Look through casts and constant offset GEPs. These mostly come from | |||
1166 | // inalloca. | |||
1167 | APInt Offset(DL.getTypeSizeInBits(Address->getType()), 0); | |||
1168 | Address = Address->stripAndAccumulateInBoundsConstantOffsets(DL, Offset); | |||
1169 | ||||
1170 | // Check if the variable is a static alloca or a byval or inalloca | |||
1171 | // argument passed in memory. If it is not, then we will ignore this | |||
1172 | // intrinsic and handle this during isel like dbg.value. | |||
1173 | int FI = std::numeric_limits<int>::max(); | |||
1174 | if (const auto *AI = dyn_cast<AllocaInst>(Address)) { | |||
1175 | auto SI = FuncInfo->StaticAllocaMap.find(AI); | |||
1176 | if (SI != FuncInfo->StaticAllocaMap.end()) | |||
1177 | FI = SI->second; | |||
1178 | } else if (const auto *Arg = dyn_cast<Argument>(Address)) | |||
1179 | FI = FuncInfo->getArgumentFrameIndex(Arg); | |||
1180 | ||||
1181 | if (FI == std::numeric_limits<int>::max()) | |||
1182 | continue; | |||
1183 | ||||
1184 | DIExpression *Expr = DI->getExpression(); | |||
1185 | if (Offset.getBoolValue()) | |||
1186 | Expr = DIExpression::prepend(Expr, DIExpression::NoDeref, | |||
1187 | Offset.getZExtValue()); | |||
1188 | MF->setVariableDbgInfo(DI->getVariable(), Expr, FI, DI->getDebugLoc()); | |||
1189 | } | |||
1190 | } | |||
1191 | } | |||
1192 | ||||
1193 | /// Propagate swifterror values through the machine function CFG. | |||
1194 | static void propagateSwiftErrorVRegs(FunctionLoweringInfo *FuncInfo) { | |||
1195 | auto *TLI = FuncInfo->TLI; | |||
1196 | if (!TLI->supportSwiftError()) | |||
1197 | return; | |||
1198 | ||||
1199 | // We only need to do this when we have swifterror parameter or swifterror | |||
1200 | // alloc. | |||
1201 | if (FuncInfo->SwiftErrorVals.empty()) | |||
1202 | return; | |||
1203 | ||||
1204 | // For each machine basic block in reverse post order. | |||
1205 | ReversePostOrderTraversal<MachineFunction *> RPOT(FuncInfo->MF); | |||
1206 | for (MachineBasicBlock *MBB : RPOT) { | |||
1207 | // For each swifterror value in the function. | |||
1208 | for(const auto *SwiftErrorVal : FuncInfo->SwiftErrorVals) { | |||
1209 | auto Key = std::make_pair(MBB, SwiftErrorVal); | |||
1210 | auto UUseIt = FuncInfo->SwiftErrorVRegUpwardsUse.find(Key); | |||
1211 | auto VRegDefIt = FuncInfo->SwiftErrorVRegDefMap.find(Key); | |||
1212 | bool UpwardsUse = UUseIt != FuncInfo->SwiftErrorVRegUpwardsUse.end(); | |||
1213 | unsigned UUseVReg = UpwardsUse ? UUseIt->second : 0; | |||
1214 | bool DownwardDef = VRegDefIt != FuncInfo->SwiftErrorVRegDefMap.end(); | |||
1215 | assert(!(UpwardsUse && !DownwardDef) &&(static_cast <bool> (!(UpwardsUse && !DownwardDef ) && "We can't have an upwards use but no downwards def" ) ? void (0) : __assert_fail ("!(UpwardsUse && !DownwardDef) && \"We can't have an upwards use but no downwards def\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1216, __extension__ __PRETTY_FUNCTION__)) | |||
1216 | "We can't have an upwards use but no downwards def")(static_cast <bool> (!(UpwardsUse && !DownwardDef ) && "We can't have an upwards use but no downwards def" ) ? void (0) : __assert_fail ("!(UpwardsUse && !DownwardDef) && \"We can't have an upwards use but no downwards def\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1216, __extension__ __PRETTY_FUNCTION__)); | |||
1217 | ||||
1218 | // If there is no upwards exposed use and an entry for the swifterror in | |||
1219 | // the def map for this value we don't need to do anything: We already | |||
1220 | // have a downward def for this basic block. | |||
1221 | if (!UpwardsUse && DownwardDef) | |||
1222 | continue; | |||
1223 | ||||
1224 | // Otherwise we either have an upwards exposed use vreg that we need to | |||
1225 | // materialize or need to forward the downward def from predecessors. | |||
1226 | ||||
1227 | // Check whether we have a single vreg def from all predecessors. | |||
1228 | // Otherwise we need a phi. | |||
1229 | SmallVector<std::pair<MachineBasicBlock *, unsigned>, 4> VRegs; | |||
1230 | SmallSet<const MachineBasicBlock*, 8> Visited; | |||
1231 | for (auto *Pred : MBB->predecessors()) { | |||
1232 | if (!Visited.insert(Pred).second) | |||
1233 | continue; | |||
1234 | VRegs.push_back(std::make_pair( | |||
1235 | Pred, FuncInfo->getOrCreateSwiftErrorVReg(Pred, SwiftErrorVal))); | |||
1236 | if (Pred != MBB) | |||
1237 | continue; | |||
1238 | // We have a self-edge. | |||
1239 | // If there was no upwards use in this basic block there is now one: the | |||
1240 | // phi needs to use it self. | |||
1241 | if (!UpwardsUse) { | |||
1242 | UpwardsUse = true; | |||
1243 | UUseIt = FuncInfo->SwiftErrorVRegUpwardsUse.find(Key); | |||
1244 | assert(UUseIt != FuncInfo->SwiftErrorVRegUpwardsUse.end())(static_cast <bool> (UUseIt != FuncInfo->SwiftErrorVRegUpwardsUse .end()) ? void (0) : __assert_fail ("UUseIt != FuncInfo->SwiftErrorVRegUpwardsUse.end()" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1244, __extension__ __PRETTY_FUNCTION__)); | |||
1245 | UUseVReg = UUseIt->second; | |||
1246 | } | |||
1247 | } | |||
1248 | ||||
1249 | // We need a phi node if we have more than one predecessor with different | |||
1250 | // downward defs. | |||
1251 | bool needPHI = | |||
1252 | VRegs.size() >= 1 && | |||
1253 | std::find_if( | |||
1254 | VRegs.begin(), VRegs.end(), | |||
1255 | [&](const std::pair<const MachineBasicBlock *, unsigned> &V) | |||
1256 | -> bool { return V.second != VRegs[0].second; }) != | |||
1257 | VRegs.end(); | |||
1258 | ||||
1259 | // If there is no upwards exposed used and we don't need a phi just | |||
1260 | // forward the swifterror vreg from the predecessor(s). | |||
1261 | if (!UpwardsUse && !needPHI) { | |||
1262 | assert(!VRegs.empty() &&(static_cast <bool> (!VRegs.empty() && "No predecessors? The entry block should bail out earlier" ) ? void (0) : __assert_fail ("!VRegs.empty() && \"No predecessors? The entry block should bail out earlier\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1263, __extension__ __PRETTY_FUNCTION__)) | |||
1263 | "No predecessors? The entry block should bail out earlier")(static_cast <bool> (!VRegs.empty() && "No predecessors? The entry block should bail out earlier" ) ? void (0) : __assert_fail ("!VRegs.empty() && \"No predecessors? The entry block should bail out earlier\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1263, __extension__ __PRETTY_FUNCTION__)); | |||
1264 | // Just forward the swifterror vreg from the predecessor(s). | |||
1265 | FuncInfo->setCurrentSwiftErrorVReg(MBB, SwiftErrorVal, VRegs[0].second); | |||
1266 | continue; | |||
1267 | } | |||
1268 | ||||
1269 | auto DLoc = isa<Instruction>(SwiftErrorVal) | |||
1270 | ? dyn_cast<Instruction>(SwiftErrorVal)->getDebugLoc() | |||
1271 | : DebugLoc(); | |||
1272 | const auto *TII = FuncInfo->MF->getSubtarget().getInstrInfo(); | |||
1273 | ||||
1274 | // If we don't need a phi create a copy to the upward exposed vreg. | |||
1275 | if (!needPHI) { | |||
1276 | assert(UpwardsUse)(static_cast <bool> (UpwardsUse) ? void (0) : __assert_fail ("UpwardsUse", "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1276, __extension__ __PRETTY_FUNCTION__)); | |||
1277 | assert(!VRegs.empty() &&(static_cast <bool> (!VRegs.empty() && "No predecessors? Is the Calling Convention correct?" ) ? void (0) : __assert_fail ("!VRegs.empty() && \"No predecessors? Is the Calling Convention correct?\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1278, __extension__ __PRETTY_FUNCTION__)) | |||
1278 | "No predecessors? Is the Calling Convention correct?")(static_cast <bool> (!VRegs.empty() && "No predecessors? Is the Calling Convention correct?" ) ? void (0) : __assert_fail ("!VRegs.empty() && \"No predecessors? Is the Calling Convention correct?\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1278, __extension__ __PRETTY_FUNCTION__)); | |||
1279 | unsigned DestReg = UUseVReg; | |||
1280 | BuildMI(*MBB, MBB->getFirstNonPHI(), DLoc, TII->get(TargetOpcode::COPY), | |||
1281 | DestReg) | |||
1282 | .addReg(VRegs[0].second); | |||
1283 | continue; | |||
1284 | } | |||
1285 | ||||
1286 | // We need a phi: if there is an upwards exposed use we already have a | |||
1287 | // destination virtual register number otherwise we generate a new one. | |||
1288 | auto &DL = FuncInfo->MF->getDataLayout(); | |||
1289 | auto const *RC = TLI->getRegClassFor(TLI->getPointerTy(DL)); | |||
1290 | unsigned PHIVReg = | |||
1291 | UpwardsUse ? UUseVReg | |||
1292 | : FuncInfo->MF->getRegInfo().createVirtualRegister(RC); | |||
1293 | MachineInstrBuilder SwiftErrorPHI = | |||
1294 | BuildMI(*MBB, MBB->getFirstNonPHI(), DLoc, | |||
1295 | TII->get(TargetOpcode::PHI), PHIVReg); | |||
1296 | for (auto BBRegPair : VRegs) { | |||
1297 | SwiftErrorPHI.addReg(BBRegPair.second).addMBB(BBRegPair.first); | |||
1298 | } | |||
1299 | ||||
1300 | // We did not have a definition in this block before: store the phi's vreg | |||
1301 | // as this block downward exposed def. | |||
1302 | if (!UpwardsUse) | |||
1303 | FuncInfo->setCurrentSwiftErrorVReg(MBB, SwiftErrorVal, PHIVReg); | |||
1304 | } | |||
1305 | } | |||
1306 | } | |||
1307 | ||||
1308 | static void preassignSwiftErrorRegs(const TargetLowering *TLI, | |||
1309 | FunctionLoweringInfo *FuncInfo, | |||
1310 | BasicBlock::const_iterator Begin, | |||
1311 | BasicBlock::const_iterator End) { | |||
1312 | if (!TLI->supportSwiftError() || FuncInfo->SwiftErrorVals.empty()) | |||
1313 | return; | |||
1314 | ||||
1315 | // Iterator over instructions and assign vregs to swifterror defs and uses. | |||
1316 | for (auto It = Begin; It != End; ++It) { | |||
1317 | ImmutableCallSite CS(&*It); | |||
1318 | if (CS) { | |||
1319 | // A call-site with a swifterror argument is both use and def. | |||
1320 | const Value *SwiftErrorAddr = nullptr; | |||
1321 | for (auto &Arg : CS.args()) { | |||
1322 | if (!Arg->isSwiftError()) | |||
1323 | continue; | |||
1324 | // Use of swifterror. | |||
1325 | assert(!SwiftErrorAddr && "Cannot have multiple swifterror arguments")(static_cast <bool> (!SwiftErrorAddr && "Cannot have multiple swifterror arguments" ) ? void (0) : __assert_fail ("!SwiftErrorAddr && \"Cannot have multiple swifterror arguments\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1325, __extension__ __PRETTY_FUNCTION__)); | |||
1326 | SwiftErrorAddr = &*Arg; | |||
1327 | assert(SwiftErrorAddr->isSwiftError() &&(static_cast <bool> (SwiftErrorAddr->isSwiftError() && "Must have a swifterror value argument") ? void (0) : __assert_fail ("SwiftErrorAddr->isSwiftError() && \"Must have a swifterror value argument\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1328, __extension__ __PRETTY_FUNCTION__)) | |||
1328 | "Must have a swifterror value argument")(static_cast <bool> (SwiftErrorAddr->isSwiftError() && "Must have a swifterror value argument") ? void (0) : __assert_fail ("SwiftErrorAddr->isSwiftError() && \"Must have a swifterror value argument\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1328, __extension__ __PRETTY_FUNCTION__)); | |||
1329 | unsigned VReg; bool CreatedReg; | |||
1330 | std::tie(VReg, CreatedReg) = FuncInfo->getOrCreateSwiftErrorVRegUseAt( | |||
1331 | &*It, FuncInfo->MBB, SwiftErrorAddr); | |||
1332 | assert(CreatedReg)(static_cast <bool> (CreatedReg) ? void (0) : __assert_fail ("CreatedReg", "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1332, __extension__ __PRETTY_FUNCTION__)); | |||
1333 | } | |||
1334 | if (!SwiftErrorAddr) | |||
1335 | continue; | |||
1336 | ||||
1337 | // Def of swifterror. | |||
1338 | unsigned VReg; bool CreatedReg; | |||
1339 | std::tie(VReg, CreatedReg) = | |||
1340 | FuncInfo->getOrCreateSwiftErrorVRegDefAt(&*It); | |||
1341 | assert(CreatedReg)(static_cast <bool> (CreatedReg) ? void (0) : __assert_fail ("CreatedReg", "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1341, __extension__ __PRETTY_FUNCTION__)); | |||
1342 | FuncInfo->setCurrentSwiftErrorVReg(FuncInfo->MBB, SwiftErrorAddr, VReg); | |||
1343 | ||||
1344 | // A load is a use. | |||
1345 | } else if (const LoadInst *LI = dyn_cast<const LoadInst>(&*It)) { | |||
1346 | const Value *V = LI->getOperand(0); | |||
1347 | if (!V->isSwiftError()) | |||
1348 | continue; | |||
1349 | ||||
1350 | unsigned VReg; bool CreatedReg; | |||
1351 | std::tie(VReg, CreatedReg) = | |||
1352 | FuncInfo->getOrCreateSwiftErrorVRegUseAt(LI, FuncInfo->MBB, V); | |||
1353 | assert(CreatedReg)(static_cast <bool> (CreatedReg) ? void (0) : __assert_fail ("CreatedReg", "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1353, __extension__ __PRETTY_FUNCTION__)); | |||
1354 | ||||
1355 | // A store is a def. | |||
1356 | } else if (const StoreInst *SI = dyn_cast<const StoreInst>(&*It)) { | |||
1357 | const Value *SwiftErrorAddr = SI->getOperand(1); | |||
1358 | if (!SwiftErrorAddr->isSwiftError()) | |||
1359 | continue; | |||
1360 | ||||
1361 | // Def of swifterror. | |||
1362 | unsigned VReg; bool CreatedReg; | |||
1363 | std::tie(VReg, CreatedReg) = | |||
1364 | FuncInfo->getOrCreateSwiftErrorVRegDefAt(&*It); | |||
1365 | assert(CreatedReg)(static_cast <bool> (CreatedReg) ? void (0) : __assert_fail ("CreatedReg", "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1365, __extension__ __PRETTY_FUNCTION__)); | |||
1366 | FuncInfo->setCurrentSwiftErrorVReg(FuncInfo->MBB, SwiftErrorAddr, VReg); | |||
1367 | ||||
1368 | // A return in a swiferror returning function is a use. | |||
1369 | } else if (const ReturnInst *R = dyn_cast<const ReturnInst>(&*It)) { | |||
1370 | const Function *F = R->getParent()->getParent(); | |||
1371 | if(!F->getAttributes().hasAttrSomewhere(Attribute::SwiftError)) | |||
1372 | continue; | |||
1373 | ||||
1374 | unsigned VReg; bool CreatedReg; | |||
1375 | std::tie(VReg, CreatedReg) = FuncInfo->getOrCreateSwiftErrorVRegUseAt( | |||
1376 | R, FuncInfo->MBB, FuncInfo->SwiftErrorArg); | |||
1377 | assert(CreatedReg)(static_cast <bool> (CreatedReg) ? void (0) : __assert_fail ("CreatedReg", "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1377, __extension__ __PRETTY_FUNCTION__)); | |||
1378 | } | |||
1379 | } | |||
1380 | } | |||
1381 | ||||
1382 | void SelectionDAGISel::SelectAllBasicBlocks(const Function &Fn) { | |||
1383 | FastISelFailed = false; | |||
1384 | // Initialize the Fast-ISel state, if needed. | |||
1385 | FastISel *FastIS = nullptr; | |||
1386 | if (TM.Options.EnableFastISel) { | |||
1387 | DEBUG(dbgs() << "Enabling fast-isel\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Enabling fast-isel\n"; } } while (false); | |||
1388 | FastIS = TLI->createFastISel(*FuncInfo, LibInfo); | |||
1389 | } | |||
1390 | ||||
1391 | setupSwiftErrorVals(Fn, TLI, FuncInfo); | |||
1392 | ||||
1393 | ReversePostOrderTraversal<const Function*> RPOT(&Fn); | |||
1394 | ||||
1395 | // Lower arguments up front. An RPO iteration always visits the entry block | |||
1396 | // first. | |||
1397 | assert(*RPOT.begin() == &Fn.getEntryBlock())(static_cast <bool> (*RPOT.begin() == &Fn.getEntryBlock ()) ? void (0) : __assert_fail ("*RPOT.begin() == &Fn.getEntryBlock()" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1397, __extension__ __PRETTY_FUNCTION__)); | |||
1398 | ++NumEntryBlocks; | |||
1399 | ||||
1400 | // Set up FuncInfo for ISel. Entry blocks never have PHIs. | |||
1401 | FuncInfo->MBB = FuncInfo->MBBMap[&Fn.getEntryBlock()]; | |||
1402 | FuncInfo->InsertPt = FuncInfo->MBB->begin(); | |||
1403 | ||||
1404 | if (!FastIS) { | |||
1405 | LowerArguments(Fn); | |||
1406 | } else { | |||
1407 | // See if fast isel can lower the arguments. | |||
1408 | FastIS->startNewBlock(); | |||
1409 | if (!FastIS->lowerArguments()) { | |||
1410 | FastISelFailed = true; | |||
1411 | // Fast isel failed to lower these arguments | |||
1412 | ++NumFastIselFailLowerArguments; | |||
1413 | ||||
1414 | OptimizationRemarkMissed R("sdagisel", "FastISelFailure", | |||
1415 | Fn.getSubprogram(), | |||
1416 | &Fn.getEntryBlock()); | |||
1417 | R << "FastISel didn't lower all arguments: " | |||
1418 | << ore::NV("Prototype", Fn.getType()); | |||
1419 | reportFastISelFailure(*MF, *ORE, R, EnableFastISelAbort > 1); | |||
1420 | ||||
1421 | // Use SelectionDAG argument lowering | |||
1422 | LowerArguments(Fn); | |||
1423 | CurDAG->setRoot(SDB->getControlRoot()); | |||
1424 | SDB->clear(); | |||
1425 | CodeGenAndEmitDAG(); | |||
1426 | } | |||
1427 | ||||
1428 | // If we inserted any instructions at the beginning, make a note of | |||
1429 | // where they are, so we can be sure to emit subsequent instructions | |||
1430 | // after them. | |||
1431 | if (FuncInfo->InsertPt != FuncInfo->MBB->begin()) | |||
1432 | FastIS->setLastLocalValue(&*std::prev(FuncInfo->InsertPt)); | |||
1433 | else | |||
1434 | FastIS->setLastLocalValue(nullptr); | |||
1435 | } | |||
1436 | createSwiftErrorEntriesInEntryBlock(FuncInfo, FastIS, TLI, TII, SDB); | |||
1437 | ||||
1438 | processDbgDeclares(FuncInfo); | |||
1439 | ||||
1440 | // Iterate over all basic blocks in the function. | |||
1441 | for (const BasicBlock *LLVMBB : RPOT) { | |||
1442 | if (OptLevel != CodeGenOpt::None) { | |||
1443 | bool AllPredsVisited = true; | |||
1444 | for (const_pred_iterator PI = pred_begin(LLVMBB), PE = pred_end(LLVMBB); | |||
1445 | PI != PE; ++PI) { | |||
1446 | if (!FuncInfo->VisitedBBs.count(*PI)) { | |||
1447 | AllPredsVisited = false; | |||
1448 | break; | |||
1449 | } | |||
1450 | } | |||
1451 | ||||
1452 | if (AllPredsVisited) { | |||
1453 | for (const PHINode &PN : LLVMBB->phis()) | |||
1454 | FuncInfo->ComputePHILiveOutRegInfo(&PN); | |||
1455 | } else { | |||
1456 | for (const PHINode &PN : LLVMBB->phis()) | |||
1457 | FuncInfo->InvalidatePHILiveOutRegInfo(&PN); | |||
1458 | } | |||
1459 | ||||
1460 | FuncInfo->VisitedBBs.insert(LLVMBB); | |||
1461 | } | |||
1462 | ||||
1463 | BasicBlock::const_iterator const Begin = | |||
1464 | LLVMBB->getFirstNonPHI()->getIterator(); | |||
1465 | BasicBlock::const_iterator const End = LLVMBB->end(); | |||
1466 | BasicBlock::const_iterator BI = End; | |||
1467 | ||||
1468 | FuncInfo->MBB = FuncInfo->MBBMap[LLVMBB]; | |||
1469 | if (!FuncInfo->MBB) | |||
1470 | continue; // Some blocks like catchpads have no code or MBB. | |||
1471 | ||||
1472 | // Insert new instructions after any phi or argument setup code. | |||
1473 | FuncInfo->InsertPt = FuncInfo->MBB->end(); | |||
1474 | ||||
1475 | // Setup an EH landing-pad block. | |||
1476 | FuncInfo->ExceptionPointerVirtReg = 0; | |||
1477 | FuncInfo->ExceptionSelectorVirtReg = 0; | |||
1478 | if (LLVMBB->isEHPad()) | |||
1479 | if (!PrepareEHLandingPad()) | |||
1480 | continue; | |||
1481 | ||||
1482 | // Before doing SelectionDAG ISel, see if FastISel has been requested. | |||
1483 | if (FastIS) { | |||
1484 | if (LLVMBB != &Fn.getEntryBlock()) | |||
1485 | FastIS->startNewBlock(); | |||
1486 | ||||
1487 | unsigned NumFastIselRemaining = std::distance(Begin, End); | |||
1488 | ||||
1489 | // Pre-assign swifterror vregs. | |||
1490 | preassignSwiftErrorRegs(TLI, FuncInfo, Begin, End); | |||
1491 | ||||
1492 | // Do FastISel on as many instructions as possible. | |||
1493 | for (; BI != Begin; --BI) { | |||
1494 | const Instruction *Inst = &*std::prev(BI); | |||
1495 | ||||
1496 | // If we no longer require this instruction, skip it. | |||
1497 | if (isFoldedOrDeadInstruction(Inst, FuncInfo) || | |||
1498 | ElidedArgCopyInstrs.count(Inst)) { | |||
1499 | --NumFastIselRemaining; | |||
1500 | continue; | |||
1501 | } | |||
1502 | ||||
1503 | // Bottom-up: reset the insert pos at the top, after any local-value | |||
1504 | // instructions. | |||
1505 | FastIS->recomputeInsertPt(); | |||
1506 | ||||
1507 | // Try to select the instruction with FastISel. | |||
1508 | if (FastIS->selectInstruction(Inst)) { | |||
1509 | --NumFastIselRemaining; | |||
1510 | ++NumFastIselSuccess; | |||
1511 | // If fast isel succeeded, skip over all the folded instructions, and | |||
1512 | // then see if there is a load right before the selected instructions. | |||
1513 | // Try to fold the load if so. | |||
1514 | const Instruction *BeforeInst = Inst; | |||
1515 | while (BeforeInst != &*Begin) { | |||
1516 | BeforeInst = &*std::prev(BasicBlock::const_iterator(BeforeInst)); | |||
1517 | if (!isFoldedOrDeadInstruction(BeforeInst, FuncInfo)) | |||
1518 | break; | |||
1519 | } | |||
1520 | if (BeforeInst != Inst && isa<LoadInst>(BeforeInst) && | |||
1521 | BeforeInst->hasOneUse() && | |||
1522 | FastIS->tryToFoldLoad(cast<LoadInst>(BeforeInst), Inst)) { | |||
1523 | // If we succeeded, don't re-select the load. | |||
1524 | BI = std::next(BasicBlock::const_iterator(BeforeInst)); | |||
1525 | --NumFastIselRemaining; | |||
1526 | ++NumFastIselSuccess; | |||
1527 | } | |||
1528 | continue; | |||
1529 | } | |||
1530 | ||||
1531 | FastISelFailed = true; | |||
1532 | ||||
1533 | // Then handle certain instructions as single-LLVM-Instruction blocks. | |||
1534 | // We cannot separate out GCrelocates to their own blocks since we need | |||
1535 | // to keep track of gc-relocates for a particular gc-statepoint. This is | |||
1536 | // done by SelectionDAGBuilder::LowerAsSTATEPOINT, called before | |||
1537 | // visitGCRelocate. | |||
1538 | if (isa<CallInst>(Inst) && !isStatepoint(Inst) && !isGCRelocate(Inst)) { | |||
1539 | OptimizationRemarkMissed R("sdagisel", "FastISelFailure", | |||
1540 | Inst->getDebugLoc(), LLVMBB); | |||
1541 | ||||
1542 | R << "FastISel missed call"; | |||
1543 | ||||
1544 | if (R.isEnabled() || EnableFastISelAbort) { | |||
1545 | std::string InstStrStorage; | |||
1546 | raw_string_ostream InstStr(InstStrStorage); | |||
1547 | InstStr << *Inst; | |||
1548 | ||||
1549 | R << ": " << InstStr.str(); | |||
1550 | } | |||
1551 | ||||
1552 | reportFastISelFailure(*MF, *ORE, R, EnableFastISelAbort > 2); | |||
1553 | ||||
1554 | if (!Inst->getType()->isVoidTy() && !Inst->getType()->isTokenTy() && | |||
1555 | !Inst->use_empty()) { | |||
1556 | unsigned &R = FuncInfo->ValueMap[Inst]; | |||
1557 | if (!R) | |||
1558 | R = FuncInfo->CreateRegs(Inst->getType()); | |||
1559 | } | |||
1560 | ||||
1561 | bool HadTailCall = false; | |||
1562 | MachineBasicBlock::iterator SavedInsertPt = FuncInfo->InsertPt; | |||
1563 | SelectBasicBlock(Inst->getIterator(), BI, HadTailCall); | |||
1564 | ||||
1565 | // If the call was emitted as a tail call, we're done with the block. | |||
1566 | // We also need to delete any previously emitted instructions. | |||
1567 | if (HadTailCall) { | |||
1568 | FastIS->removeDeadCode(SavedInsertPt, FuncInfo->MBB->end()); | |||
1569 | --BI; | |||
1570 | break; | |||
1571 | } | |||
1572 | ||||
1573 | // Recompute NumFastIselRemaining as Selection DAG instruction | |||
1574 | // selection may have handled the call, input args, etc. | |||
1575 | unsigned RemainingNow = std::distance(Begin, BI); | |||
1576 | NumFastIselFailures += NumFastIselRemaining - RemainingNow; | |||
1577 | NumFastIselRemaining = RemainingNow; | |||
1578 | continue; | |||
1579 | } | |||
1580 | ||||
1581 | OptimizationRemarkMissed R("sdagisel", "FastISelFailure", | |||
1582 | Inst->getDebugLoc(), LLVMBB); | |||
1583 | ||||
1584 | bool ShouldAbort = EnableFastISelAbort; | |||
1585 | if (isa<TerminatorInst>(Inst)) { | |||
1586 | // Use a different message for terminator misses. | |||
1587 | R << "FastISel missed terminator"; | |||
1588 | // Don't abort for terminator unless the level is really high | |||
1589 | ShouldAbort = (EnableFastISelAbort > 2); | |||
1590 | } else { | |||
1591 | R << "FastISel missed"; | |||
1592 | } | |||
1593 | ||||
1594 | if (R.isEnabled() || EnableFastISelAbort) { | |||
1595 | std::string InstStrStorage; | |||
1596 | raw_string_ostream InstStr(InstStrStorage); | |||
1597 | InstStr << *Inst; | |||
1598 | R << ": " << InstStr.str(); | |||
1599 | } | |||
1600 | ||||
1601 | reportFastISelFailure(*MF, *ORE, R, ShouldAbort); | |||
1602 | ||||
1603 | NumFastIselFailures += NumFastIselRemaining; | |||
1604 | break; | |||
1605 | } | |||
1606 | ||||
1607 | FastIS->recomputeInsertPt(); | |||
1608 | } | |||
1609 | ||||
1610 | if (getAnalysis<StackProtector>().shouldEmitSDCheck(*LLVMBB)) { | |||
1611 | bool FunctionBasedInstrumentation = | |||
1612 | TLI->getSSPStackGuardCheck(*Fn.getParent()); | |||
1613 | SDB->SPDescriptor.initialize(LLVMBB, FuncInfo->MBBMap[LLVMBB], | |||
1614 | FunctionBasedInstrumentation); | |||
1615 | } | |||
1616 | ||||
1617 | if (Begin != BI) | |||
1618 | ++NumDAGBlocks; | |||
1619 | else | |||
1620 | ++NumFastIselBlocks; | |||
1621 | ||||
1622 | if (Begin != BI) { | |||
1623 | // Run SelectionDAG instruction selection on the remainder of the block | |||
1624 | // not handled by FastISel. If FastISel is not run, this is the entire | |||
1625 | // block. | |||
1626 | bool HadTailCall; | |||
1627 | SelectBasicBlock(Begin, BI, HadTailCall); | |||
1628 | ||||
1629 | // But if FastISel was run, we already selected some of the block. | |||
1630 | // If we emitted a tail-call, we need to delete any previously emitted | |||
1631 | // instruction that follows it. | |||
1632 | if (HadTailCall && FuncInfo->InsertPt != FuncInfo->MBB->end()) | |||
1633 | FastIS->removeDeadCode(FuncInfo->InsertPt, FuncInfo->MBB->end()); | |||
| ||||
1634 | } | |||
1635 | ||||
1636 | FinishBasicBlock(); | |||
1637 | FuncInfo->PHINodesToUpdate.clear(); | |||
1638 | ElidedArgCopyInstrs.clear(); | |||
1639 | } | |||
1640 | ||||
1641 | propagateSwiftErrorVRegs(FuncInfo); | |||
1642 | ||||
1643 | delete FastIS; | |||
1644 | SDB->clearDanglingDebugInfo(); | |||
1645 | SDB->SPDescriptor.resetPerFunctionState(); | |||
1646 | } | |||
1647 | ||||
1648 | /// Given that the input MI is before a partial terminator sequence TSeq, return | |||
1649 | /// true if M + TSeq also a partial terminator sequence. | |||
1650 | /// | |||
1651 | /// A Terminator sequence is a sequence of MachineInstrs which at this point in | |||
1652 | /// lowering copy vregs into physical registers, which are then passed into | |||
1653 | /// terminator instructors so we can satisfy ABI constraints. A partial | |||
1654 | /// terminator sequence is an improper subset of a terminator sequence (i.e. it | |||
1655 | /// may be the whole terminator sequence). | |||
1656 | static bool MIIsInTerminatorSequence(const MachineInstr &MI) { | |||
1657 | // If we do not have a copy or an implicit def, we return true if and only if | |||
1658 | // MI is a debug value. | |||
1659 | if (!MI.isCopy() && !MI.isImplicitDef()) | |||
1660 | // Sometimes DBG_VALUE MI sneak in between the copies from the vregs to the | |||
1661 | // physical registers if there is debug info associated with the terminator | |||
1662 | // of our mbb. We want to include said debug info in our terminator | |||
1663 | // sequence, so we return true in that case. | |||
1664 | return MI.isDebugValue(); | |||
1665 | ||||
1666 | // We have left the terminator sequence if we are not doing one of the | |||
1667 | // following: | |||
1668 | // | |||
1669 | // 1. Copying a vreg into a physical register. | |||
1670 | // 2. Copying a vreg into a vreg. | |||
1671 | // 3. Defining a register via an implicit def. | |||
1672 | ||||
1673 | // OPI should always be a register definition... | |||
1674 | MachineInstr::const_mop_iterator OPI = MI.operands_begin(); | |||
1675 | if (!OPI->isReg() || !OPI->isDef()) | |||
1676 | return false; | |||
1677 | ||||
1678 | // Defining any register via an implicit def is always ok. | |||
1679 | if (MI.isImplicitDef()) | |||
1680 | return true; | |||
1681 | ||||
1682 | // Grab the copy source... | |||
1683 | MachineInstr::const_mop_iterator OPI2 = OPI; | |||
1684 | ++OPI2; | |||
1685 | assert(OPI2 != MI.operands_end()(static_cast <bool> (OPI2 != MI.operands_end() && "Should have a copy implying we should have 2 arguments.") ? void (0) : __assert_fail ("OPI2 != MI.operands_end() && \"Should have a copy implying we should have 2 arguments.\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1686, __extension__ __PRETTY_FUNCTION__)) | |||
1686 | && "Should have a copy implying we should have 2 arguments.")(static_cast <bool> (OPI2 != MI.operands_end() && "Should have a copy implying we should have 2 arguments.") ? void (0) : __assert_fail ("OPI2 != MI.operands_end() && \"Should have a copy implying we should have 2 arguments.\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1686, __extension__ __PRETTY_FUNCTION__)); | |||
1687 | ||||
1688 | // Make sure that the copy dest is not a vreg when the copy source is a | |||
1689 | // physical register. | |||
1690 | if (!OPI2->isReg() || | |||
1691 | (!TargetRegisterInfo::isPhysicalRegister(OPI->getReg()) && | |||
1692 | TargetRegisterInfo::isPhysicalRegister(OPI2->getReg()))) | |||
1693 | return false; | |||
1694 | ||||
1695 | return true; | |||
1696 | } | |||
1697 | ||||
1698 | /// Find the split point at which to splice the end of BB into its success stack | |||
1699 | /// protector check machine basic block. | |||
1700 | /// | |||
1701 | /// On many platforms, due to ABI constraints, terminators, even before register | |||
1702 | /// allocation, use physical registers. This creates an issue for us since | |||
1703 | /// physical registers at this point can not travel across basic | |||
1704 | /// blocks. Luckily, selectiondag always moves physical registers into vregs | |||
1705 | /// when they enter functions and moves them through a sequence of copies back | |||
1706 | /// into the physical registers right before the terminator creating a | |||
1707 | /// ``Terminator Sequence''. This function is searching for the beginning of the | |||
1708 | /// terminator sequence so that we can ensure that we splice off not just the | |||
1709 | /// terminator, but additionally the copies that move the vregs into the | |||
1710 | /// physical registers. | |||
1711 | static MachineBasicBlock::iterator | |||
1712 | FindSplitPointForStackProtector(MachineBasicBlock *BB) { | |||
1713 | MachineBasicBlock::iterator SplitPoint = BB->getFirstTerminator(); | |||
1714 | // | |||
1715 | if (SplitPoint == BB->begin()) | |||
1716 | return SplitPoint; | |||
1717 | ||||
1718 | MachineBasicBlock::iterator Start = BB->begin(); | |||
1719 | MachineBasicBlock::iterator Previous = SplitPoint; | |||
1720 | --Previous; | |||
1721 | ||||
1722 | while (MIIsInTerminatorSequence(*Previous)) { | |||
1723 | SplitPoint = Previous; | |||
1724 | if (Previous == Start) | |||
1725 | break; | |||
1726 | --Previous; | |||
1727 | } | |||
1728 | ||||
1729 | return SplitPoint; | |||
1730 | } | |||
1731 | ||||
1732 | void | |||
1733 | SelectionDAGISel::FinishBasicBlock() { | |||
1734 | DEBUG(dbgs() << "Total amount of phi nodes to update: "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Total amount of phi nodes to update: " << FuncInfo->PHINodesToUpdate.size() << "\n"; for (unsigned i = 0, e = FuncInfo->PHINodesToUpdate.size( ); i != e; ++i) dbgs() << "Node " << i << " : (" << FuncInfo->PHINodesToUpdate[i].first << ", " << FuncInfo->PHINodesToUpdate[i].second << ")\n" ; } } while (false) | |||
1735 | << FuncInfo->PHINodesToUpdate.size() << "\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Total amount of phi nodes to update: " << FuncInfo->PHINodesToUpdate.size() << "\n"; for (unsigned i = 0, e = FuncInfo->PHINodesToUpdate.size( ); i != e; ++i) dbgs() << "Node " << i << " : (" << FuncInfo->PHINodesToUpdate[i].first << ", " << FuncInfo->PHINodesToUpdate[i].second << ")\n" ; } } while (false) | |||
1736 | for (unsigned i = 0, e = FuncInfo->PHINodesToUpdate.size(); i != e; ++i)do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Total amount of phi nodes to update: " << FuncInfo->PHINodesToUpdate.size() << "\n"; for (unsigned i = 0, e = FuncInfo->PHINodesToUpdate.size( ); i != e; ++i) dbgs() << "Node " << i << " : (" << FuncInfo->PHINodesToUpdate[i].first << ", " << FuncInfo->PHINodesToUpdate[i].second << ")\n" ; } } while (false) | |||
1737 | dbgs() << "Node " << i << " : ("do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Total amount of phi nodes to update: " << FuncInfo->PHINodesToUpdate.size() << "\n"; for (unsigned i = 0, e = FuncInfo->PHINodesToUpdate.size( ); i != e; ++i) dbgs() << "Node " << i << " : (" << FuncInfo->PHINodesToUpdate[i].first << ", " << FuncInfo->PHINodesToUpdate[i].second << ")\n" ; } } while (false) | |||
1738 | << FuncInfo->PHINodesToUpdate[i].firstdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Total amount of phi nodes to update: " << FuncInfo->PHINodesToUpdate.size() << "\n"; for (unsigned i = 0, e = FuncInfo->PHINodesToUpdate.size( ); i != e; ++i) dbgs() << "Node " << i << " : (" << FuncInfo->PHINodesToUpdate[i].first << ", " << FuncInfo->PHINodesToUpdate[i].second << ")\n" ; } } while (false) | |||
1739 | << ", " << FuncInfo->PHINodesToUpdate[i].second << ")\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Total amount of phi nodes to update: " << FuncInfo->PHINodesToUpdate.size() << "\n"; for (unsigned i = 0, e = FuncInfo->PHINodesToUpdate.size( ); i != e; ++i) dbgs() << "Node " << i << " : (" << FuncInfo->PHINodesToUpdate[i].first << ", " << FuncInfo->PHINodesToUpdate[i].second << ")\n" ; } } while (false); | |||
1740 | ||||
1741 | // Next, now that we know what the last MBB the LLVM BB expanded is, update | |||
1742 | // PHI nodes in successors. | |||
1743 | for (unsigned i = 0, e = FuncInfo->PHINodesToUpdate.size(); i != e; ++i) { | |||
1744 | MachineInstrBuilder PHI(*MF, FuncInfo->PHINodesToUpdate[i].first); | |||
1745 | assert(PHI->isPHI() &&(static_cast <bool> (PHI->isPHI() && "This is not a machine PHI node that we are updating!" ) ? void (0) : __assert_fail ("PHI->isPHI() && \"This is not a machine PHI node that we are updating!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1746, __extension__ __PRETTY_FUNCTION__)) | |||
1746 | "This is not a machine PHI node that we are updating!")(static_cast <bool> (PHI->isPHI() && "This is not a machine PHI node that we are updating!" ) ? void (0) : __assert_fail ("PHI->isPHI() && \"This is not a machine PHI node that we are updating!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1746, __extension__ __PRETTY_FUNCTION__)); | |||
1747 | if (!FuncInfo->MBB->isSuccessor(PHI->getParent())) | |||
1748 | continue; | |||
1749 | PHI.addReg(FuncInfo->PHINodesToUpdate[i].second).addMBB(FuncInfo->MBB); | |||
1750 | } | |||
1751 | ||||
1752 | // Handle stack protector. | |||
1753 | if (SDB->SPDescriptor.shouldEmitFunctionBasedCheckStackProtector()) { | |||
1754 | // The target provides a guard check function. There is no need to | |||
1755 | // generate error handling code or to split current basic block. | |||
1756 | MachineBasicBlock *ParentMBB = SDB->SPDescriptor.getParentMBB(); | |||
1757 | ||||
1758 | // Add load and check to the basicblock. | |||
1759 | FuncInfo->MBB = ParentMBB; | |||
1760 | FuncInfo->InsertPt = | |||
1761 | FindSplitPointForStackProtector(ParentMBB); | |||
1762 | SDB->visitSPDescriptorParent(SDB->SPDescriptor, ParentMBB); | |||
1763 | CurDAG->setRoot(SDB->getRoot()); | |||
1764 | SDB->clear(); | |||
1765 | CodeGenAndEmitDAG(); | |||
1766 | ||||
1767 | // Clear the Per-BB State. | |||
1768 | SDB->SPDescriptor.resetPerBBState(); | |||
1769 | } else if (SDB->SPDescriptor.shouldEmitStackProtector()) { | |||
1770 | MachineBasicBlock *ParentMBB = SDB->SPDescriptor.getParentMBB(); | |||
1771 | MachineBasicBlock *SuccessMBB = SDB->SPDescriptor.getSuccessMBB(); | |||
1772 | ||||
1773 | // Find the split point to split the parent mbb. At the same time copy all | |||
1774 | // physical registers used in the tail of parent mbb into virtual registers | |||
1775 | // before the split point and back into physical registers after the split | |||
1776 | // point. This prevents us needing to deal with Live-ins and many other | |||
1777 | // register allocation issues caused by us splitting the parent mbb. The | |||
1778 | // register allocator will clean up said virtual copies later on. | |||
1779 | MachineBasicBlock::iterator SplitPoint = | |||
1780 | FindSplitPointForStackProtector(ParentMBB); | |||
1781 | ||||
1782 | // Splice the terminator of ParentMBB into SuccessMBB. | |||
1783 | SuccessMBB->splice(SuccessMBB->end(), ParentMBB, | |||
1784 | SplitPoint, | |||
1785 | ParentMBB->end()); | |||
1786 | ||||
1787 | // Add compare/jump on neq/jump to the parent BB. | |||
1788 | FuncInfo->MBB = ParentMBB; | |||
1789 | FuncInfo->InsertPt = ParentMBB->end(); | |||
1790 | SDB->visitSPDescriptorParent(SDB->SPDescriptor, ParentMBB); | |||
1791 | CurDAG->setRoot(SDB->getRoot()); | |||
1792 | SDB->clear(); | |||
1793 | CodeGenAndEmitDAG(); | |||
1794 | ||||
1795 | // CodeGen Failure MBB if we have not codegened it yet. | |||
1796 | MachineBasicBlock *FailureMBB = SDB->SPDescriptor.getFailureMBB(); | |||
1797 | if (FailureMBB->empty()) { | |||
1798 | FuncInfo->MBB = FailureMBB; | |||
1799 | FuncInfo->InsertPt = FailureMBB->end(); | |||
1800 | SDB->visitSPDescriptorFailure(SDB->SPDescriptor); | |||
1801 | CurDAG->setRoot(SDB->getRoot()); | |||
1802 | SDB->clear(); | |||
1803 | CodeGenAndEmitDAG(); | |||
1804 | } | |||
1805 | ||||
1806 | // Clear the Per-BB State. | |||
1807 | SDB->SPDescriptor.resetPerBBState(); | |||
1808 | } | |||
1809 | ||||
1810 | // Lower each BitTestBlock. | |||
1811 | for (auto &BTB : SDB->BitTestCases) { | |||
1812 | // Lower header first, if it wasn't already lowered | |||
1813 | if (!BTB.Emitted) { | |||
1814 | // Set the current basic block to the mbb we wish to insert the code into | |||
1815 | FuncInfo->MBB = BTB.Parent; | |||
1816 | FuncInfo->InsertPt = FuncInfo->MBB->end(); | |||
1817 | // Emit the code | |||
1818 | SDB->visitBitTestHeader(BTB, FuncInfo->MBB); | |||
1819 | CurDAG->setRoot(SDB->getRoot()); | |||
1820 | SDB->clear(); | |||
1821 | CodeGenAndEmitDAG(); | |||
1822 | } | |||
1823 | ||||
1824 | BranchProbability UnhandledProb = BTB.Prob; | |||
1825 | for (unsigned j = 0, ej = BTB.Cases.size(); j != ej; ++j) { | |||
1826 | UnhandledProb -= BTB.Cases[j].ExtraProb; | |||
1827 | // Set the current basic block to the mbb we wish to insert the code into | |||
1828 | FuncInfo->MBB = BTB.Cases[j].ThisBB; | |||
1829 | FuncInfo->InsertPt = FuncInfo->MBB->end(); | |||
1830 | // Emit the code | |||
1831 | ||||
1832 | // If all cases cover a contiguous range, it is not necessary to jump to | |||
1833 | // the default block after the last bit test fails. This is because the | |||
1834 | // range check during bit test header creation has guaranteed that every | |||
1835 | // case here doesn't go outside the range. In this case, there is no need | |||
1836 | // to perform the last bit test, as it will always be true. Instead, make | |||
1837 | // the second-to-last bit-test fall through to the target of the last bit | |||
1838 | // test, and delete the last bit test. | |||
1839 | ||||
1840 | MachineBasicBlock *NextMBB; | |||
1841 | if (BTB.ContiguousRange && j + 2 == ej) { | |||
1842 | // Second-to-last bit-test with contiguous range: fall through to the | |||
1843 | // target of the final bit test. | |||
1844 | NextMBB = BTB.Cases[j + 1].TargetBB; | |||
1845 | } else if (j + 1 == ej) { | |||
1846 | // For the last bit test, fall through to Default. | |||
1847 | NextMBB = BTB.Default; | |||
1848 | } else { | |||
1849 | // Otherwise, fall through to the next bit test. | |||
1850 | NextMBB = BTB.Cases[j + 1].ThisBB; | |||
1851 | } | |||
1852 | ||||
1853 | SDB->visitBitTestCase(BTB, NextMBB, UnhandledProb, BTB.Reg, BTB.Cases[j], | |||
1854 | FuncInfo->MBB); | |||
1855 | ||||
1856 | CurDAG->setRoot(SDB->getRoot()); | |||
1857 | SDB->clear(); | |||
1858 | CodeGenAndEmitDAG(); | |||
1859 | ||||
1860 | if (BTB.ContiguousRange && j + 2 == ej) { | |||
1861 | // Since we're not going to use the final bit test, remove it. | |||
1862 | BTB.Cases.pop_back(); | |||
1863 | break; | |||
1864 | } | |||
1865 | } | |||
1866 | ||||
1867 | // Update PHI Nodes | |||
1868 | for (unsigned pi = 0, pe = FuncInfo->PHINodesToUpdate.size(); | |||
1869 | pi != pe; ++pi) { | |||
1870 | MachineInstrBuilder PHI(*MF, FuncInfo->PHINodesToUpdate[pi].first); | |||
1871 | MachineBasicBlock *PHIBB = PHI->getParent(); | |||
1872 | assert(PHI->isPHI() &&(static_cast <bool> (PHI->isPHI() && "This is not a machine PHI node that we are updating!" ) ? void (0) : __assert_fail ("PHI->isPHI() && \"This is not a machine PHI node that we are updating!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1873, __extension__ __PRETTY_FUNCTION__)) | |||
1873 | "This is not a machine PHI node that we are updating!")(static_cast <bool> (PHI->isPHI() && "This is not a machine PHI node that we are updating!" ) ? void (0) : __assert_fail ("PHI->isPHI() && \"This is not a machine PHI node that we are updating!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1873, __extension__ __PRETTY_FUNCTION__)); | |||
1874 | // This is "default" BB. We have two jumps to it. From "header" BB and | |||
1875 | // from last "case" BB, unless the latter was skipped. | |||
1876 | if (PHIBB == BTB.Default) { | |||
1877 | PHI.addReg(FuncInfo->PHINodesToUpdate[pi].second).addMBB(BTB.Parent); | |||
1878 | if (!BTB.ContiguousRange) { | |||
1879 | PHI.addReg(FuncInfo->PHINodesToUpdate[pi].second) | |||
1880 | .addMBB(BTB.Cases.back().ThisBB); | |||
1881 | } | |||
1882 | } | |||
1883 | // One of "cases" BB. | |||
1884 | for (unsigned j = 0, ej = BTB.Cases.size(); | |||
1885 | j != ej; ++j) { | |||
1886 | MachineBasicBlock* cBB = BTB.Cases[j].ThisBB; | |||
1887 | if (cBB->isSuccessor(PHIBB)) | |||
1888 | PHI.addReg(FuncInfo->PHINodesToUpdate[pi].second).addMBB(cBB); | |||
1889 | } | |||
1890 | } | |||
1891 | } | |||
1892 | SDB->BitTestCases.clear(); | |||
1893 | ||||
1894 | // If the JumpTable record is filled in, then we need to emit a jump table. | |||
1895 | // Updating the PHI nodes is tricky in this case, since we need to determine | |||
1896 | // whether the PHI is a successor of the range check MBB or the jump table MBB | |||
1897 | for (unsigned i = 0, e = SDB->JTCases.size(); i != e; ++i) { | |||
1898 | // Lower header first, if it wasn't already lowered | |||
1899 | if (!SDB->JTCases[i].first.Emitted) { | |||
1900 | // Set the current basic block to the mbb we wish to insert the code into | |||
1901 | FuncInfo->MBB = SDB->JTCases[i].first.HeaderBB; | |||
1902 | FuncInfo->InsertPt = FuncInfo->MBB->end(); | |||
1903 | // Emit the code | |||
1904 | SDB->visitJumpTableHeader(SDB->JTCases[i].second, SDB->JTCases[i].first, | |||
1905 | FuncInfo->MBB); | |||
1906 | CurDAG->setRoot(SDB->getRoot()); | |||
1907 | SDB->clear(); | |||
1908 | CodeGenAndEmitDAG(); | |||
1909 | } | |||
1910 | ||||
1911 | // Set the current basic block to the mbb we wish to insert the code into | |||
1912 | FuncInfo->MBB = SDB->JTCases[i].second.MBB; | |||
1913 | FuncInfo->InsertPt = FuncInfo->MBB->end(); | |||
1914 | // Emit the code | |||
1915 | SDB->visitJumpTable(SDB->JTCases[i].second); | |||
1916 | CurDAG->setRoot(SDB->getRoot()); | |||
1917 | SDB->clear(); | |||
1918 | CodeGenAndEmitDAG(); | |||
1919 | ||||
1920 | // Update PHI Nodes | |||
1921 | for (unsigned pi = 0, pe = FuncInfo->PHINodesToUpdate.size(); | |||
1922 | pi != pe; ++pi) { | |||
1923 | MachineInstrBuilder PHI(*MF, FuncInfo->PHINodesToUpdate[pi].first); | |||
1924 | MachineBasicBlock *PHIBB = PHI->getParent(); | |||
1925 | assert(PHI->isPHI() &&(static_cast <bool> (PHI->isPHI() && "This is not a machine PHI node that we are updating!" ) ? void (0) : __assert_fail ("PHI->isPHI() && \"This is not a machine PHI node that we are updating!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1926, __extension__ __PRETTY_FUNCTION__)) | |||
1926 | "This is not a machine PHI node that we are updating!")(static_cast <bool> (PHI->isPHI() && "This is not a machine PHI node that we are updating!" ) ? void (0) : __assert_fail ("PHI->isPHI() && \"This is not a machine PHI node that we are updating!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1926, __extension__ __PRETTY_FUNCTION__)); | |||
1927 | // "default" BB. We can go there only from header BB. | |||
1928 | if (PHIBB == SDB->JTCases[i].second.Default) | |||
1929 | PHI.addReg(FuncInfo->PHINodesToUpdate[pi].second) | |||
1930 | .addMBB(SDB->JTCases[i].first.HeaderBB); | |||
1931 | // JT BB. Just iterate over successors here | |||
1932 | if (FuncInfo->MBB->isSuccessor(PHIBB)) | |||
1933 | PHI.addReg(FuncInfo->PHINodesToUpdate[pi].second).addMBB(FuncInfo->MBB); | |||
1934 | } | |||
1935 | } | |||
1936 | SDB->JTCases.clear(); | |||
1937 | ||||
1938 | // If we generated any switch lowering information, build and codegen any | |||
1939 | // additional DAGs necessary. | |||
1940 | for (unsigned i = 0, e = SDB->SwitchCases.size(); i != e; ++i) { | |||
1941 | // Set the current basic block to the mbb we wish to insert the code into | |||
1942 | FuncInfo->MBB = SDB->SwitchCases[i].ThisBB; | |||
1943 | FuncInfo->InsertPt = FuncInfo->MBB->end(); | |||
1944 | ||||
1945 | // Determine the unique successors. | |||
1946 | SmallVector<MachineBasicBlock *, 2> Succs; | |||
1947 | Succs.push_back(SDB->SwitchCases[i].TrueBB); | |||
1948 | if (SDB->SwitchCases[i].TrueBB != SDB->SwitchCases[i].FalseBB) | |||
1949 | Succs.push_back(SDB->SwitchCases[i].FalseBB); | |||
1950 | ||||
1951 | // Emit the code. Note that this could result in FuncInfo->MBB being split. | |||
1952 | SDB->visitSwitchCase(SDB->SwitchCases[i], FuncInfo->MBB); | |||
1953 | CurDAG->setRoot(SDB->getRoot()); | |||
1954 | SDB->clear(); | |||
1955 | CodeGenAndEmitDAG(); | |||
1956 | ||||
1957 | // Remember the last block, now that any splitting is done, for use in | |||
1958 | // populating PHI nodes in successors. | |||
1959 | MachineBasicBlock *ThisBB = FuncInfo->MBB; | |||
1960 | ||||
1961 | // Handle any PHI nodes in successors of this chunk, as if we were coming | |||
1962 | // from the original BB before switch expansion. Note that PHI nodes can | |||
1963 | // occur multiple times in PHINodesToUpdate. We have to be very careful to | |||
1964 | // handle them the right number of times. | |||
1965 | for (unsigned i = 0, e = Succs.size(); i != e; ++i) { | |||
1966 | FuncInfo->MBB = Succs[i]; | |||
1967 | FuncInfo->InsertPt = FuncInfo->MBB->end(); | |||
1968 | // FuncInfo->MBB may have been removed from the CFG if a branch was | |||
1969 | // constant folded. | |||
1970 | if (ThisBB->isSuccessor(FuncInfo->MBB)) { | |||
1971 | for (MachineBasicBlock::iterator | |||
1972 | MBBI = FuncInfo->MBB->begin(), MBBE = FuncInfo->MBB->end(); | |||
1973 | MBBI != MBBE && MBBI->isPHI(); ++MBBI) { | |||
1974 | MachineInstrBuilder PHI(*MF, MBBI); | |||
1975 | // This value for this PHI node is recorded in PHINodesToUpdate. | |||
1976 | for (unsigned pn = 0; ; ++pn) { | |||
1977 | assert(pn != FuncInfo->PHINodesToUpdate.size() &&(static_cast <bool> (pn != FuncInfo->PHINodesToUpdate .size() && "Didn't find PHI entry!") ? void (0) : __assert_fail ("pn != FuncInfo->PHINodesToUpdate.size() && \"Didn't find PHI entry!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1978, __extension__ __PRETTY_FUNCTION__)) | |||
1978 | "Didn't find PHI entry!")(static_cast <bool> (pn != FuncInfo->PHINodesToUpdate .size() && "Didn't find PHI entry!") ? void (0) : __assert_fail ("pn != FuncInfo->PHINodesToUpdate.size() && \"Didn't find PHI entry!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 1978, __extension__ __PRETTY_FUNCTION__)); | |||
1979 | if (FuncInfo->PHINodesToUpdate[pn].first == PHI) { | |||
1980 | PHI.addReg(FuncInfo->PHINodesToUpdate[pn].second).addMBB(ThisBB); | |||
1981 | break; | |||
1982 | } | |||
1983 | } | |||
1984 | } | |||
1985 | } | |||
1986 | } | |||
1987 | } | |||
1988 | SDB->SwitchCases.clear(); | |||
1989 | } | |||
1990 | ||||
1991 | /// Create the scheduler. If a specific scheduler was specified | |||
1992 | /// via the SchedulerRegistry, use it, otherwise select the | |||
1993 | /// one preferred by the target. | |||
1994 | /// | |||
1995 | ScheduleDAGSDNodes *SelectionDAGISel::CreateScheduler() { | |||
1996 | return ISHeuristic(this, OptLevel); | |||
1997 | } | |||
1998 | ||||
1999 | //===----------------------------------------------------------------------===// | |||
2000 | // Helper functions used by the generated instruction selector. | |||
2001 | //===----------------------------------------------------------------------===// | |||
2002 | // Calls to these methods are generated by tblgen. | |||
2003 | ||||
2004 | /// CheckAndMask - The isel is trying to match something like (and X, 255). If | |||
2005 | /// the dag combiner simplified the 255, we still want to match. RHS is the | |||
2006 | /// actual value in the DAG on the RHS of an AND, and DesiredMaskS is the value | |||
2007 | /// specified in the .td file (e.g. 255). | |||
2008 | bool SelectionDAGISel::CheckAndMask(SDValue LHS, ConstantSDNode *RHS, | |||
2009 | int64_t DesiredMaskS) const { | |||
2010 | const APInt &ActualMask = RHS->getAPIntValue(); | |||
2011 | const APInt &DesiredMask = APInt(LHS.getValueSizeInBits(), DesiredMaskS); | |||
2012 | ||||
2013 | // If the actual mask exactly matches, success! | |||
2014 | if (ActualMask == DesiredMask) | |||
2015 | return true; | |||
2016 | ||||
2017 | // If the actual AND mask is allowing unallowed bits, this doesn't match. | |||
2018 | if (ActualMask.intersects(~DesiredMask)) | |||
2019 | return false; | |||
2020 | ||||
2021 | // Otherwise, the DAG Combiner may have proven that the value coming in is | |||
2022 | // either already zero or is not demanded. Check for known zero input bits. | |||
2023 | APInt NeededMask = DesiredMask & ~ActualMask; | |||
2024 | if (CurDAG->MaskedValueIsZero(LHS, NeededMask)) | |||
2025 | return true; | |||
2026 | ||||
2027 | // TODO: check to see if missing bits are just not demanded. | |||
2028 | ||||
2029 | // Otherwise, this pattern doesn't match. | |||
2030 | return false; | |||
2031 | } | |||
2032 | ||||
2033 | /// CheckOrMask - The isel is trying to match something like (or X, 255). If | |||
2034 | /// the dag combiner simplified the 255, we still want to match. RHS is the | |||
2035 | /// actual value in the DAG on the RHS of an OR, and DesiredMaskS is the value | |||
2036 | /// specified in the .td file (e.g. 255). | |||
2037 | bool SelectionDAGISel::CheckOrMask(SDValue LHS, ConstantSDNode *RHS, | |||
2038 | int64_t DesiredMaskS) const { | |||
2039 | const APInt &ActualMask = RHS->getAPIntValue(); | |||
2040 | const APInt &DesiredMask = APInt(LHS.getValueSizeInBits(), DesiredMaskS); | |||
2041 | ||||
2042 | // If the actual mask exactly matches, success! | |||
2043 | if (ActualMask == DesiredMask) | |||
2044 | return true; | |||
2045 | ||||
2046 | // If the actual AND mask is allowing unallowed bits, this doesn't match. | |||
2047 | if (ActualMask.intersects(~DesiredMask)) | |||
2048 | return false; | |||
2049 | ||||
2050 | // Otherwise, the DAG Combiner may have proven that the value coming in is | |||
2051 | // either already zero or is not demanded. Check for known zero input bits. | |||
2052 | APInt NeededMask = DesiredMask & ~ActualMask; | |||
2053 | ||||
2054 | KnownBits Known; | |||
2055 | CurDAG->computeKnownBits(LHS, Known); | |||
2056 | ||||
2057 | // If all the missing bits in the or are already known to be set, match! | |||
2058 | if (NeededMask.isSubsetOf(Known.One)) | |||
2059 | return true; | |||
2060 | ||||
2061 | // TODO: check to see if missing bits are just not demanded. | |||
2062 | ||||
2063 | // Otherwise, this pattern doesn't match. | |||
2064 | return false; | |||
2065 | } | |||
2066 | ||||
2067 | /// SelectInlineAsmMemoryOperands - Calls to this are automatically generated | |||
2068 | /// by tblgen. Others should not call it. | |||
2069 | void SelectionDAGISel::SelectInlineAsmMemoryOperands(std::vector<SDValue> &Ops, | |||
2070 | const SDLoc &DL) { | |||
2071 | std::vector<SDValue> InOps; | |||
2072 | std::swap(InOps, Ops); | |||
2073 | ||||
2074 | Ops.push_back(InOps[InlineAsm::Op_InputChain]); // 0 | |||
2075 | Ops.push_back(InOps[InlineAsm::Op_AsmString]); // 1 | |||
2076 | Ops.push_back(InOps[InlineAsm::Op_MDNode]); // 2, !srcloc | |||
2077 | Ops.push_back(InOps[InlineAsm::Op_ExtraInfo]); // 3 (SideEffect, AlignStack) | |||
2078 | ||||
2079 | unsigned i = InlineAsm::Op_FirstOperand, e = InOps.size(); | |||
2080 | if (InOps[e-1].getValueType() == MVT::Glue) | |||
2081 | --e; // Don't process a glue operand if it is here. | |||
2082 | ||||
2083 | while (i != e) { | |||
2084 | unsigned Flags = cast<ConstantSDNode>(InOps[i])->getZExtValue(); | |||
2085 | if (!InlineAsm::isMemKind(Flags)) { | |||
2086 | // Just skip over this operand, copying the operands verbatim. | |||
2087 | Ops.insert(Ops.end(), InOps.begin()+i, | |||
2088 | InOps.begin()+i+InlineAsm::getNumOperandRegisters(Flags) + 1); | |||
2089 | i += InlineAsm::getNumOperandRegisters(Flags) + 1; | |||
2090 | } else { | |||
2091 | assert(InlineAsm::getNumOperandRegisters(Flags) == 1 &&(static_cast <bool> (InlineAsm::getNumOperandRegisters( Flags) == 1 && "Memory operand with multiple values?" ) ? void (0) : __assert_fail ("InlineAsm::getNumOperandRegisters(Flags) == 1 && \"Memory operand with multiple values?\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2092, __extension__ __PRETTY_FUNCTION__)) | |||
2092 | "Memory operand with multiple values?")(static_cast <bool> (InlineAsm::getNumOperandRegisters( Flags) == 1 && "Memory operand with multiple values?" ) ? void (0) : __assert_fail ("InlineAsm::getNumOperandRegisters(Flags) == 1 && \"Memory operand with multiple values?\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2092, __extension__ __PRETTY_FUNCTION__)); | |||
2093 | ||||
2094 | unsigned TiedToOperand; | |||
2095 | if (InlineAsm::isUseOperandTiedToDef(Flags, TiedToOperand)) { | |||
2096 | // We need the constraint ID from the operand this is tied to. | |||
2097 | unsigned CurOp = InlineAsm::Op_FirstOperand; | |||
2098 | Flags = cast<ConstantSDNode>(InOps[CurOp])->getZExtValue(); | |||
2099 | for (; TiedToOperand; --TiedToOperand) { | |||
2100 | CurOp += InlineAsm::getNumOperandRegisters(Flags)+1; | |||
2101 | Flags = cast<ConstantSDNode>(InOps[CurOp])->getZExtValue(); | |||
2102 | } | |||
2103 | } | |||
2104 | ||||
2105 | // Otherwise, this is a memory operand. Ask the target to select it. | |||
2106 | std::vector<SDValue> SelOps; | |||
2107 | unsigned ConstraintID = InlineAsm::getMemoryConstraintID(Flags); | |||
2108 | if (SelectInlineAsmMemoryOperand(InOps[i+1], ConstraintID, SelOps)) | |||
2109 | report_fatal_error("Could not match memory address. Inline asm" | |||
2110 | " failure!"); | |||
2111 | ||||
2112 | // Add this to the output node. | |||
2113 | unsigned NewFlags = | |||
2114 | InlineAsm::getFlagWord(InlineAsm::Kind_Mem, SelOps.size()); | |||
2115 | NewFlags = InlineAsm::getFlagWordForMem(NewFlags, ConstraintID); | |||
2116 | Ops.push_back(CurDAG->getTargetConstant(NewFlags, DL, MVT::i32)); | |||
2117 | Ops.insert(Ops.end(), SelOps.begin(), SelOps.end()); | |||
2118 | i += 2; | |||
2119 | } | |||
2120 | } | |||
2121 | ||||
2122 | // Add the glue input back if present. | |||
2123 | if (e != InOps.size()) | |||
2124 | Ops.push_back(InOps.back()); | |||
2125 | } | |||
2126 | ||||
2127 | /// findGlueUse - Return use of MVT::Glue value produced by the specified | |||
2128 | /// SDNode. | |||
2129 | /// | |||
2130 | static SDNode *findGlueUse(SDNode *N) { | |||
2131 | unsigned FlagResNo = N->getNumValues()-1; | |||
2132 | for (SDNode::use_iterator I = N->use_begin(), E = N->use_end(); I != E; ++I) { | |||
2133 | SDUse &Use = I.getUse(); | |||
2134 | if (Use.getResNo() == FlagResNo) | |||
2135 | return Use.getUser(); | |||
2136 | } | |||
2137 | return nullptr; | |||
2138 | } | |||
2139 | ||||
2140 | /// findNonImmUse - Return true if "Use" is a non-immediate use of "Def". | |||
2141 | /// This function iteratively traverses up the operand chain, ignoring | |||
2142 | /// certain nodes. | |||
2143 | static bool findNonImmUse(SDNode *Use, SDNode* Def, SDNode *ImmedUse, | |||
2144 | SDNode *Root, SmallPtrSetImpl<SDNode*> &Visited, | |||
2145 | bool IgnoreChains) { | |||
2146 | // The NodeID's are given uniques ID's where a node ID is guaranteed to be | |||
2147 | // greater than all of its (recursive) operands. If we scan to a point where | |||
2148 | // 'use' is smaller than the node we're scanning for, then we know we will | |||
2149 | // never find it. | |||
2150 | // | |||
2151 | // The Use may be -1 (unassigned) if it is a newly allocated node. This can | |||
2152 | // happen because we scan down to newly selected nodes in the case of glue | |||
2153 | // uses. | |||
2154 | std::vector<SDNode *> WorkList; | |||
2155 | WorkList.push_back(Use); | |||
2156 | ||||
2157 | while (!WorkList.empty()) { | |||
2158 | Use = WorkList.back(); | |||
2159 | WorkList.pop_back(); | |||
2160 | // NodeId topological order of TokenFactors is not guaranteed. Do not skip. | |||
2161 | if (Use->getOpcode() != ISD::TokenFactor && | |||
2162 | Use->getNodeId() < Def->getNodeId() && Use->getNodeId() != -1) | |||
2163 | continue; | |||
2164 | ||||
2165 | // Don't revisit nodes if we already scanned it and didn't fail, we know we | |||
2166 | // won't fail if we scan it again. | |||
2167 | if (!Visited.insert(Use).second) | |||
2168 | continue; | |||
2169 | ||||
2170 | for (const SDValue &Op : Use->op_values()) { | |||
2171 | // Ignore chain uses, they are validated by HandleMergeInputChains. | |||
2172 | if (Op.getValueType() == MVT::Other && IgnoreChains) | |||
2173 | continue; | |||
2174 | ||||
2175 | SDNode *N = Op.getNode(); | |||
2176 | if (N == Def) { | |||
2177 | if (Use == ImmedUse || Use == Root) | |||
2178 | continue; // We are not looking for immediate use. | |||
2179 | assert(N != Root)(static_cast <bool> (N != Root) ? void (0) : __assert_fail ("N != Root", "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2179, __extension__ __PRETTY_FUNCTION__)); | |||
2180 | return true; | |||
2181 | } | |||
2182 | ||||
2183 | // Traverse up the operand chain. | |||
2184 | WorkList.push_back(N); | |||
2185 | } | |||
2186 | } | |||
2187 | return false; | |||
2188 | } | |||
2189 | ||||
2190 | /// IsProfitableToFold - Returns true if it's profitable to fold the specific | |||
2191 | /// operand node N of U during instruction selection that starts at Root. | |||
2192 | bool SelectionDAGISel::IsProfitableToFold(SDValue N, SDNode *U, | |||
2193 | SDNode *Root) const { | |||
2194 | if (OptLevel == CodeGenOpt::None) return false; | |||
2195 | return N.hasOneUse(); | |||
2196 | } | |||
2197 | ||||
2198 | /// IsLegalToFold - Returns true if the specific operand node N of | |||
2199 | /// U can be folded during instruction selection that starts at Root. | |||
2200 | bool SelectionDAGISel::IsLegalToFold(SDValue N, SDNode *U, SDNode *Root, | |||
2201 | CodeGenOpt::Level OptLevel, | |||
2202 | bool IgnoreChains) { | |||
2203 | if (OptLevel == CodeGenOpt::None) return false; | |||
2204 | ||||
2205 | // If Root use can somehow reach N through a path that that doesn't contain | |||
2206 | // U then folding N would create a cycle. e.g. In the following | |||
2207 | // diagram, Root can reach N through X. If N is folded into into Root, then | |||
2208 | // X is both a predecessor and a successor of U. | |||
2209 | // | |||
2210 | // [N*] // | |||
2211 | // ^ ^ // | |||
2212 | // / \ // | |||
2213 | // [U*] [X]? // | |||
2214 | // ^ ^ // | |||
2215 | // \ / // | |||
2216 | // \ / // | |||
2217 | // [Root*] // | |||
2218 | // | |||
2219 | // * indicates nodes to be folded together. | |||
2220 | // | |||
2221 | // If Root produces glue, then it gets (even more) interesting. Since it | |||
2222 | // will be "glued" together with its glue use in the scheduler, we need to | |||
2223 | // check if it might reach N. | |||
2224 | // | |||
2225 | // [N*] // | |||
2226 | // ^ ^ // | |||
2227 | // / \ // | |||
2228 | // [U*] [X]? // | |||
2229 | // ^ ^ // | |||
2230 | // \ \ // | |||
2231 | // \ | // | |||
2232 | // [Root*] | // | |||
2233 | // ^ | // | |||
2234 | // f | // | |||
2235 | // | / // | |||
2236 | // [Y] / // | |||
2237 | // ^ / // | |||
2238 | // f / // | |||
2239 | // | / // | |||
2240 | // [GU] // | |||
2241 | // | |||
2242 | // If GU (glue use) indirectly reaches N (the load), and Root folds N | |||
2243 | // (call it Fold), then X is a predecessor of GU and a successor of | |||
2244 | // Fold. But since Fold and GU are glued together, this will create | |||
2245 | // a cycle in the scheduling graph. | |||
2246 | ||||
2247 | // If the node has glue, walk down the graph to the "lowest" node in the | |||
2248 | // glueged set. | |||
2249 | EVT VT = Root->getValueType(Root->getNumValues()-1); | |||
2250 | while (VT == MVT::Glue) { | |||
2251 | SDNode *GU = findGlueUse(Root); | |||
2252 | if (!GU) | |||
2253 | break; | |||
2254 | Root = GU; | |||
2255 | VT = Root->getValueType(Root->getNumValues()-1); | |||
2256 | ||||
2257 | // If our query node has a glue result with a use, we've walked up it. If | |||
2258 | // the user (which has already been selected) has a chain or indirectly uses | |||
2259 | // the chain, our WalkChainUsers predicate will not consider it. Because of | |||
2260 | // this, we cannot ignore chains in this predicate. | |||
2261 | IgnoreChains = false; | |||
2262 | } | |||
2263 | ||||
2264 | SmallPtrSet<SDNode*, 16> Visited; | |||
2265 | return !findNonImmUse(Root, N.getNode(), U, Root, Visited, IgnoreChains); | |||
2266 | } | |||
2267 | ||||
2268 | void SelectionDAGISel::Select_INLINEASM(SDNode *N) { | |||
2269 | SDLoc DL(N); | |||
2270 | ||||
2271 | std::vector<SDValue> Ops(N->op_begin(), N->op_end()); | |||
2272 | SelectInlineAsmMemoryOperands(Ops, DL); | |||
2273 | ||||
2274 | const EVT VTs[] = {MVT::Other, MVT::Glue}; | |||
2275 | SDValue New = CurDAG->getNode(ISD::INLINEASM, DL, VTs, Ops); | |||
2276 | New->setNodeId(-1); | |||
2277 | ReplaceUses(N, New.getNode()); | |||
2278 | CurDAG->RemoveDeadNode(N); | |||
2279 | } | |||
2280 | ||||
2281 | void SelectionDAGISel::Select_READ_REGISTER(SDNode *Op) { | |||
2282 | SDLoc dl(Op); | |||
2283 | MDNodeSDNode *MD = dyn_cast<MDNodeSDNode>(Op->getOperand(1)); | |||
2284 | const MDString *RegStr = dyn_cast<MDString>(MD->getMD()->getOperand(0)); | |||
2285 | unsigned Reg = | |||
2286 | TLI->getRegisterByName(RegStr->getString().data(), Op->getValueType(0), | |||
2287 | *CurDAG); | |||
2288 | SDValue New = CurDAG->getCopyFromReg( | |||
2289 | Op->getOperand(0), dl, Reg, Op->getValueType(0)); | |||
2290 | New->setNodeId(-1); | |||
2291 | ReplaceUses(Op, New.getNode()); | |||
2292 | CurDAG->RemoveDeadNode(Op); | |||
2293 | } | |||
2294 | ||||
2295 | void SelectionDAGISel::Select_WRITE_REGISTER(SDNode *Op) { | |||
2296 | SDLoc dl(Op); | |||
2297 | MDNodeSDNode *MD = dyn_cast<MDNodeSDNode>(Op->getOperand(1)); | |||
2298 | const MDString *RegStr = dyn_cast<MDString>(MD->getMD()->getOperand(0)); | |||
2299 | unsigned Reg = TLI->getRegisterByName(RegStr->getString().data(), | |||
2300 | Op->getOperand(2).getValueType(), | |||
2301 | *CurDAG); | |||
2302 | SDValue New = CurDAG->getCopyToReg( | |||
2303 | Op->getOperand(0), dl, Reg, Op->getOperand(2)); | |||
2304 | New->setNodeId(-1); | |||
2305 | ReplaceUses(Op, New.getNode()); | |||
2306 | CurDAG->RemoveDeadNode(Op); | |||
2307 | } | |||
2308 | ||||
2309 | void SelectionDAGISel::Select_UNDEF(SDNode *N) { | |||
2310 | CurDAG->SelectNodeTo(N, TargetOpcode::IMPLICIT_DEF, N->getValueType(0)); | |||
2311 | } | |||
2312 | ||||
2313 | /// GetVBR - decode a vbr encoding whose top bit is set. | |||
2314 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline uint64_t | |||
2315 | GetVBR(uint64_t Val, const unsigned char *MatcherTable, unsigned &Idx) { | |||
2316 | assert(Val >= 128 && "Not a VBR")(static_cast <bool> (Val >= 128 && "Not a VBR" ) ? void (0) : __assert_fail ("Val >= 128 && \"Not a VBR\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2316, __extension__ __PRETTY_FUNCTION__)); | |||
2317 | Val &= 127; // Remove first vbr bit. | |||
2318 | ||||
2319 | unsigned Shift = 7; | |||
2320 | uint64_t NextBits; | |||
2321 | do { | |||
2322 | NextBits = MatcherTable[Idx++]; | |||
2323 | Val |= (NextBits&127) << Shift; | |||
2324 | Shift += 7; | |||
2325 | } while (NextBits & 128); | |||
2326 | ||||
2327 | return Val; | |||
2328 | } | |||
2329 | ||||
2330 | /// When a match is complete, this method updates uses of interior chain results | |||
2331 | /// to use the new results. | |||
2332 | void SelectionDAGISel::UpdateChains( | |||
2333 | SDNode *NodeToMatch, SDValue InputChain, | |||
2334 | SmallVectorImpl<SDNode *> &ChainNodesMatched, bool isMorphNodeTo) { | |||
2335 | SmallVector<SDNode*, 4> NowDeadNodes; | |||
2336 | ||||
2337 | // Now that all the normal results are replaced, we replace the chain and | |||
2338 | // glue results if present. | |||
2339 | if (!ChainNodesMatched.empty()) { | |||
2340 | assert(InputChain.getNode() &&(static_cast <bool> (InputChain.getNode() && "Matched input chains but didn't produce a chain" ) ? void (0) : __assert_fail ("InputChain.getNode() && \"Matched input chains but didn't produce a chain\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2341, __extension__ __PRETTY_FUNCTION__)) | |||
2341 | "Matched input chains but didn't produce a chain")(static_cast <bool> (InputChain.getNode() && "Matched input chains but didn't produce a chain" ) ? void (0) : __assert_fail ("InputChain.getNode() && \"Matched input chains but didn't produce a chain\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2341, __extension__ __PRETTY_FUNCTION__)); | |||
2342 | // Loop over all of the nodes we matched that produced a chain result. | |||
2343 | // Replace all the chain results with the final chain we ended up with. | |||
2344 | for (unsigned i = 0, e = ChainNodesMatched.size(); i != e; ++i) { | |||
2345 | SDNode *ChainNode = ChainNodesMatched[i]; | |||
2346 | // If ChainNode is null, it's because we replaced it on a previous | |||
2347 | // iteration and we cleared it out of the map. Just skip it. | |||
2348 | if (!ChainNode) | |||
2349 | continue; | |||
2350 | ||||
2351 | assert(ChainNode->getOpcode() != ISD::DELETED_NODE &&(static_cast <bool> (ChainNode->getOpcode() != ISD:: DELETED_NODE && "Deleted node left in chain") ? void ( 0) : __assert_fail ("ChainNode->getOpcode() != ISD::DELETED_NODE && \"Deleted node left in chain\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2352, __extension__ __PRETTY_FUNCTION__)) | |||
2352 | "Deleted node left in chain")(static_cast <bool> (ChainNode->getOpcode() != ISD:: DELETED_NODE && "Deleted node left in chain") ? void ( 0) : __assert_fail ("ChainNode->getOpcode() != ISD::DELETED_NODE && \"Deleted node left in chain\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2352, __extension__ __PRETTY_FUNCTION__)); | |||
2353 | ||||
2354 | // Don't replace the results of the root node if we're doing a | |||
2355 | // MorphNodeTo. | |||
2356 | if (ChainNode == NodeToMatch && isMorphNodeTo) | |||
2357 | continue; | |||
2358 | ||||
2359 | SDValue ChainVal = SDValue(ChainNode, ChainNode->getNumValues()-1); | |||
2360 | if (ChainVal.getValueType() == MVT::Glue) | |||
2361 | ChainVal = ChainVal.getValue(ChainVal->getNumValues()-2); | |||
2362 | assert(ChainVal.getValueType() == MVT::Other && "Not a chain?")(static_cast <bool> (ChainVal.getValueType() == MVT::Other && "Not a chain?") ? void (0) : __assert_fail ("ChainVal.getValueType() == MVT::Other && \"Not a chain?\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2362, __extension__ __PRETTY_FUNCTION__)); | |||
2363 | SelectionDAG::DAGNodeDeletedListener NDL( | |||
2364 | *CurDAG, [&](SDNode *N, SDNode *E) { | |||
2365 | std::replace(ChainNodesMatched.begin(), ChainNodesMatched.end(), N, | |||
2366 | static_cast<SDNode *>(nullptr)); | |||
2367 | }); | |||
2368 | if (ChainNode->getOpcode() != ISD::TokenFactor) | |||
2369 | CurDAG->ReplaceAllUsesOfValueWith(ChainVal, InputChain); | |||
2370 | ||||
2371 | // If the node became dead and we haven't already seen it, delete it. | |||
2372 | if (ChainNode != NodeToMatch && ChainNode->use_empty() && | |||
2373 | !std::count(NowDeadNodes.begin(), NowDeadNodes.end(), ChainNode)) | |||
2374 | NowDeadNodes.push_back(ChainNode); | |||
2375 | } | |||
2376 | } | |||
2377 | ||||
2378 | if (!NowDeadNodes.empty()) | |||
2379 | CurDAG->RemoveDeadNodes(NowDeadNodes); | |||
2380 | ||||
2381 | DEBUG(dbgs() << "ISEL: Match complete!\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "ISEL: Match complete!\n"; } } while (false); | |||
2382 | } | |||
2383 | ||||
2384 | enum ChainResult { | |||
2385 | CR_Simple, | |||
2386 | CR_InducesCycle, | |||
2387 | CR_LeadsToInteriorNode | |||
2388 | }; | |||
2389 | ||||
2390 | /// WalkChainUsers - Walk down the users of the specified chained node that is | |||
2391 | /// part of the pattern we're matching, looking at all of the users we find. | |||
2392 | /// This determines whether something is an interior node, whether we have a | |||
2393 | /// non-pattern node in between two pattern nodes (which prevent folding because | |||
2394 | /// it would induce a cycle) and whether we have a TokenFactor node sandwiched | |||
2395 | /// between pattern nodes (in which case the TF becomes part of the pattern). | |||
2396 | /// | |||
2397 | /// The walk we do here is guaranteed to be small because we quickly get down to | |||
2398 | /// already selected nodes "below" us. | |||
2399 | static ChainResult | |||
2400 | WalkChainUsers(const SDNode *ChainedNode, | |||
2401 | SmallVectorImpl<SDNode *> &ChainedNodesInPattern, | |||
2402 | DenseMap<const SDNode *, ChainResult> &TokenFactorResult, | |||
2403 | SmallVectorImpl<SDNode *> &InteriorChainedNodes) { | |||
2404 | ChainResult Result = CR_Simple; | |||
2405 | ||||
2406 | for (SDNode::use_iterator UI = ChainedNode->use_begin(), | |||
2407 | E = ChainedNode->use_end(); UI != E; ++UI) { | |||
2408 | // Make sure the use is of the chain, not some other value we produce. | |||
2409 | if (UI.getUse().getValueType() != MVT::Other) continue; | |||
2410 | ||||
2411 | SDNode *User = *UI; | |||
2412 | ||||
2413 | if (User->getOpcode() == ISD::HANDLENODE) // Root of the graph. | |||
2414 | continue; | |||
2415 | ||||
2416 | // If we see an already-selected machine node, then we've gone beyond the | |||
2417 | // pattern that we're selecting down into the already selected chunk of the | |||
2418 | // DAG. | |||
2419 | unsigned UserOpcode = User->getOpcode(); | |||
2420 | if (User->isMachineOpcode() || | |||
2421 | UserOpcode == ISD::CopyToReg || | |||
2422 | UserOpcode == ISD::CopyFromReg || | |||
2423 | UserOpcode == ISD::INLINEASM || | |||
2424 | UserOpcode == ISD::EH_LABEL || | |||
2425 | UserOpcode == ISD::LIFETIME_START || | |||
2426 | UserOpcode == ISD::LIFETIME_END) { | |||
2427 | // If their node ID got reset to -1 then they've already been selected. | |||
2428 | // Treat them like a MachineOpcode. | |||
2429 | if (User->getNodeId() == -1) | |||
2430 | continue; | |||
2431 | } | |||
2432 | ||||
2433 | // If we have a TokenFactor, we handle it specially. | |||
2434 | if (User->getOpcode() != ISD::TokenFactor) { | |||
2435 | // If the node isn't a token factor and isn't part of our pattern, then it | |||
2436 | // must be a random chained node in between two nodes we're selecting. | |||
2437 | // This happens when we have something like: | |||
2438 | // x = load ptr | |||
2439 | // call | |||
2440 | // y = x+4 | |||
2441 | // store y -> ptr | |||
2442 | // Because we structurally match the load/store as a read/modify/write, | |||
2443 | // but the call is chained between them. We cannot fold in this case | |||
2444 | // because it would induce a cycle in the graph. | |||
2445 | if (!std::count(ChainedNodesInPattern.begin(), | |||
2446 | ChainedNodesInPattern.end(), User)) | |||
2447 | return CR_InducesCycle; | |||
2448 | ||||
2449 | // Otherwise we found a node that is part of our pattern. For example in: | |||
2450 | // x = load ptr | |||
2451 | // y = x+4 | |||
2452 | // store y -> ptr | |||
2453 | // This would happen when we're scanning down from the load and see the | |||
2454 | // store as a user. Record that there is a use of ChainedNode that is | |||
2455 | // part of the pattern and keep scanning uses. | |||
2456 | Result = CR_LeadsToInteriorNode; | |||
2457 | InteriorChainedNodes.push_back(User); | |||
2458 | continue; | |||
2459 | } | |||
2460 | ||||
2461 | // If we found a TokenFactor, there are two cases to consider: first if the | |||
2462 | // TokenFactor is just hanging "below" the pattern we're matching (i.e. no | |||
2463 | // uses of the TF are in our pattern) we just want to ignore it. Second, | |||
2464 | // the TokenFactor can be sandwiched in between two chained nodes, like so: | |||
2465 | // [Load chain] | |||
2466 | // ^ | |||
2467 | // | | |||
2468 | // [Load] | |||
2469 | // ^ ^ | |||
2470 | // | \ DAG's like cheese | |||
2471 | // / \ do you? | |||
2472 | // / | | |||
2473 | // [TokenFactor] [Op] | |||
2474 | // ^ ^ | |||
2475 | // | | | |||
2476 | // \ / | |||
2477 | // \ / | |||
2478 | // [Store] | |||
2479 | // | |||
2480 | // In this case, the TokenFactor becomes part of our match and we rewrite it | |||
2481 | // as a new TokenFactor. | |||
2482 | // | |||
2483 | // To distinguish these two cases, do a recursive walk down the uses. | |||
2484 | auto MemoizeResult = TokenFactorResult.find(User); | |||
2485 | bool Visited = MemoizeResult != TokenFactorResult.end(); | |||
2486 | // Recursively walk chain users only if the result is not memoized. | |||
2487 | if (!Visited) { | |||
2488 | auto Res = WalkChainUsers(User, ChainedNodesInPattern, TokenFactorResult, | |||
2489 | InteriorChainedNodes); | |||
2490 | MemoizeResult = TokenFactorResult.insert(std::make_pair(User, Res)).first; | |||
2491 | } | |||
2492 | switch (MemoizeResult->second) { | |||
2493 | case CR_Simple: | |||
2494 | // If the uses of the TokenFactor are just already-selected nodes, ignore | |||
2495 | // it, it is "below" our pattern. | |||
2496 | continue; | |||
2497 | case CR_InducesCycle: | |||
2498 | // If the uses of the TokenFactor lead to nodes that are not part of our | |||
2499 | // pattern that are not selected, folding would turn this into a cycle, | |||
2500 | // bail out now. | |||
2501 | return CR_InducesCycle; | |||
2502 | case CR_LeadsToInteriorNode: | |||
2503 | break; // Otherwise, keep processing. | |||
2504 | } | |||
2505 | ||||
2506 | // Okay, we know we're in the interesting interior case. The TokenFactor | |||
2507 | // is now going to be considered part of the pattern so that we rewrite its | |||
2508 | // uses (it may have uses that are not part of the pattern) with the | |||
2509 | // ultimate chain result of the generated code. We will also add its chain | |||
2510 | // inputs as inputs to the ultimate TokenFactor we create. | |||
2511 | Result = CR_LeadsToInteriorNode; | |||
2512 | if (!Visited) { | |||
2513 | ChainedNodesInPattern.push_back(User); | |||
2514 | InteriorChainedNodes.push_back(User); | |||
2515 | } | |||
2516 | } | |||
2517 | ||||
2518 | return Result; | |||
2519 | } | |||
2520 | ||||
2521 | /// HandleMergeInputChains - This implements the OPC_EmitMergeInputChains | |||
2522 | /// operation for when the pattern matched at least one node with a chains. The | |||
2523 | /// input vector contains a list of all of the chained nodes that we match. We | |||
2524 | /// must determine if this is a valid thing to cover (i.e. matching it won't | |||
2525 | /// induce cycles in the DAG) and if so, creating a TokenFactor node. that will | |||
2526 | /// be used as the input node chain for the generated nodes. | |||
2527 | static SDValue | |||
2528 | HandleMergeInputChains(SmallVectorImpl<SDNode*> &ChainNodesMatched, | |||
2529 | SelectionDAG *CurDAG) { | |||
2530 | // Used for memoization. Without it WalkChainUsers could take exponential | |||
2531 | // time to run. | |||
2532 | DenseMap<const SDNode *, ChainResult> TokenFactorResult; | |||
2533 | // Walk all of the chained nodes we've matched, recursively scanning down the | |||
2534 | // users of the chain result. This adds any TokenFactor nodes that are caught | |||
2535 | // in between chained nodes to the chained and interior nodes list. | |||
2536 | SmallVector<SDNode*, 3> InteriorChainedNodes; | |||
2537 | for (unsigned i = 0, e = ChainNodesMatched.size(); i != e; ++i) { | |||
2538 | if (WalkChainUsers(ChainNodesMatched[i], ChainNodesMatched, | |||
2539 | TokenFactorResult, | |||
2540 | InteriorChainedNodes) == CR_InducesCycle) | |||
2541 | return SDValue(); // Would induce a cycle. | |||
2542 | } | |||
2543 | ||||
2544 | // Okay, we have walked all the matched nodes and collected TokenFactor nodes | |||
2545 | // that we are interested in. Form our input TokenFactor node. | |||
2546 | SmallVector<SDValue, 3> InputChains; | |||
2547 | for (unsigned i = 0, e = ChainNodesMatched.size(); i != e; ++i) { | |||
2548 | // Add the input chain of this node to the InputChains list (which will be | |||
2549 | // the operands of the generated TokenFactor) if it's not an interior node. | |||
2550 | SDNode *N = ChainNodesMatched[i]; | |||
2551 | if (N->getOpcode() != ISD::TokenFactor) { | |||
2552 | if (std::count(InteriorChainedNodes.begin(),InteriorChainedNodes.end(),N)) | |||
2553 | continue; | |||
2554 | ||||
2555 | // Otherwise, add the input chain. | |||
2556 | SDValue InChain = ChainNodesMatched[i]->getOperand(0); | |||
2557 | assert(InChain.getValueType() == MVT::Other && "Not a chain")(static_cast <bool> (InChain.getValueType() == MVT::Other && "Not a chain") ? void (0) : __assert_fail ("InChain.getValueType() == MVT::Other && \"Not a chain\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2557, __extension__ __PRETTY_FUNCTION__)); | |||
2558 | InputChains.push_back(InChain); | |||
2559 | continue; | |||
2560 | } | |||
2561 | ||||
2562 | // If we have a token factor, we want to add all inputs of the token factor | |||
2563 | // that are not part of the pattern we're matching. | |||
2564 | for (const SDValue &Op : N->op_values()) { | |||
2565 | if (!std::count(ChainNodesMatched.begin(), ChainNodesMatched.end(), | |||
2566 | Op.getNode())) | |||
2567 | InputChains.push_back(Op); | |||
2568 | } | |||
2569 | } | |||
2570 | ||||
2571 | if (InputChains.size() == 1) | |||
2572 | return InputChains[0]; | |||
2573 | return CurDAG->getNode(ISD::TokenFactor, SDLoc(ChainNodesMatched[0]), | |||
2574 | MVT::Other, InputChains); | |||
2575 | } | |||
2576 | ||||
2577 | /// MorphNode - Handle morphing a node in place for the selector. | |||
2578 | SDNode *SelectionDAGISel:: | |||
2579 | MorphNode(SDNode *Node, unsigned TargetOpc, SDVTList VTList, | |||
2580 | ArrayRef<SDValue> Ops, unsigned EmitNodeInfo) { | |||
2581 | // It is possible we're using MorphNodeTo to replace a node with no | |||
2582 | // normal results with one that has a normal result (or we could be | |||
2583 | // adding a chain) and the input could have glue and chains as well. | |||
2584 | // In this case we need to shift the operands down. | |||
2585 | // FIXME: This is a horrible hack and broken in obscure cases, no worse | |||
2586 | // than the old isel though. | |||
2587 | int OldGlueResultNo = -1, OldChainResultNo = -1; | |||
2588 | ||||
2589 | unsigned NTMNumResults = Node->getNumValues(); | |||
2590 | if (Node->getValueType(NTMNumResults-1) == MVT::Glue) { | |||
2591 | OldGlueResultNo = NTMNumResults-1; | |||
2592 | if (NTMNumResults != 1 && | |||
2593 | Node->getValueType(NTMNumResults-2) == MVT::Other) | |||
2594 | OldChainResultNo = NTMNumResults-2; | |||
2595 | } else if (Node->getValueType(NTMNumResults-1) == MVT::Other) | |||
2596 | OldChainResultNo = NTMNumResults-1; | |||
2597 | ||||
2598 | // Call the underlying SelectionDAG routine to do the transmogrification. Note | |||
2599 | // that this deletes operands of the old node that become dead. | |||
2600 | SDNode *Res = CurDAG->MorphNodeTo(Node, ~TargetOpc, VTList, Ops); | |||
2601 | ||||
2602 | // MorphNodeTo can operate in two ways: if an existing node with the | |||
2603 | // specified operands exists, it can just return it. Otherwise, it | |||
2604 | // updates the node in place to have the requested operands. | |||
2605 | if (Res == Node) { | |||
2606 | // If we updated the node in place, reset the node ID. To the isel, | |||
2607 | // this should be just like a newly allocated machine node. | |||
2608 | Res->setNodeId(-1); | |||
2609 | } | |||
2610 | ||||
2611 | unsigned ResNumResults = Res->getNumValues(); | |||
2612 | // Move the glue if needed. | |||
2613 | if ((EmitNodeInfo & OPFL_GlueOutput) && OldGlueResultNo != -1 && | |||
2614 | (unsigned)OldGlueResultNo != ResNumResults-1) | |||
2615 | CurDAG->ReplaceAllUsesOfValueWith(SDValue(Node, OldGlueResultNo), | |||
2616 | SDValue(Res, ResNumResults-1)); | |||
2617 | ||||
2618 | if ((EmitNodeInfo & OPFL_GlueOutput) != 0) | |||
2619 | --ResNumResults; | |||
2620 | ||||
2621 | // Move the chain reference if needed. | |||
2622 | if ((EmitNodeInfo & OPFL_Chain) && OldChainResultNo != -1 && | |||
2623 | (unsigned)OldChainResultNo != ResNumResults-1) | |||
2624 | CurDAG->ReplaceAllUsesOfValueWith(SDValue(Node, OldChainResultNo), | |||
2625 | SDValue(Res, ResNumResults-1)); | |||
2626 | ||||
2627 | // Otherwise, no replacement happened because the node already exists. Replace | |||
2628 | // Uses of the old node with the new one. | |||
2629 | if (Res != Node) { | |||
2630 | CurDAG->ReplaceAllUsesWith(Node, Res); | |||
2631 | CurDAG->RemoveDeadNode(Node); | |||
2632 | } | |||
2633 | ||||
2634 | return Res; | |||
2635 | } | |||
2636 | ||||
2637 | /// CheckSame - Implements OP_CheckSame. | |||
2638 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2639 | CheckSame(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2640 | SDValue N, | |||
2641 | const SmallVectorImpl<std::pair<SDValue, SDNode*>> &RecordedNodes) { | |||
2642 | // Accept if it is exactly the same as a previously recorded node. | |||
2643 | unsigned RecNo = MatcherTable[MatcherIndex++]; | |||
2644 | assert(RecNo < RecordedNodes.size() && "Invalid CheckSame")(static_cast <bool> (RecNo < RecordedNodes.size() && "Invalid CheckSame") ? void (0) : __assert_fail ("RecNo < RecordedNodes.size() && \"Invalid CheckSame\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2644, __extension__ __PRETTY_FUNCTION__)); | |||
2645 | return N == RecordedNodes[RecNo].first; | |||
2646 | } | |||
2647 | ||||
2648 | /// CheckChildSame - Implements OP_CheckChildXSame. | |||
2649 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2650 | CheckChildSame(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2651 | SDValue N, | |||
2652 | const SmallVectorImpl<std::pair<SDValue, SDNode*>> &RecordedNodes, | |||
2653 | unsigned ChildNo) { | |||
2654 | if (ChildNo >= N.getNumOperands()) | |||
2655 | return false; // Match fails if out of range child #. | |||
2656 | return ::CheckSame(MatcherTable, MatcherIndex, N.getOperand(ChildNo), | |||
2657 | RecordedNodes); | |||
2658 | } | |||
2659 | ||||
2660 | /// CheckPatternPredicate - Implements OP_CheckPatternPredicate. | |||
2661 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2662 | CheckPatternPredicate(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2663 | const SelectionDAGISel &SDISel) { | |||
2664 | return SDISel.CheckPatternPredicate(MatcherTable[MatcherIndex++]); | |||
2665 | } | |||
2666 | ||||
2667 | /// CheckNodePredicate - Implements OP_CheckNodePredicate. | |||
2668 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2669 | CheckNodePredicate(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2670 | const SelectionDAGISel &SDISel, SDNode *N) { | |||
2671 | return SDISel.CheckNodePredicate(N, MatcherTable[MatcherIndex++]); | |||
2672 | } | |||
2673 | ||||
2674 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2675 | CheckOpcode(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2676 | SDNode *N) { | |||
2677 | uint16_t Opc = MatcherTable[MatcherIndex++]; | |||
2678 | Opc |= (unsigned short)MatcherTable[MatcherIndex++] << 8; | |||
2679 | return N->getOpcode() == Opc; | |||
2680 | } | |||
2681 | ||||
2682 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2683 | CheckType(const unsigned char *MatcherTable, unsigned &MatcherIndex, SDValue N, | |||
2684 | const TargetLowering *TLI, const DataLayout &DL) { | |||
2685 | MVT::SimpleValueType VT = (MVT::SimpleValueType)MatcherTable[MatcherIndex++]; | |||
2686 | if (N.getValueType() == VT) return true; | |||
2687 | ||||
2688 | // Handle the case when VT is iPTR. | |||
2689 | return VT == MVT::iPTR && N.getValueType() == TLI->getPointerTy(DL); | |||
2690 | } | |||
2691 | ||||
2692 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2693 | CheckChildType(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2694 | SDValue N, const TargetLowering *TLI, const DataLayout &DL, | |||
2695 | unsigned ChildNo) { | |||
2696 | if (ChildNo >= N.getNumOperands()) | |||
2697 | return false; // Match fails if out of range child #. | |||
2698 | return ::CheckType(MatcherTable, MatcherIndex, N.getOperand(ChildNo), TLI, | |||
2699 | DL); | |||
2700 | } | |||
2701 | ||||
2702 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2703 | CheckCondCode(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2704 | SDValue N) { | |||
2705 | return cast<CondCodeSDNode>(N)->get() == | |||
2706 | (ISD::CondCode)MatcherTable[MatcherIndex++]; | |||
2707 | } | |||
2708 | ||||
2709 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2710 | CheckValueType(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2711 | SDValue N, const TargetLowering *TLI, const DataLayout &DL) { | |||
2712 | MVT::SimpleValueType VT = (MVT::SimpleValueType)MatcherTable[MatcherIndex++]; | |||
2713 | if (cast<VTSDNode>(N)->getVT() == VT) | |||
2714 | return true; | |||
2715 | ||||
2716 | // Handle the case when VT is iPTR. | |||
2717 | return VT == MVT::iPTR && cast<VTSDNode>(N)->getVT() == TLI->getPointerTy(DL); | |||
2718 | } | |||
2719 | ||||
2720 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2721 | CheckInteger(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2722 | SDValue N) { | |||
2723 | int64_t Val = MatcherTable[MatcherIndex++]; | |||
2724 | if (Val & 128) | |||
2725 | Val = GetVBR(Val, MatcherTable, MatcherIndex); | |||
2726 | ||||
2727 | ConstantSDNode *C = dyn_cast<ConstantSDNode>(N); | |||
2728 | return C && C->getSExtValue() == Val; | |||
2729 | } | |||
2730 | ||||
2731 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2732 | CheckChildInteger(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2733 | SDValue N, unsigned ChildNo) { | |||
2734 | if (ChildNo >= N.getNumOperands()) | |||
2735 | return false; // Match fails if out of range child #. | |||
2736 | return ::CheckInteger(MatcherTable, MatcherIndex, N.getOperand(ChildNo)); | |||
2737 | } | |||
2738 | ||||
2739 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2740 | CheckAndImm(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2741 | SDValue N, const SelectionDAGISel &SDISel) { | |||
2742 | int64_t Val = MatcherTable[MatcherIndex++]; | |||
2743 | if (Val & 128) | |||
2744 | Val = GetVBR(Val, MatcherTable, MatcherIndex); | |||
2745 | ||||
2746 | if (N->getOpcode() != ISD::AND) return false; | |||
2747 | ||||
2748 | ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1)); | |||
2749 | return C && SDISel.CheckAndMask(N.getOperand(0), C, Val); | |||
2750 | } | |||
2751 | ||||
2752 | LLVM_ATTRIBUTE_ALWAYS_INLINE__attribute__((always_inline)) static inline bool | |||
2753 | CheckOrImm(const unsigned char *MatcherTable, unsigned &MatcherIndex, | |||
2754 | SDValue N, const SelectionDAGISel &SDISel) { | |||
2755 | int64_t Val = MatcherTable[MatcherIndex++]; | |||
2756 | if (Val & 128) | |||
2757 | Val = GetVBR(Val, MatcherTable, MatcherIndex); | |||
2758 | ||||
2759 | if (N->getOpcode() != ISD::OR) return false; | |||
2760 | ||||
2761 | ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1)); | |||
2762 | return C && SDISel.CheckOrMask(N.getOperand(0), C, Val); | |||
2763 | } | |||
2764 | ||||
2765 | /// IsPredicateKnownToFail - If we know how and can do so without pushing a | |||
2766 | /// scope, evaluate the current node. If the current predicate is known to | |||
2767 | /// fail, set Result=true and return anything. If the current predicate is | |||
2768 | /// known to pass, set Result=false and return the MatcherIndex to continue | |||
2769 | /// with. If the current predicate is unknown, set Result=false and return the | |||
2770 | /// MatcherIndex to continue with. | |||
2771 | static unsigned IsPredicateKnownToFail(const unsigned char *Table, | |||
2772 | unsigned Index, SDValue N, | |||
2773 | bool &Result, | |||
2774 | const SelectionDAGISel &SDISel, | |||
2775 | SmallVectorImpl<std::pair<SDValue, SDNode*>> &RecordedNodes) { | |||
2776 | switch (Table[Index++]) { | |||
2777 | default: | |||
2778 | Result = false; | |||
2779 | return Index-1; // Could not evaluate this predicate. | |||
2780 | case SelectionDAGISel::OPC_CheckSame: | |||
2781 | Result = !::CheckSame(Table, Index, N, RecordedNodes); | |||
2782 | return Index; | |||
2783 | case SelectionDAGISel::OPC_CheckChild0Same: | |||
2784 | case SelectionDAGISel::OPC_CheckChild1Same: | |||
2785 | case SelectionDAGISel::OPC_CheckChild2Same: | |||
2786 | case SelectionDAGISel::OPC_CheckChild3Same: | |||
2787 | Result = !::CheckChildSame(Table, Index, N, RecordedNodes, | |||
2788 | Table[Index-1] - SelectionDAGISel::OPC_CheckChild0Same); | |||
2789 | return Index; | |||
2790 | case SelectionDAGISel::OPC_CheckPatternPredicate: | |||
2791 | Result = !::CheckPatternPredicate(Table, Index, SDISel); | |||
2792 | return Index; | |||
2793 | case SelectionDAGISel::OPC_CheckPredicate: | |||
2794 | Result = !::CheckNodePredicate(Table, Index, SDISel, N.getNode()); | |||
2795 | return Index; | |||
2796 | case SelectionDAGISel::OPC_CheckOpcode: | |||
2797 | Result = !::CheckOpcode(Table, Index, N.getNode()); | |||
2798 | return Index; | |||
2799 | case SelectionDAGISel::OPC_CheckType: | |||
2800 | Result = !::CheckType(Table, Index, N, SDISel.TLI, | |||
2801 | SDISel.CurDAG->getDataLayout()); | |||
2802 | return Index; | |||
2803 | case SelectionDAGISel::OPC_CheckTypeRes: { | |||
2804 | unsigned Res = Table[Index++]; | |||
2805 | Result = !::CheckType(Table, Index, N.getValue(Res), SDISel.TLI, | |||
2806 | SDISel.CurDAG->getDataLayout()); | |||
2807 | return Index; | |||
2808 | } | |||
2809 | case SelectionDAGISel::OPC_CheckChild0Type: | |||
2810 | case SelectionDAGISel::OPC_CheckChild1Type: | |||
2811 | case SelectionDAGISel::OPC_CheckChild2Type: | |||
2812 | case SelectionDAGISel::OPC_CheckChild3Type: | |||
2813 | case SelectionDAGISel::OPC_CheckChild4Type: | |||
2814 | case SelectionDAGISel::OPC_CheckChild5Type: | |||
2815 | case SelectionDAGISel::OPC_CheckChild6Type: | |||
2816 | case SelectionDAGISel::OPC_CheckChild7Type: | |||
2817 | Result = !::CheckChildType( | |||
2818 | Table, Index, N, SDISel.TLI, SDISel.CurDAG->getDataLayout(), | |||
2819 | Table[Index - 1] - SelectionDAGISel::OPC_CheckChild0Type); | |||
2820 | return Index; | |||
2821 | case SelectionDAGISel::OPC_CheckCondCode: | |||
2822 | Result = !::CheckCondCode(Table, Index, N); | |||
2823 | return Index; | |||
2824 | case SelectionDAGISel::OPC_CheckValueType: | |||
2825 | Result = !::CheckValueType(Table, Index, N, SDISel.TLI, | |||
2826 | SDISel.CurDAG->getDataLayout()); | |||
2827 | return Index; | |||
2828 | case SelectionDAGISel::OPC_CheckInteger: | |||
2829 | Result = !::CheckInteger(Table, Index, N); | |||
2830 | return Index; | |||
2831 | case SelectionDAGISel::OPC_CheckChild0Integer: | |||
2832 | case SelectionDAGISel::OPC_CheckChild1Integer: | |||
2833 | case SelectionDAGISel::OPC_CheckChild2Integer: | |||
2834 | case SelectionDAGISel::OPC_CheckChild3Integer: | |||
2835 | case SelectionDAGISel::OPC_CheckChild4Integer: | |||
2836 | Result = !::CheckChildInteger(Table, Index, N, | |||
2837 | Table[Index-1] - SelectionDAGISel::OPC_CheckChild0Integer); | |||
2838 | return Index; | |||
2839 | case SelectionDAGISel::OPC_CheckAndImm: | |||
2840 | Result = !::CheckAndImm(Table, Index, N, SDISel); | |||
2841 | return Index; | |||
2842 | case SelectionDAGISel::OPC_CheckOrImm: | |||
2843 | Result = !::CheckOrImm(Table, Index, N, SDISel); | |||
2844 | return Index; | |||
2845 | } | |||
2846 | } | |||
2847 | ||||
2848 | namespace { | |||
2849 | ||||
2850 | struct MatchScope { | |||
2851 | /// FailIndex - If this match fails, this is the index to continue with. | |||
2852 | unsigned FailIndex; | |||
2853 | ||||
2854 | /// NodeStack - The node stack when the scope was formed. | |||
2855 | SmallVector<SDValue, 4> NodeStack; | |||
2856 | ||||
2857 | /// NumRecordedNodes - The number of recorded nodes when the scope was formed. | |||
2858 | unsigned NumRecordedNodes; | |||
2859 | ||||
2860 | /// NumMatchedMemRefs - The number of matched memref entries. | |||
2861 | unsigned NumMatchedMemRefs; | |||
2862 | ||||
2863 | /// InputChain/InputGlue - The current chain/glue | |||
2864 | SDValue InputChain, InputGlue; | |||
2865 | ||||
2866 | /// HasChainNodesMatched - True if the ChainNodesMatched list is non-empty. | |||
2867 | bool HasChainNodesMatched; | |||
2868 | }; | |||
2869 | ||||
2870 | /// \\brief A DAG update listener to keep the matching state | |||
2871 | /// (i.e. RecordedNodes and MatchScope) uptodate if the target is allowed to | |||
2872 | /// change the DAG while matching. X86 addressing mode matcher is an example | |||
2873 | /// for this. | |||
2874 | class MatchStateUpdater : public SelectionDAG::DAGUpdateListener | |||
2875 | { | |||
2876 | SDNode **NodeToMatch; | |||
2877 | SmallVectorImpl<std::pair<SDValue, SDNode *>> &RecordedNodes; | |||
2878 | SmallVectorImpl<MatchScope> &MatchScopes; | |||
2879 | ||||
2880 | public: | |||
2881 | MatchStateUpdater(SelectionDAG &DAG, SDNode **NodeToMatch, | |||
2882 | SmallVectorImpl<std::pair<SDValue, SDNode *>> &RN, | |||
2883 | SmallVectorImpl<MatchScope> &MS) | |||
2884 | : SelectionDAG::DAGUpdateListener(DAG), NodeToMatch(NodeToMatch), | |||
2885 | RecordedNodes(RN), MatchScopes(MS) {} | |||
2886 | ||||
2887 | void NodeDeleted(SDNode *N, SDNode *E) override { | |||
2888 | // Some early-returns here to avoid the search if we deleted the node or | |||
2889 | // if the update comes from MorphNodeTo (MorphNodeTo is the last thing we | |||
2890 | // do, so it's unnecessary to update matching state at that point). | |||
2891 | // Neither of these can occur currently because we only install this | |||
2892 | // update listener during matching a complex patterns. | |||
2893 | if (!E || E->isMachineOpcode()) | |||
2894 | return; | |||
2895 | // Check if NodeToMatch was updated. | |||
2896 | if (N == *NodeToMatch) | |||
2897 | *NodeToMatch = E; | |||
2898 | // Performing linear search here does not matter because we almost never | |||
2899 | // run this code. You'd have to have a CSE during complex pattern | |||
2900 | // matching. | |||
2901 | for (auto &I : RecordedNodes) | |||
2902 | if (I.first.getNode() == N) | |||
2903 | I.first.setNode(E); | |||
2904 | ||||
2905 | for (auto &I : MatchScopes) | |||
2906 | for (auto &J : I.NodeStack) | |||
2907 | if (J.getNode() == N) | |||
2908 | J.setNode(E); | |||
2909 | } | |||
2910 | }; | |||
2911 | ||||
2912 | } // end anonymous namespace | |||
2913 | ||||
2914 | void SelectionDAGISel::SelectCodeCommon(SDNode *NodeToMatch, | |||
2915 | const unsigned char *MatcherTable, | |||
2916 | unsigned TableSize) { | |||
2917 | // FIXME: Should these even be selected? Handle these cases in the caller? | |||
2918 | switch (NodeToMatch->getOpcode()) { | |||
2919 | default: | |||
2920 | break; | |||
2921 | case ISD::EntryToken: // These nodes remain the same. | |||
2922 | case ISD::BasicBlock: | |||
2923 | case ISD::Register: | |||
2924 | case ISD::RegisterMask: | |||
2925 | case ISD::HANDLENODE: | |||
2926 | case ISD::MDNODE_SDNODE: | |||
2927 | case ISD::TargetConstant: | |||
2928 | case ISD::TargetConstantFP: | |||
2929 | case ISD::TargetConstantPool: | |||
2930 | case ISD::TargetFrameIndex: | |||
2931 | case ISD::TargetExternalSymbol: | |||
2932 | case ISD::MCSymbol: | |||
2933 | case ISD::TargetBlockAddress: | |||
2934 | case ISD::TargetJumpTable: | |||
2935 | case ISD::TargetGlobalTLSAddress: | |||
2936 | case ISD::TargetGlobalAddress: | |||
2937 | case ISD::TokenFactor: | |||
2938 | case ISD::CopyFromReg: | |||
2939 | case ISD::CopyToReg: | |||
2940 | case ISD::EH_LABEL: | |||
2941 | case ISD::ANNOTATION_LABEL: | |||
2942 | case ISD::LIFETIME_START: | |||
2943 | case ISD::LIFETIME_END: | |||
2944 | NodeToMatch->setNodeId(-1); // Mark selected. | |||
2945 | return; | |||
2946 | case ISD::AssertSext: | |||
2947 | case ISD::AssertZext: | |||
2948 | CurDAG->ReplaceAllUsesOfValueWith(SDValue(NodeToMatch, 0), | |||
2949 | NodeToMatch->getOperand(0)); | |||
2950 | CurDAG->RemoveDeadNode(NodeToMatch); | |||
2951 | return; | |||
2952 | case ISD::INLINEASM: | |||
2953 | Select_INLINEASM(NodeToMatch); | |||
2954 | return; | |||
2955 | case ISD::READ_REGISTER: | |||
2956 | Select_READ_REGISTER(NodeToMatch); | |||
2957 | return; | |||
2958 | case ISD::WRITE_REGISTER: | |||
2959 | Select_WRITE_REGISTER(NodeToMatch); | |||
2960 | return; | |||
2961 | case ISD::UNDEF: | |||
2962 | Select_UNDEF(NodeToMatch); | |||
2963 | return; | |||
2964 | } | |||
2965 | ||||
2966 | assert(!NodeToMatch->isMachineOpcode() && "Node already selected!")(static_cast <bool> (!NodeToMatch->isMachineOpcode() && "Node already selected!") ? void (0) : __assert_fail ("!NodeToMatch->isMachineOpcode() && \"Node already selected!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 2966, __extension__ __PRETTY_FUNCTION__)); | |||
2967 | ||||
2968 | // Set up the node stack with NodeToMatch as the only node on the stack. | |||
2969 | SmallVector<SDValue, 8> NodeStack; | |||
2970 | SDValue N = SDValue(NodeToMatch, 0); | |||
2971 | NodeStack.push_back(N); | |||
2972 | ||||
2973 | // MatchScopes - Scopes used when matching, if a match failure happens, this | |||
2974 | // indicates where to continue checking. | |||
2975 | SmallVector<MatchScope, 8> MatchScopes; | |||
2976 | ||||
2977 | // RecordedNodes - This is the set of nodes that have been recorded by the | |||
2978 | // state machine. The second value is the parent of the node, or null if the | |||
2979 | // root is recorded. | |||
2980 | SmallVector<std::pair<SDValue, SDNode*>, 8> RecordedNodes; | |||
2981 | ||||
2982 | // MatchedMemRefs - This is the set of MemRef's we've seen in the input | |||
2983 | // pattern. | |||
2984 | SmallVector<MachineMemOperand*, 2> MatchedMemRefs; | |||
2985 | ||||
2986 | // These are the current input chain and glue for use when generating nodes. | |||
2987 | // Various Emit operations change these. For example, emitting a copytoreg | |||
2988 | // uses and updates these. | |||
2989 | SDValue InputChain, InputGlue; | |||
2990 | ||||
2991 | // ChainNodesMatched - If a pattern matches nodes that have input/output | |||
2992 | // chains, the OPC_EmitMergeInputChains operation is emitted which indicates | |||
2993 | // which ones they are. The result is captured into this list so that we can | |||
2994 | // update the chain results when the pattern is complete. | |||
2995 | SmallVector<SDNode*, 3> ChainNodesMatched; | |||
2996 | ||||
2997 | DEBUG(dbgs() << "ISEL: Starting pattern match\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "ISEL: Starting pattern match\n"; } } while (false); | |||
2998 | ||||
2999 | // Determine where to start the interpreter. Normally we start at opcode #0, | |||
3000 | // but if the state machine starts with an OPC_SwitchOpcode, then we | |||
3001 | // accelerate the first lookup (which is guaranteed to be hot) with the | |||
3002 | // OpcodeOffset table. | |||
3003 | unsigned MatcherIndex = 0; | |||
3004 | ||||
3005 | if (!OpcodeOffset.empty()) { | |||
3006 | // Already computed the OpcodeOffset table, just index into it. | |||
3007 | if (N.getOpcode() < OpcodeOffset.size()) | |||
3008 | MatcherIndex = OpcodeOffset[N.getOpcode()]; | |||
3009 | DEBUG(dbgs() << " Initial Opcode index to " << MatcherIndex << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " Initial Opcode index to " << MatcherIndex << "\n"; } } while (false); | |||
3010 | ||||
3011 | } else if (MatcherTable[0] == OPC_SwitchOpcode) { | |||
3012 | // Otherwise, the table isn't computed, but the state machine does start | |||
3013 | // with an OPC_SwitchOpcode instruction. Populate the table now, since this | |||
3014 | // is the first time we're selecting an instruction. | |||
3015 | unsigned Idx = 1; | |||
3016 | while (true) { | |||
3017 | // Get the size of this case. | |||
3018 | unsigned CaseSize = MatcherTable[Idx++]; | |||
3019 | if (CaseSize & 128) | |||
3020 | CaseSize = GetVBR(CaseSize, MatcherTable, Idx); | |||
3021 | if (CaseSize == 0) break; | |||
3022 | ||||
3023 | // Get the opcode, add the index to the table. | |||
3024 | uint16_t Opc = MatcherTable[Idx++]; | |||
3025 | Opc |= (unsigned short)MatcherTable[Idx++] << 8; | |||
3026 | if (Opc >= OpcodeOffset.size()) | |||
3027 | OpcodeOffset.resize((Opc+1)*2); | |||
3028 | OpcodeOffset[Opc] = Idx; | |||
3029 | Idx += CaseSize; | |||
3030 | } | |||
3031 | ||||
3032 | // Okay, do the lookup for the first opcode. | |||
3033 | if (N.getOpcode() < OpcodeOffset.size()) | |||
3034 | MatcherIndex = OpcodeOffset[N.getOpcode()]; | |||
3035 | } | |||
3036 | ||||
3037 | while (true) { | |||
3038 | assert(MatcherIndex < TableSize && "Invalid index")(static_cast <bool> (MatcherIndex < TableSize && "Invalid index") ? void (0) : __assert_fail ("MatcherIndex < TableSize && \"Invalid index\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3038, __extension__ __PRETTY_FUNCTION__)); | |||
3039 | #ifndef NDEBUG | |||
3040 | unsigned CurrentOpcodeIndex = MatcherIndex; | |||
3041 | #endif | |||
3042 | BuiltinOpcodes Opcode = (BuiltinOpcodes)MatcherTable[MatcherIndex++]; | |||
3043 | switch (Opcode) { | |||
3044 | case OPC_Scope: { | |||
3045 | // Okay, the semantics of this operation are that we should push a scope | |||
3046 | // then evaluate the first child. However, pushing a scope only to have | |||
3047 | // the first check fail (which then pops it) is inefficient. If we can | |||
3048 | // determine immediately that the first check (or first several) will | |||
3049 | // immediately fail, don't even bother pushing a scope for them. | |||
3050 | unsigned FailIndex; | |||
3051 | ||||
3052 | while (true) { | |||
3053 | unsigned NumToSkip = MatcherTable[MatcherIndex++]; | |||
3054 | if (NumToSkip & 128) | |||
3055 | NumToSkip = GetVBR(NumToSkip, MatcherTable, MatcherIndex); | |||
3056 | // Found the end of the scope with no match. | |||
3057 | if (NumToSkip == 0) { | |||
3058 | FailIndex = 0; | |||
3059 | break; | |||
3060 | } | |||
3061 | ||||
3062 | FailIndex = MatcherIndex+NumToSkip; | |||
3063 | ||||
3064 | unsigned MatcherIndexOfPredicate = MatcherIndex; | |||
3065 | (void)MatcherIndexOfPredicate; // silence warning. | |||
3066 | ||||
3067 | // If we can't evaluate this predicate without pushing a scope (e.g. if | |||
3068 | // it is a 'MoveParent') or if the predicate succeeds on this node, we | |||
3069 | // push the scope and evaluate the full predicate chain. | |||
3070 | bool Result; | |||
3071 | MatcherIndex = IsPredicateKnownToFail(MatcherTable, MatcherIndex, N, | |||
3072 | Result, *this, RecordedNodes); | |||
3073 | if (!Result) | |||
3074 | break; | |||
3075 | ||||
3076 | DEBUG(dbgs() << " Skipped scope entry (due to false predicate) at "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " Skipped scope entry (due to false predicate) at " << "index " << MatcherIndexOfPredicate << ", continuing at " << FailIndex << "\n"; } } while (false) | |||
3077 | << "index " << MatcherIndexOfPredicatedo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " Skipped scope entry (due to false predicate) at " << "index " << MatcherIndexOfPredicate << ", continuing at " << FailIndex << "\n"; } } while (false) | |||
3078 | << ", continuing at " << FailIndex << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " Skipped scope entry (due to false predicate) at " << "index " << MatcherIndexOfPredicate << ", continuing at " << FailIndex << "\n"; } } while (false); | |||
3079 | ++NumDAGIselRetries; | |||
3080 | ||||
3081 | // Otherwise, we know that this case of the Scope is guaranteed to fail, | |||
3082 | // move to the next case. | |||
3083 | MatcherIndex = FailIndex; | |||
3084 | } | |||
3085 | ||||
3086 | // If the whole scope failed to match, bail. | |||
3087 | if (FailIndex == 0) break; | |||
3088 | ||||
3089 | // Push a MatchScope which indicates where to go if the first child fails | |||
3090 | // to match. | |||
3091 | MatchScope NewEntry; | |||
3092 | NewEntry.FailIndex = FailIndex; | |||
3093 | NewEntry.NodeStack.append(NodeStack.begin(), NodeStack.end()); | |||
3094 | NewEntry.NumRecordedNodes = RecordedNodes.size(); | |||
3095 | NewEntry.NumMatchedMemRefs = MatchedMemRefs.size(); | |||
3096 | NewEntry.InputChain = InputChain; | |||
3097 | NewEntry.InputGlue = InputGlue; | |||
3098 | NewEntry.HasChainNodesMatched = !ChainNodesMatched.empty(); | |||
3099 | MatchScopes.push_back(NewEntry); | |||
3100 | continue; | |||
3101 | } | |||
3102 | case OPC_RecordNode: { | |||
3103 | // Remember this node, it may end up being an operand in the pattern. | |||
3104 | SDNode *Parent = nullptr; | |||
3105 | if (NodeStack.size() > 1) | |||
3106 | Parent = NodeStack[NodeStack.size()-2].getNode(); | |||
3107 | RecordedNodes.push_back(std::make_pair(N, Parent)); | |||
3108 | continue; | |||
3109 | } | |||
3110 | ||||
3111 | case OPC_RecordChild0: case OPC_RecordChild1: | |||
3112 | case OPC_RecordChild2: case OPC_RecordChild3: | |||
3113 | case OPC_RecordChild4: case OPC_RecordChild5: | |||
3114 | case OPC_RecordChild6: case OPC_RecordChild7: { | |||
3115 | unsigned ChildNo = Opcode-OPC_RecordChild0; | |||
3116 | if (ChildNo >= N.getNumOperands()) | |||
3117 | break; // Match fails if out of range child #. | |||
3118 | ||||
3119 | RecordedNodes.push_back(std::make_pair(N->getOperand(ChildNo), | |||
3120 | N.getNode())); | |||
3121 | continue; | |||
3122 | } | |||
3123 | case OPC_RecordMemRef: | |||
3124 | if (auto *MN = dyn_cast<MemSDNode>(N)) | |||
3125 | MatchedMemRefs.push_back(MN->getMemOperand()); | |||
3126 | else { | |||
3127 | DEBUG(do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Expected MemSDNode "; N->dump (CurDAG); dbgs() << '\n'; } } while (false) | |||
3128 | dbgs() << "Expected MemSDNode ";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Expected MemSDNode "; N->dump (CurDAG); dbgs() << '\n'; } } while (false) | |||
3129 | N->dump(CurDAG);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Expected MemSDNode "; N->dump (CurDAG); dbgs() << '\n'; } } while (false) | |||
3130 | dbgs() << '\n'do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Expected MemSDNode "; N->dump (CurDAG); dbgs() << '\n'; } } while (false) | |||
3131 | )do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << "Expected MemSDNode "; N->dump (CurDAG); dbgs() << '\n'; } } while (false); | |||
3132 | } | |||
3133 | ||||
3134 | continue; | |||
3135 | ||||
3136 | case OPC_CaptureGlueInput: | |||
3137 | // If the current node has an input glue, capture it in InputGlue. | |||
3138 | if (N->getNumOperands() != 0 && | |||
3139 | N->getOperand(N->getNumOperands()-1).getValueType() == MVT::Glue) | |||
3140 | InputGlue = N->getOperand(N->getNumOperands()-1); | |||
3141 | continue; | |||
3142 | ||||
3143 | case OPC_MoveChild: { | |||
3144 | unsigned ChildNo = MatcherTable[MatcherIndex++]; | |||
3145 | if (ChildNo >= N.getNumOperands()) | |||
3146 | break; // Match fails if out of range child #. | |||
3147 | N = N.getOperand(ChildNo); | |||
3148 | NodeStack.push_back(N); | |||
3149 | continue; | |||
3150 | } | |||
3151 | ||||
3152 | case OPC_MoveChild0: case OPC_MoveChild1: | |||
3153 | case OPC_MoveChild2: case OPC_MoveChild3: | |||
3154 | case OPC_MoveChild4: case OPC_MoveChild5: | |||
3155 | case OPC_MoveChild6: case OPC_MoveChild7: { | |||
3156 | unsigned ChildNo = Opcode-OPC_MoveChild0; | |||
3157 | if (ChildNo >= N.getNumOperands()) | |||
3158 | break; // Match fails if out of range child #. | |||
3159 | N = N.getOperand(ChildNo); | |||
3160 | NodeStack.push_back(N); | |||
3161 | continue; | |||
3162 | } | |||
3163 | ||||
3164 | case OPC_MoveParent: | |||
3165 | // Pop the current node off the NodeStack. | |||
3166 | NodeStack.pop_back(); | |||
3167 | assert(!NodeStack.empty() && "Node stack imbalance!")(static_cast <bool> (!NodeStack.empty() && "Node stack imbalance!" ) ? void (0) : __assert_fail ("!NodeStack.empty() && \"Node stack imbalance!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3167, __extension__ __PRETTY_FUNCTION__)); | |||
3168 | N = NodeStack.back(); | |||
3169 | continue; | |||
3170 | ||||
3171 | case OPC_CheckSame: | |||
3172 | if (!::CheckSame(MatcherTable, MatcherIndex, N, RecordedNodes)) break; | |||
3173 | continue; | |||
3174 | ||||
3175 | case OPC_CheckChild0Same: case OPC_CheckChild1Same: | |||
3176 | case OPC_CheckChild2Same: case OPC_CheckChild3Same: | |||
3177 | if (!::CheckChildSame(MatcherTable, MatcherIndex, N, RecordedNodes, | |||
3178 | Opcode-OPC_CheckChild0Same)) | |||
3179 | break; | |||
3180 | continue; | |||
3181 | ||||
3182 | case OPC_CheckPatternPredicate: | |||
3183 | if (!::CheckPatternPredicate(MatcherTable, MatcherIndex, *this)) break; | |||
3184 | continue; | |||
3185 | case OPC_CheckPredicate: | |||
3186 | if (!::CheckNodePredicate(MatcherTable, MatcherIndex, *this, | |||
3187 | N.getNode())) | |||
3188 | break; | |||
3189 | continue; | |||
3190 | case OPC_CheckComplexPat: { | |||
3191 | unsigned CPNum = MatcherTable[MatcherIndex++]; | |||
3192 | unsigned RecNo = MatcherTable[MatcherIndex++]; | |||
3193 | assert(RecNo < RecordedNodes.size() && "Invalid CheckComplexPat")(static_cast <bool> (RecNo < RecordedNodes.size() && "Invalid CheckComplexPat") ? void (0) : __assert_fail ("RecNo < RecordedNodes.size() && \"Invalid CheckComplexPat\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3193, __extension__ __PRETTY_FUNCTION__)); | |||
3194 | ||||
3195 | // If target can modify DAG during matching, keep the matching state | |||
3196 | // consistent. | |||
3197 | std::unique_ptr<MatchStateUpdater> MSU; | |||
3198 | if (ComplexPatternFuncMutatesDAG()) | |||
3199 | MSU.reset(new MatchStateUpdater(*CurDAG, &NodeToMatch, RecordedNodes, | |||
3200 | MatchScopes)); | |||
3201 | ||||
3202 | if (!CheckComplexPattern(NodeToMatch, RecordedNodes[RecNo].second, | |||
3203 | RecordedNodes[RecNo].first, CPNum, | |||
3204 | RecordedNodes)) | |||
3205 | break; | |||
3206 | continue; | |||
3207 | } | |||
3208 | case OPC_CheckOpcode: | |||
3209 | if (!::CheckOpcode(MatcherTable, MatcherIndex, N.getNode())) break; | |||
3210 | continue; | |||
3211 | ||||
3212 | case OPC_CheckType: | |||
3213 | if (!::CheckType(MatcherTable, MatcherIndex, N, TLI, | |||
3214 | CurDAG->getDataLayout())) | |||
3215 | break; | |||
3216 | continue; | |||
3217 | ||||
3218 | case OPC_CheckTypeRes: { | |||
3219 | unsigned Res = MatcherTable[MatcherIndex++]; | |||
3220 | if (!::CheckType(MatcherTable, MatcherIndex, N.getValue(Res), TLI, | |||
3221 | CurDAG->getDataLayout())) | |||
3222 | break; | |||
3223 | continue; | |||
3224 | } | |||
3225 | ||||
3226 | case OPC_SwitchOpcode: { | |||
3227 | unsigned CurNodeOpcode = N.getOpcode(); | |||
3228 | unsigned SwitchStart = MatcherIndex-1; (void)SwitchStart; | |||
3229 | unsigned CaseSize; | |||
3230 | while (true) { | |||
3231 | // Get the size of this case. | |||
3232 | CaseSize = MatcherTable[MatcherIndex++]; | |||
3233 | if (CaseSize & 128) | |||
3234 | CaseSize = GetVBR(CaseSize, MatcherTable, MatcherIndex); | |||
3235 | if (CaseSize == 0) break; | |||
3236 | ||||
3237 | uint16_t Opc = MatcherTable[MatcherIndex++]; | |||
3238 | Opc |= (unsigned short)MatcherTable[MatcherIndex++] << 8; | |||
3239 | ||||
3240 | // If the opcode matches, then we will execute this case. | |||
3241 | if (CurNodeOpcode == Opc) | |||
3242 | break; | |||
3243 | ||||
3244 | // Otherwise, skip over this case. | |||
3245 | MatcherIndex += CaseSize; | |||
3246 | } | |||
3247 | ||||
3248 | // If no cases matched, bail out. | |||
3249 | if (CaseSize == 0) break; | |||
3250 | ||||
3251 | // Otherwise, execute the case we found. | |||
3252 | DEBUG(dbgs() << " OpcodeSwitch from " << SwitchStartdo { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " OpcodeSwitch from " << SwitchStart << " to " << MatcherIndex << "\n"; } } while (false) | |||
3253 | << " to " << MatcherIndex << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " OpcodeSwitch from " << SwitchStart << " to " << MatcherIndex << "\n"; } } while (false); | |||
3254 | continue; | |||
3255 | } | |||
3256 | ||||
3257 | case OPC_SwitchType: { | |||
3258 | MVT CurNodeVT = N.getSimpleValueType(); | |||
3259 | unsigned SwitchStart = MatcherIndex-1; (void)SwitchStart; | |||
3260 | unsigned CaseSize; | |||
3261 | while (true) { | |||
3262 | // Get the size of this case. | |||
3263 | CaseSize = MatcherTable[MatcherIndex++]; | |||
3264 | if (CaseSize & 128) | |||
3265 | CaseSize = GetVBR(CaseSize, MatcherTable, MatcherIndex); | |||
3266 | if (CaseSize == 0) break; | |||
3267 | ||||
3268 | MVT CaseVT = (MVT::SimpleValueType)MatcherTable[MatcherIndex++]; | |||
3269 | if (CaseVT == MVT::iPTR) | |||
3270 | CaseVT = TLI->getPointerTy(CurDAG->getDataLayout()); | |||
3271 | ||||
3272 | // If the VT matches, then we will execute this case. | |||
3273 | if (CurNodeVT == CaseVT) | |||
3274 | break; | |||
3275 | ||||
3276 | // Otherwise, skip over this case. | |||
3277 | MatcherIndex += CaseSize; | |||
3278 | } | |||
3279 | ||||
3280 | // If no cases matched, bail out. | |||
3281 | if (CaseSize == 0) break; | |||
3282 | ||||
3283 | // Otherwise, execute the case we found. | |||
3284 | DEBUG(dbgs() << " TypeSwitch[" << EVT(CurNodeVT).getEVTString()do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " TypeSwitch[" << EVT(CurNodeVT ).getEVTString() << "] from " << SwitchStart << " to " << MatcherIndex<<'\n'; } } while (false) | |||
3285 | << "] from " << SwitchStart << " to " << MatcherIndex<<'\n')do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " TypeSwitch[" << EVT(CurNodeVT ).getEVTString() << "] from " << SwitchStart << " to " << MatcherIndex<<'\n'; } } while (false); | |||
3286 | continue; | |||
3287 | } | |||
3288 | case OPC_CheckChild0Type: case OPC_CheckChild1Type: | |||
3289 | case OPC_CheckChild2Type: case OPC_CheckChild3Type: | |||
3290 | case OPC_CheckChild4Type: case OPC_CheckChild5Type: | |||
3291 | case OPC_CheckChild6Type: case OPC_CheckChild7Type: | |||
3292 | if (!::CheckChildType(MatcherTable, MatcherIndex, N, TLI, | |||
3293 | CurDAG->getDataLayout(), | |||
3294 | Opcode - OPC_CheckChild0Type)) | |||
3295 | break; | |||
3296 | continue; | |||
3297 | case OPC_CheckCondCode: | |||
3298 | if (!::CheckCondCode(MatcherTable, MatcherIndex, N)) break; | |||
3299 | continue; | |||
3300 | case OPC_CheckValueType: | |||
3301 | if (!::CheckValueType(MatcherTable, MatcherIndex, N, TLI, | |||
3302 | CurDAG->getDataLayout())) | |||
3303 | break; | |||
3304 | continue; | |||
3305 | case OPC_CheckInteger: | |||
3306 | if (!::CheckInteger(MatcherTable, MatcherIndex, N)) break; | |||
3307 | continue; | |||
3308 | case OPC_CheckChild0Integer: case OPC_CheckChild1Integer: | |||
3309 | case OPC_CheckChild2Integer: case OPC_CheckChild3Integer: | |||
3310 | case OPC_CheckChild4Integer: | |||
3311 | if (!::CheckChildInteger(MatcherTable, MatcherIndex, N, | |||
3312 | Opcode-OPC_CheckChild0Integer)) break; | |||
3313 | continue; | |||
3314 | case OPC_CheckAndImm: | |||
3315 | if (!::CheckAndImm(MatcherTable, MatcherIndex, N, *this)) break; | |||
3316 | continue; | |||
3317 | case OPC_CheckOrImm: | |||
3318 | if (!::CheckOrImm(MatcherTable, MatcherIndex, N, *this)) break; | |||
3319 | continue; | |||
3320 | ||||
3321 | case OPC_CheckFoldableChainNode: { | |||
3322 | assert(NodeStack.size() != 1 && "No parent node")(static_cast <bool> (NodeStack.size() != 1 && "No parent node" ) ? void (0) : __assert_fail ("NodeStack.size() != 1 && \"No parent node\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3322, __extension__ __PRETTY_FUNCTION__)); | |||
3323 | // Verify that all intermediate nodes between the root and this one have | |||
3324 | // a single use. | |||
3325 | bool HasMultipleUses = false; | |||
3326 | for (unsigned i = 1, e = NodeStack.size()-1; i != e; ++i) | |||
3327 | if (!NodeStack[i].getNode()->hasOneUse()) { | |||
3328 | HasMultipleUses = true; | |||
3329 | break; | |||
3330 | } | |||
3331 | if (HasMultipleUses) break; | |||
3332 | ||||
3333 | // Check to see that the target thinks this is profitable to fold and that | |||
3334 | // we can fold it without inducing cycles in the graph. | |||
3335 | if (!IsProfitableToFold(N, NodeStack[NodeStack.size()-2].getNode(), | |||
3336 | NodeToMatch) || | |||
3337 | !IsLegalToFold(N, NodeStack[NodeStack.size()-2].getNode(), | |||
3338 | NodeToMatch, OptLevel, | |||
3339 | true/*We validate our own chains*/)) | |||
3340 | break; | |||
3341 | ||||
3342 | continue; | |||
3343 | } | |||
3344 | case OPC_EmitInteger: { | |||
3345 | MVT::SimpleValueType VT = | |||
3346 | (MVT::SimpleValueType)MatcherTable[MatcherIndex++]; | |||
3347 | int64_t Val = MatcherTable[MatcherIndex++]; | |||
3348 | if (Val & 128) | |||
3349 | Val = GetVBR(Val, MatcherTable, MatcherIndex); | |||
3350 | RecordedNodes.push_back(std::pair<SDValue, SDNode*>( | |||
3351 | CurDAG->getTargetConstant(Val, SDLoc(NodeToMatch), | |||
3352 | VT), nullptr)); | |||
3353 | continue; | |||
3354 | } | |||
3355 | case OPC_EmitRegister: { | |||
3356 | MVT::SimpleValueType VT = | |||
3357 | (MVT::SimpleValueType)MatcherTable[MatcherIndex++]; | |||
3358 | unsigned RegNo = MatcherTable[MatcherIndex++]; | |||
3359 | RecordedNodes.push_back(std::pair<SDValue, SDNode*>( | |||
3360 | CurDAG->getRegister(RegNo, VT), nullptr)); | |||
3361 | continue; | |||
3362 | } | |||
3363 | case OPC_EmitRegister2: { | |||
3364 | // For targets w/ more than 256 register names, the register enum | |||
3365 | // values are stored in two bytes in the matcher table (just like | |||
3366 | // opcodes). | |||
3367 | MVT::SimpleValueType VT = | |||
3368 | (MVT::SimpleValueType)MatcherTable[MatcherIndex++]; | |||
3369 | unsigned RegNo = MatcherTable[MatcherIndex++]; | |||
3370 | RegNo |= MatcherTable[MatcherIndex++] << 8; | |||
3371 | RecordedNodes.push_back(std::pair<SDValue, SDNode*>( | |||
3372 | CurDAG->getRegister(RegNo, VT), nullptr)); | |||
3373 | continue; | |||
3374 | } | |||
3375 | ||||
3376 | case OPC_EmitConvertToTarget: { | |||
3377 | // Convert from IMM/FPIMM to target version. | |||
3378 | unsigned RecNo = MatcherTable[MatcherIndex++]; | |||
3379 | assert(RecNo < RecordedNodes.size() && "Invalid EmitConvertToTarget")(static_cast <bool> (RecNo < RecordedNodes.size() && "Invalid EmitConvertToTarget") ? void (0) : __assert_fail ("RecNo < RecordedNodes.size() && \"Invalid EmitConvertToTarget\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3379, __extension__ __PRETTY_FUNCTION__)); | |||
3380 | SDValue Imm = RecordedNodes[RecNo].first; | |||
3381 | ||||
3382 | if (Imm->getOpcode() == ISD::Constant) { | |||
3383 | const ConstantInt *Val=cast<ConstantSDNode>(Imm)->getConstantIntValue(); | |||
3384 | Imm = CurDAG->getTargetConstant(*Val, SDLoc(NodeToMatch), | |||
3385 | Imm.getValueType()); | |||
3386 | } else if (Imm->getOpcode() == ISD::ConstantFP) { | |||
3387 | const ConstantFP *Val=cast<ConstantFPSDNode>(Imm)->getConstantFPValue(); | |||
3388 | Imm = CurDAG->getTargetConstantFP(*Val, SDLoc(NodeToMatch), | |||
3389 | Imm.getValueType()); | |||
3390 | } | |||
3391 | ||||
3392 | RecordedNodes.push_back(std::make_pair(Imm, RecordedNodes[RecNo].second)); | |||
3393 | continue; | |||
3394 | } | |||
3395 | ||||
3396 | case OPC_EmitMergeInputChains1_0: // OPC_EmitMergeInputChains, 1, 0 | |||
3397 | case OPC_EmitMergeInputChains1_1: // OPC_EmitMergeInputChains, 1, 1 | |||
3398 | case OPC_EmitMergeInputChains1_2: { // OPC_EmitMergeInputChains, 1, 2 | |||
3399 | // These are space-optimized forms of OPC_EmitMergeInputChains. | |||
3400 | assert(!InputChain.getNode() &&(static_cast <bool> (!InputChain.getNode() && "EmitMergeInputChains should be the first chain producing node" ) ? void (0) : __assert_fail ("!InputChain.getNode() && \"EmitMergeInputChains should be the first chain producing node\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3401, __extension__ __PRETTY_FUNCTION__)) | |||
3401 | "EmitMergeInputChains should be the first chain producing node")(static_cast <bool> (!InputChain.getNode() && "EmitMergeInputChains should be the first chain producing node" ) ? void (0) : __assert_fail ("!InputChain.getNode() && \"EmitMergeInputChains should be the first chain producing node\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3401, __extension__ __PRETTY_FUNCTION__)); | |||
3402 | assert(ChainNodesMatched.empty() &&(static_cast <bool> (ChainNodesMatched.empty() && "Should only have one EmitMergeInputChains per match") ? void (0) : __assert_fail ("ChainNodesMatched.empty() && \"Should only have one EmitMergeInputChains per match\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3403, __extension__ __PRETTY_FUNCTION__)) | |||
3403 | "Should only have one EmitMergeInputChains per match")(static_cast <bool> (ChainNodesMatched.empty() && "Should only have one EmitMergeInputChains per match") ? void (0) : __assert_fail ("ChainNodesMatched.empty() && \"Should only have one EmitMergeInputChains per match\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3403, __extension__ __PRETTY_FUNCTION__)); | |||
3404 | ||||
3405 | // Read all of the chained nodes. | |||
3406 | unsigned RecNo = Opcode - OPC_EmitMergeInputChains1_0; | |||
3407 | assert(RecNo < RecordedNodes.size() && "Invalid EmitMergeInputChains")(static_cast <bool> (RecNo < RecordedNodes.size() && "Invalid EmitMergeInputChains") ? void (0) : __assert_fail ( "RecNo < RecordedNodes.size() && \"Invalid EmitMergeInputChains\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3407, __extension__ __PRETTY_FUNCTION__)); | |||
3408 | ChainNodesMatched.push_back(RecordedNodes[RecNo].first.getNode()); | |||
3409 | ||||
3410 | // FIXME: What if other value results of the node have uses not matched | |||
3411 | // by this pattern? | |||
3412 | if (ChainNodesMatched.back() != NodeToMatch && | |||
3413 | !RecordedNodes[RecNo].first.hasOneUse()) { | |||
3414 | ChainNodesMatched.clear(); | |||
3415 | break; | |||
3416 | } | |||
3417 | ||||
3418 | // Merge the input chains if they are not intra-pattern references. | |||
3419 | InputChain = HandleMergeInputChains(ChainNodesMatched, CurDAG); | |||
3420 | ||||
3421 | if (!InputChain.getNode()) | |||
3422 | break; // Failed to merge. | |||
3423 | continue; | |||
3424 | } | |||
3425 | ||||
3426 | case OPC_EmitMergeInputChains: { | |||
3427 | assert(!InputChain.getNode() &&(static_cast <bool> (!InputChain.getNode() && "EmitMergeInputChains should be the first chain producing node" ) ? void (0) : __assert_fail ("!InputChain.getNode() && \"EmitMergeInputChains should be the first chain producing node\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3428, __extension__ __PRETTY_FUNCTION__)) | |||
3428 | "EmitMergeInputChains should be the first chain producing node")(static_cast <bool> (!InputChain.getNode() && "EmitMergeInputChains should be the first chain producing node" ) ? void (0) : __assert_fail ("!InputChain.getNode() && \"EmitMergeInputChains should be the first chain producing node\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3428, __extension__ __PRETTY_FUNCTION__)); | |||
3429 | // This node gets a list of nodes we matched in the input that have | |||
3430 | // chains. We want to token factor all of the input chains to these nodes | |||
3431 | // together. However, if any of the input chains is actually one of the | |||
3432 | // nodes matched in this pattern, then we have an intra-match reference. | |||
3433 | // Ignore these because the newly token factored chain should not refer to | |||
3434 | // the old nodes. | |||
3435 | unsigned NumChains = MatcherTable[MatcherIndex++]; | |||
3436 | assert(NumChains != 0 && "Can't TF zero chains")(static_cast <bool> (NumChains != 0 && "Can't TF zero chains" ) ? void (0) : __assert_fail ("NumChains != 0 && \"Can't TF zero chains\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3436, __extension__ __PRETTY_FUNCTION__)); | |||
3437 | ||||
3438 | assert(ChainNodesMatched.empty() &&(static_cast <bool> (ChainNodesMatched.empty() && "Should only have one EmitMergeInputChains per match") ? void (0) : __assert_fail ("ChainNodesMatched.empty() && \"Should only have one EmitMergeInputChains per match\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3439, __extension__ __PRETTY_FUNCTION__)) | |||
3439 | "Should only have one EmitMergeInputChains per match")(static_cast <bool> (ChainNodesMatched.empty() && "Should only have one EmitMergeInputChains per match") ? void (0) : __assert_fail ("ChainNodesMatched.empty() && \"Should only have one EmitMergeInputChains per match\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3439, __extension__ __PRETTY_FUNCTION__)); | |||
3440 | ||||
3441 | // Read all of the chained nodes. | |||
3442 | for (unsigned i = 0; i != NumChains; ++i) { | |||
3443 | unsigned RecNo = MatcherTable[MatcherIndex++]; | |||
3444 | assert(RecNo < RecordedNodes.size() && "Invalid EmitMergeInputChains")(static_cast <bool> (RecNo < RecordedNodes.size() && "Invalid EmitMergeInputChains") ? void (0) : __assert_fail ( "RecNo < RecordedNodes.size() && \"Invalid EmitMergeInputChains\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3444, __extension__ __PRETTY_FUNCTION__)); | |||
3445 | ChainNodesMatched.push_back(RecordedNodes[RecNo].first.getNode()); | |||
3446 | ||||
3447 | // FIXME: What if other value results of the node have uses not matched | |||
3448 | // by this pattern? | |||
3449 | if (ChainNodesMatched.back() != NodeToMatch && | |||
3450 | !RecordedNodes[RecNo].first.hasOneUse()) { | |||
3451 | ChainNodesMatched.clear(); | |||
3452 | break; | |||
3453 | } | |||
3454 | } | |||
3455 | ||||
3456 | // If the inner loop broke out, the match fails. | |||
3457 | if (ChainNodesMatched.empty()) | |||
3458 | break; | |||
3459 | ||||
3460 | // Merge the input chains if they are not intra-pattern references. | |||
3461 | InputChain = HandleMergeInputChains(ChainNodesMatched, CurDAG); | |||
3462 | ||||
3463 | if (!InputChain.getNode()) | |||
3464 | break; // Failed to merge. | |||
3465 | ||||
3466 | continue; | |||
3467 | } | |||
3468 | ||||
3469 | case OPC_EmitCopyToReg: { | |||
3470 | unsigned RecNo = MatcherTable[MatcherIndex++]; | |||
3471 | assert(RecNo < RecordedNodes.size() && "Invalid EmitCopyToReg")(static_cast <bool> (RecNo < RecordedNodes.size() && "Invalid EmitCopyToReg") ? void (0) : __assert_fail ("RecNo < RecordedNodes.size() && \"Invalid EmitCopyToReg\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3471, __extension__ __PRETTY_FUNCTION__)); | |||
3472 | unsigned DestPhysReg = MatcherTable[MatcherIndex++]; | |||
3473 | ||||
3474 | if (!InputChain.getNode()) | |||
3475 | InputChain = CurDAG->getEntryNode(); | |||
3476 | ||||
3477 | InputChain = CurDAG->getCopyToReg(InputChain, SDLoc(NodeToMatch), | |||
3478 | DestPhysReg, RecordedNodes[RecNo].first, | |||
3479 | InputGlue); | |||
3480 | ||||
3481 | InputGlue = InputChain.getValue(1); | |||
3482 | continue; | |||
3483 | } | |||
3484 | ||||
3485 | case OPC_EmitNodeXForm: { | |||
3486 | unsigned XFormNo = MatcherTable[MatcherIndex++]; | |||
3487 | unsigned RecNo = MatcherTable[MatcherIndex++]; | |||
3488 | assert(RecNo < RecordedNodes.size() && "Invalid EmitNodeXForm")(static_cast <bool> (RecNo < RecordedNodes.size() && "Invalid EmitNodeXForm") ? void (0) : __assert_fail ("RecNo < RecordedNodes.size() && \"Invalid EmitNodeXForm\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3488, __extension__ __PRETTY_FUNCTION__)); | |||
3489 | SDValue Res = RunSDNodeXForm(RecordedNodes[RecNo].first, XFormNo); | |||
3490 | RecordedNodes.push_back(std::pair<SDValue,SDNode*>(Res, nullptr)); | |||
3491 | continue; | |||
3492 | } | |||
3493 | case OPC_Coverage: { | |||
3494 | // This is emitted right before MorphNode/EmitNode. | |||
3495 | // So it should be safe to assume that this node has been selected | |||
3496 | unsigned index = MatcherTable[MatcherIndex++]; | |||
3497 | index |= (MatcherTable[MatcherIndex++] << 8); | |||
3498 | dbgs() << "COVERED: " << getPatternForIndex(index) << "\n"; | |||
3499 | dbgs() << "INCLUDED: " << getIncludePathForIndex(index) << "\n"; | |||
3500 | continue; | |||
3501 | } | |||
3502 | ||||
3503 | case OPC_EmitNode: case OPC_MorphNodeTo: | |||
3504 | case OPC_EmitNode0: case OPC_EmitNode1: case OPC_EmitNode2: | |||
3505 | case OPC_MorphNodeTo0: case OPC_MorphNodeTo1: case OPC_MorphNodeTo2: { | |||
3506 | uint16_t TargetOpc = MatcherTable[MatcherIndex++]; | |||
3507 | TargetOpc |= (unsigned short)MatcherTable[MatcherIndex++] << 8; | |||
3508 | unsigned EmitNodeInfo = MatcherTable[MatcherIndex++]; | |||
3509 | // Get the result VT list. | |||
3510 | unsigned NumVTs; | |||
3511 | // If this is one of the compressed forms, get the number of VTs based | |||
3512 | // on the Opcode. Otherwise read the next byte from the table. | |||
3513 | if (Opcode >= OPC_MorphNodeTo0 && Opcode <= OPC_MorphNodeTo2) | |||
3514 | NumVTs = Opcode - OPC_MorphNodeTo0; | |||
3515 | else if (Opcode >= OPC_EmitNode0 && Opcode <= OPC_EmitNode2) | |||
3516 | NumVTs = Opcode - OPC_EmitNode0; | |||
3517 | else | |||
3518 | NumVTs = MatcherTable[MatcherIndex++]; | |||
3519 | SmallVector<EVT, 4> VTs; | |||
3520 | for (unsigned i = 0; i != NumVTs; ++i) { | |||
3521 | MVT::SimpleValueType VT = | |||
3522 | (MVT::SimpleValueType)MatcherTable[MatcherIndex++]; | |||
3523 | if (VT == MVT::iPTR) | |||
3524 | VT = TLI->getPointerTy(CurDAG->getDataLayout()).SimpleTy; | |||
3525 | VTs.push_back(VT); | |||
3526 | } | |||
3527 | ||||
3528 | if (EmitNodeInfo & OPFL_Chain) | |||
3529 | VTs.push_back(MVT::Other); | |||
3530 | if (EmitNodeInfo & OPFL_GlueOutput) | |||
3531 | VTs.push_back(MVT::Glue); | |||
3532 | ||||
3533 | // This is hot code, so optimize the two most common cases of 1 and 2 | |||
3534 | // results. | |||
3535 | SDVTList VTList; | |||
3536 | if (VTs.size() == 1) | |||
3537 | VTList = CurDAG->getVTList(VTs[0]); | |||
3538 | else if (VTs.size() == 2) | |||
3539 | VTList = CurDAG->getVTList(VTs[0], VTs[1]); | |||
3540 | else | |||
3541 | VTList = CurDAG->getVTList(VTs); | |||
3542 | ||||
3543 | // Get the operand list. | |||
3544 | unsigned NumOps = MatcherTable[MatcherIndex++]; | |||
3545 | SmallVector<SDValue, 8> Ops; | |||
3546 | for (unsigned i = 0; i != NumOps; ++i) { | |||
3547 | unsigned RecNo = MatcherTable[MatcherIndex++]; | |||
3548 | if (RecNo & 128) | |||
3549 | RecNo = GetVBR(RecNo, MatcherTable, MatcherIndex); | |||
3550 | ||||
3551 | assert(RecNo < RecordedNodes.size() && "Invalid EmitNode")(static_cast <bool> (RecNo < RecordedNodes.size() && "Invalid EmitNode") ? void (0) : __assert_fail ("RecNo < RecordedNodes.size() && \"Invalid EmitNode\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3551, __extension__ __PRETTY_FUNCTION__)); | |||
3552 | Ops.push_back(RecordedNodes[RecNo].first); | |||
3553 | } | |||
3554 | ||||
3555 | // If there are variadic operands to add, handle them now. | |||
3556 | if (EmitNodeInfo & OPFL_VariadicInfo) { | |||
3557 | // Determine the start index to copy from. | |||
3558 | unsigned FirstOpToCopy = getNumFixedFromVariadicInfo(EmitNodeInfo); | |||
3559 | FirstOpToCopy += (EmitNodeInfo & OPFL_Chain) ? 1 : 0; | |||
3560 | assert(NodeToMatch->getNumOperands() >= FirstOpToCopy &&(static_cast <bool> (NodeToMatch->getNumOperands() >= FirstOpToCopy && "Invalid variadic node") ? void (0) : __assert_fail ("NodeToMatch->getNumOperands() >= FirstOpToCopy && \"Invalid variadic node\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3561, __extension__ __PRETTY_FUNCTION__)) | |||
3561 | "Invalid variadic node")(static_cast <bool> (NodeToMatch->getNumOperands() >= FirstOpToCopy && "Invalid variadic node") ? void (0) : __assert_fail ("NodeToMatch->getNumOperands() >= FirstOpToCopy && \"Invalid variadic node\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3561, __extension__ __PRETTY_FUNCTION__)); | |||
3562 | // Copy all of the variadic operands, not including a potential glue | |||
3563 | // input. | |||
3564 | for (unsigned i = FirstOpToCopy, e = NodeToMatch->getNumOperands(); | |||
3565 | i != e; ++i) { | |||
3566 | SDValue V = NodeToMatch->getOperand(i); | |||
3567 | if (V.getValueType() == MVT::Glue) break; | |||
3568 | Ops.push_back(V); | |||
3569 | } | |||
3570 | } | |||
3571 | ||||
3572 | // If this has chain/glue inputs, add them. | |||
3573 | if (EmitNodeInfo & OPFL_Chain) | |||
3574 | Ops.push_back(InputChain); | |||
3575 | if ((EmitNodeInfo & OPFL_GlueInput) && InputGlue.getNode() != nullptr) | |||
3576 | Ops.push_back(InputGlue); | |||
3577 | ||||
3578 | // Create the node. | |||
3579 | MachineSDNode *Res = nullptr; | |||
3580 | bool IsMorphNodeTo = Opcode == OPC_MorphNodeTo || | |||
3581 | (Opcode >= OPC_MorphNodeTo0 && Opcode <= OPC_MorphNodeTo2); | |||
3582 | if (!IsMorphNodeTo) { | |||
3583 | // If this is a normal EmitNode command, just create the new node and | |||
3584 | // add the results to the RecordedNodes list. | |||
3585 | Res = CurDAG->getMachineNode(TargetOpc, SDLoc(NodeToMatch), | |||
3586 | VTList, Ops); | |||
3587 | ||||
3588 | // Add all the non-glue/non-chain results to the RecordedNodes list. | |||
3589 | for (unsigned i = 0, e = VTs.size(); i != e; ++i) { | |||
3590 | if (VTs[i] == MVT::Other || VTs[i] == MVT::Glue) break; | |||
3591 | RecordedNodes.push_back(std::pair<SDValue,SDNode*>(SDValue(Res, i), | |||
3592 | nullptr)); | |||
3593 | } | |||
3594 | } else { | |||
3595 | assert(NodeToMatch->getOpcode() != ISD::DELETED_NODE &&(static_cast <bool> (NodeToMatch->getOpcode() != ISD ::DELETED_NODE && "NodeToMatch was removed partway through selection" ) ? void (0) : __assert_fail ("NodeToMatch->getOpcode() != ISD::DELETED_NODE && \"NodeToMatch was removed partway through selection\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3596, __extension__ __PRETTY_FUNCTION__)) | |||
3596 | "NodeToMatch was removed partway through selection")(static_cast <bool> (NodeToMatch->getOpcode() != ISD ::DELETED_NODE && "NodeToMatch was removed partway through selection" ) ? void (0) : __assert_fail ("NodeToMatch->getOpcode() != ISD::DELETED_NODE && \"NodeToMatch was removed partway through selection\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3596, __extension__ __PRETTY_FUNCTION__)); | |||
3597 | SelectionDAG::DAGNodeDeletedListener NDL(*CurDAG, [&](SDNode *N, | |||
3598 | SDNode *E) { | |||
3599 | CurDAG->salvageDebugInfo(*N); | |||
3600 | auto &Chain = ChainNodesMatched; | |||
3601 | assert((!E || !is_contained(Chain, N)) &&(static_cast <bool> ((!E || !is_contained(Chain, N)) && "Chain node replaced during MorphNode") ? void (0) : __assert_fail ("(!E || !is_contained(Chain, N)) && \"Chain node replaced during MorphNode\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3602, __extension__ __PRETTY_FUNCTION__)) | |||
3602 | "Chain node replaced during MorphNode")(static_cast <bool> ((!E || !is_contained(Chain, N)) && "Chain node replaced during MorphNode") ? void (0) : __assert_fail ("(!E || !is_contained(Chain, N)) && \"Chain node replaced during MorphNode\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3602, __extension__ __PRETTY_FUNCTION__)); | |||
3603 | Chain.erase(std::remove(Chain.begin(), Chain.end(), N), Chain.end()); | |||
3604 | }); | |||
3605 | Res = cast<MachineSDNode>(MorphNode(NodeToMatch, TargetOpc, VTList, | |||
3606 | Ops, EmitNodeInfo)); | |||
3607 | } | |||
3608 | ||||
3609 | // If the node had chain/glue results, update our notion of the current | |||
3610 | // chain and glue. | |||
3611 | if (EmitNodeInfo & OPFL_GlueOutput) { | |||
3612 | InputGlue = SDValue(Res, VTs.size()-1); | |||
3613 | if (EmitNodeInfo & OPFL_Chain) | |||
3614 | InputChain = SDValue(Res, VTs.size()-2); | |||
3615 | } else if (EmitNodeInfo & OPFL_Chain) | |||
3616 | InputChain = SDValue(Res, VTs.size()-1); | |||
3617 | ||||
3618 | // If the OPFL_MemRefs glue is set on this node, slap all of the | |||
3619 | // accumulated memrefs onto it. | |||
3620 | // | |||
3621 | // FIXME: This is vastly incorrect for patterns with multiple outputs | |||
3622 | // instructions that access memory and for ComplexPatterns that match | |||
3623 | // loads. | |||
3624 | if (EmitNodeInfo & OPFL_MemRefs) { | |||
3625 | // Only attach load or store memory operands if the generated | |||
3626 | // instruction may load or store. | |||
3627 | const MCInstrDesc &MCID = TII->get(TargetOpc); | |||
3628 | bool mayLoad = MCID.mayLoad(); | |||
3629 | bool mayStore = MCID.mayStore(); | |||
3630 | ||||
3631 | unsigned NumMemRefs = 0; | |||
3632 | for (SmallVectorImpl<MachineMemOperand *>::const_iterator I = | |||
3633 | MatchedMemRefs.begin(), E = MatchedMemRefs.end(); I != E; ++I) { | |||
3634 | if ((*I)->isLoad()) { | |||
3635 | if (mayLoad) | |||
3636 | ++NumMemRefs; | |||
3637 | } else if ((*I)->isStore()) { | |||
3638 | if (mayStore) | |||
3639 | ++NumMemRefs; | |||
3640 | } else { | |||
3641 | ++NumMemRefs; | |||
3642 | } | |||
3643 | } | |||
3644 | ||||
3645 | MachineSDNode::mmo_iterator MemRefs = | |||
3646 | MF->allocateMemRefsArray(NumMemRefs); | |||
3647 | ||||
3648 | MachineSDNode::mmo_iterator MemRefsPos = MemRefs; | |||
3649 | for (SmallVectorImpl<MachineMemOperand *>::const_iterator I = | |||
3650 | MatchedMemRefs.begin(), E = MatchedMemRefs.end(); I != E; ++I) { | |||
3651 | if ((*I)->isLoad()) { | |||
3652 | if (mayLoad) | |||
3653 | *MemRefsPos++ = *I; | |||
3654 | } else if ((*I)->isStore()) { | |||
3655 | if (mayStore) | |||
3656 | *MemRefsPos++ = *I; | |||
3657 | } else { | |||
3658 | *MemRefsPos++ = *I; | |||
3659 | } | |||
3660 | } | |||
3661 | ||||
3662 | Res->setMemRefs(MemRefs, MemRefs + NumMemRefs); | |||
3663 | } | |||
3664 | ||||
3665 | DEBUG(do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { if (!MatchedMemRefs.empty() && Res->memoperands_empty ()) dbgs() << " Dropping mem operands\n"; dbgs() << " " << (IsMorphNodeTo ? "Morphed" : "Created") << " node: "; Res->dump(CurDAG);; } } while (false) | |||
3666 | if (!MatchedMemRefs.empty() && Res->memoperands_empty())do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { if (!MatchedMemRefs.empty() && Res->memoperands_empty ()) dbgs() << " Dropping mem operands\n"; dbgs() << " " << (IsMorphNodeTo ? "Morphed" : "Created") << " node: "; Res->dump(CurDAG);; } } while (false) | |||
3667 | dbgs() << " Dropping mem operands\n";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { if (!MatchedMemRefs.empty() && Res->memoperands_empty ()) dbgs() << " Dropping mem operands\n"; dbgs() << " " << (IsMorphNodeTo ? "Morphed" : "Created") << " node: "; Res->dump(CurDAG);; } } while (false) | |||
3668 | dbgs() << " "do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { if (!MatchedMemRefs.empty() && Res->memoperands_empty ()) dbgs() << " Dropping mem operands\n"; dbgs() << " " << (IsMorphNodeTo ? "Morphed" : "Created") << " node: "; Res->dump(CurDAG);; } } while (false) | |||
3669 | << (IsMorphNodeTo ? "Morphed" : "Created")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { if (!MatchedMemRefs.empty() && Res->memoperands_empty ()) dbgs() << " Dropping mem operands\n"; dbgs() << " " << (IsMorphNodeTo ? "Morphed" : "Created") << " node: "; Res->dump(CurDAG);; } } while (false) | |||
3670 | << " node: ";do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { if (!MatchedMemRefs.empty() && Res->memoperands_empty ()) dbgs() << " Dropping mem operands\n"; dbgs() << " " << (IsMorphNodeTo ? "Morphed" : "Created") << " node: "; Res->dump(CurDAG);; } } while (false) | |||
3671 | Res->dump(CurDAG);do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { if (!MatchedMemRefs.empty() && Res->memoperands_empty ()) dbgs() << " Dropping mem operands\n"; dbgs() << " " << (IsMorphNodeTo ? "Morphed" : "Created") << " node: "; Res->dump(CurDAG);; } } while (false) | |||
3672 | )do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { if (!MatchedMemRefs.empty() && Res->memoperands_empty ()) dbgs() << " Dropping mem operands\n"; dbgs() << " " << (IsMorphNodeTo ? "Morphed" : "Created") << " node: "; Res->dump(CurDAG);; } } while (false); | |||
3673 | ||||
3674 | // If this was a MorphNodeTo then we're completely done! | |||
3675 | if (IsMorphNodeTo) { | |||
3676 | // Update chain uses. | |||
3677 | UpdateChains(Res, InputChain, ChainNodesMatched, true); | |||
3678 | return; | |||
3679 | } | |||
3680 | continue; | |||
3681 | } | |||
3682 | ||||
3683 | case OPC_CompleteMatch: { | |||
3684 | // The match has been completed, and any new nodes (if any) have been | |||
3685 | // created. Patch up references to the matched dag to use the newly | |||
3686 | // created nodes. | |||
3687 | unsigned NumResults = MatcherTable[MatcherIndex++]; | |||
3688 | ||||
3689 | for (unsigned i = 0; i != NumResults; ++i) { | |||
3690 | unsigned ResSlot = MatcherTable[MatcherIndex++]; | |||
3691 | if (ResSlot & 128) | |||
3692 | ResSlot = GetVBR(ResSlot, MatcherTable, MatcherIndex); | |||
3693 | ||||
3694 | assert(ResSlot < RecordedNodes.size() && "Invalid CompleteMatch")(static_cast <bool> (ResSlot < RecordedNodes.size() && "Invalid CompleteMatch") ? void (0) : __assert_fail ("ResSlot < RecordedNodes.size() && \"Invalid CompleteMatch\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3694, __extension__ __PRETTY_FUNCTION__)); | |||
3695 | SDValue Res = RecordedNodes[ResSlot].first; | |||
3696 | ||||
3697 | assert(i < NodeToMatch->getNumValues() &&(static_cast <bool> (i < NodeToMatch->getNumValues () && NodeToMatch->getValueType(i) != MVT::Other && NodeToMatch->getValueType(i) != MVT::Glue && "Invalid number of results to complete!" ) ? void (0) : __assert_fail ("i < NodeToMatch->getNumValues() && NodeToMatch->getValueType(i) != MVT::Other && NodeToMatch->getValueType(i) != MVT::Glue && \"Invalid number of results to complete!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3700, __extension__ __PRETTY_FUNCTION__)) | |||
3698 | NodeToMatch->getValueType(i) != MVT::Other &&(static_cast <bool> (i < NodeToMatch->getNumValues () && NodeToMatch->getValueType(i) != MVT::Other && NodeToMatch->getValueType(i) != MVT::Glue && "Invalid number of results to complete!" ) ? void (0) : __assert_fail ("i < NodeToMatch->getNumValues() && NodeToMatch->getValueType(i) != MVT::Other && NodeToMatch->getValueType(i) != MVT::Glue && \"Invalid number of results to complete!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3700, __extension__ __PRETTY_FUNCTION__)) | |||
3699 | NodeToMatch->getValueType(i) != MVT::Glue &&(static_cast <bool> (i < NodeToMatch->getNumValues () && NodeToMatch->getValueType(i) != MVT::Other && NodeToMatch->getValueType(i) != MVT::Glue && "Invalid number of results to complete!" ) ? void (0) : __assert_fail ("i < NodeToMatch->getNumValues() && NodeToMatch->getValueType(i) != MVT::Other && NodeToMatch->getValueType(i) != MVT::Glue && \"Invalid number of results to complete!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3700, __extension__ __PRETTY_FUNCTION__)) | |||
3700 | "Invalid number of results to complete!")(static_cast <bool> (i < NodeToMatch->getNumValues () && NodeToMatch->getValueType(i) != MVT::Other && NodeToMatch->getValueType(i) != MVT::Glue && "Invalid number of results to complete!" ) ? void (0) : __assert_fail ("i < NodeToMatch->getNumValues() && NodeToMatch->getValueType(i) != MVT::Other && NodeToMatch->getValueType(i) != MVT::Glue && \"Invalid number of results to complete!\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3700, __extension__ __PRETTY_FUNCTION__)); | |||
3701 | assert((NodeToMatch->getValueType(i) == Res.getValueType() ||(static_cast <bool> ((NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT ::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch-> getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && "invalid replacement") ? void (0) : __assert_fail ("(NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch->getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && \"invalid replacement\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3706, __extension__ __PRETTY_FUNCTION__)) | |||
3702 | NodeToMatch->getValueType(i) == MVT::iPTR ||(static_cast <bool> ((NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT ::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch-> getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && "invalid replacement") ? void (0) : __assert_fail ("(NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch->getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && \"invalid replacement\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3706, __extension__ __PRETTY_FUNCTION__)) | |||
3703 | Res.getValueType() == MVT::iPTR ||(static_cast <bool> ((NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT ::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch-> getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && "invalid replacement") ? void (0) : __assert_fail ("(NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch->getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && \"invalid replacement\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3706, __extension__ __PRETTY_FUNCTION__)) | |||
3704 | NodeToMatch->getValueType(i).getSizeInBits() ==(static_cast <bool> ((NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT ::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch-> getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && "invalid replacement") ? void (0) : __assert_fail ("(NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch->getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && \"invalid replacement\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3706, __extension__ __PRETTY_FUNCTION__)) | |||
3705 | Res.getValueSizeInBits()) &&(static_cast <bool> ((NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT ::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch-> getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && "invalid replacement") ? void (0) : __assert_fail ("(NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch->getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && \"invalid replacement\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3706, __extension__ __PRETTY_FUNCTION__)) | |||
3706 | "invalid replacement")(static_cast <bool> ((NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT ::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch-> getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && "invalid replacement") ? void (0) : __assert_fail ("(NodeToMatch->getValueType(i) == Res.getValueType() || NodeToMatch->getValueType(i) == MVT::iPTR || Res.getValueType() == MVT::iPTR || NodeToMatch->getValueType(i).getSizeInBits() == Res.getValueSizeInBits()) && \"invalid replacement\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3706, __extension__ __PRETTY_FUNCTION__)); | |||
3707 | CurDAG->ReplaceAllUsesOfValueWith(SDValue(NodeToMatch, i), Res); | |||
3708 | } | |||
3709 | ||||
3710 | // Update chain uses. | |||
3711 | UpdateChains(NodeToMatch, InputChain, ChainNodesMatched, false); | |||
3712 | ||||
3713 | // If the root node defines glue, we need to update it to the glue result. | |||
3714 | // TODO: This never happens in our tests and I think it can be removed / | |||
3715 | // replaced with an assert, but if we do it this the way the change is | |||
3716 | // NFC. | |||
3717 | if (NodeToMatch->getValueType(NodeToMatch->getNumValues() - 1) == | |||
3718 | MVT::Glue && | |||
3719 | InputGlue.getNode()) | |||
3720 | CurDAG->ReplaceAllUsesOfValueWith( | |||
3721 | SDValue(NodeToMatch, NodeToMatch->getNumValues() - 1), InputGlue); | |||
3722 | ||||
3723 | assert(NodeToMatch->use_empty() &&(static_cast <bool> (NodeToMatch->use_empty() && "Didn't replace all uses of the node?") ? void (0) : __assert_fail ("NodeToMatch->use_empty() && \"Didn't replace all uses of the node?\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3724, __extension__ __PRETTY_FUNCTION__)) | |||
3724 | "Didn't replace all uses of the node?")(static_cast <bool> (NodeToMatch->use_empty() && "Didn't replace all uses of the node?") ? void (0) : __assert_fail ("NodeToMatch->use_empty() && \"Didn't replace all uses of the node?\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3724, __extension__ __PRETTY_FUNCTION__)); | |||
3725 | CurDAG->RemoveDeadNode(NodeToMatch); | |||
3726 | ||||
3727 | return; | |||
3728 | } | |||
3729 | } | |||
3730 | ||||
3731 | // If the code reached this point, then the match failed. See if there is | |||
3732 | // another child to try in the current 'Scope', otherwise pop it until we | |||
3733 | // find a case to check. | |||
3734 | DEBUG(dbgs() << " Match failed at index " << CurrentOpcodeIndex << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " Match failed at index " << CurrentOpcodeIndex << "\n"; } } while (false); | |||
3735 | ++NumDAGIselRetries; | |||
3736 | while (true) { | |||
3737 | if (MatchScopes.empty()) { | |||
3738 | CannotYetSelect(NodeToMatch); | |||
3739 | return; | |||
3740 | } | |||
3741 | ||||
3742 | // Restore the interpreter state back to the point where the scope was | |||
3743 | // formed. | |||
3744 | MatchScope &LastScope = MatchScopes.back(); | |||
3745 | RecordedNodes.resize(LastScope.NumRecordedNodes); | |||
3746 | NodeStack.clear(); | |||
3747 | NodeStack.append(LastScope.NodeStack.begin(), LastScope.NodeStack.end()); | |||
3748 | N = NodeStack.back(); | |||
3749 | ||||
3750 | if (LastScope.NumMatchedMemRefs != MatchedMemRefs.size()) | |||
3751 | MatchedMemRefs.resize(LastScope.NumMatchedMemRefs); | |||
3752 | MatcherIndex = LastScope.FailIndex; | |||
3753 | ||||
3754 | DEBUG(dbgs() << " Continuing at " << MatcherIndex << "\n")do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType ("isel")) { dbgs() << " Continuing at " << MatcherIndex << "\n"; } } while (false); | |||
3755 | ||||
3756 | InputChain = LastScope.InputChain; | |||
3757 | InputGlue = LastScope.InputGlue; | |||
3758 | if (!LastScope.HasChainNodesMatched) | |||
3759 | ChainNodesMatched.clear(); | |||
3760 | ||||
3761 | // Check to see what the offset is at the new MatcherIndex. If it is zero | |||
3762 | // we have reached the end of this scope, otherwise we have another child | |||
3763 | // in the current scope to try. | |||
3764 | unsigned NumToSkip = MatcherTable[MatcherIndex++]; | |||
3765 | if (NumToSkip & 128) | |||
3766 | NumToSkip = GetVBR(NumToSkip, MatcherTable, MatcherIndex); | |||
3767 | ||||
3768 | // If we have another child in this scope to match, update FailIndex and | |||
3769 | // try it. | |||
3770 | if (NumToSkip != 0) { | |||
3771 | LastScope.FailIndex = MatcherIndex+NumToSkip; | |||
3772 | break; | |||
3773 | } | |||
3774 | ||||
3775 | // End of this scope, pop it and try the next child in the containing | |||
3776 | // scope. | |||
3777 | MatchScopes.pop_back(); | |||
3778 | } | |||
3779 | } | |||
3780 | } | |||
3781 | ||||
3782 | bool SelectionDAGISel::isOrEquivalentToAdd(const SDNode *N) const { | |||
3783 | assert(N->getOpcode() == ISD::OR && "Unexpected opcode")(static_cast <bool> (N->getOpcode() == ISD::OR && "Unexpected opcode") ? void (0) : __assert_fail ("N->getOpcode() == ISD::OR && \"Unexpected opcode\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3783, __extension__ __PRETTY_FUNCTION__)); | |||
3784 | auto *C = dyn_cast<ConstantSDNode>(N->getOperand(1)); | |||
3785 | if (!C) | |||
3786 | return false; | |||
3787 | ||||
3788 | // Detect when "or" is used to add an offset to a stack object. | |||
3789 | if (auto *FN = dyn_cast<FrameIndexSDNode>(N->getOperand(0))) { | |||
3790 | MachineFrameInfo &MFI = MF->getFrameInfo(); | |||
3791 | unsigned A = MFI.getObjectAlignment(FN->getIndex()); | |||
3792 | assert(isPowerOf2_32(A) && "Unexpected alignment")(static_cast <bool> (isPowerOf2_32(A) && "Unexpected alignment" ) ? void (0) : __assert_fail ("isPowerOf2_32(A) && \"Unexpected alignment\"" , "/build/llvm-toolchain-snapshot-7~svn326551/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp" , 3792, __extension__ __PRETTY_FUNCTION__)); | |||
3793 | int32_t Off = C->getSExtValue(); | |||
3794 | // If the alleged offset fits in the zero bits guaranteed by | |||
3795 | // the alignment, then this or is really an add. | |||
3796 | return (Off >= 0) && (((A - 1) & Off) == unsigned(Off)); | |||
3797 | } | |||
3798 | return false; | |||
3799 | } | |||
3800 | ||||
3801 | void SelectionDAGISel::CannotYetSelect(SDNode *N) { | |||
3802 | std::string msg; | |||
3803 | raw_string_ostream Msg(msg); | |||
3804 | Msg << "Cannot select: "; | |||
3805 | ||||
3806 | if (N->getOpcode() != ISD::INTRINSIC_W_CHAIN && | |||
3807 | N->getOpcode() != ISD::INTRINSIC_WO_CHAIN && | |||
3808 | N->getOpcode() != ISD::INTRINSIC_VOID) { | |||
3809 | N->printrFull(Msg, CurDAG); | |||
3810 | Msg << "\nIn function: " << MF->getName(); | |||
3811 | } else { | |||
3812 | bool HasInputChain = N->getOperand(0).getValueType() == MVT::Other; | |||
3813 | unsigned iid = | |||
3814 | cast<ConstantSDNode>(N->getOperand(HasInputChain))->getZExtValue(); | |||
3815 | if (iid < Intrinsic::num_intrinsics) | |||
3816 | Msg << "intrinsic %" << Intrinsic::getName((Intrinsic::ID)iid, None); | |||
3817 | else if (const TargetIntrinsicInfo *TII = TM.getIntrinsicInfo()) | |||
3818 | Msg << "target intrinsic %" << TII->getName(iid); | |||
3819 | else | |||
3820 | Msg << "unknown intrinsic #" << iid; | |||
3821 | } | |||
3822 | report_fatal_error(Msg.str()); | |||
3823 | } | |||
3824 | ||||
3825 | char SelectionDAGISel::ID = 0; |