Bug Summary

File:lib/Target/SystemZ/SystemZInstrInfo.cpp
Warning:line 1621, column 24
The result of the right shift is undefined due to shifting by '4294967295', which is greater or equal to the width of type 'uint64_t'

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name SystemZInstrInfo.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/lib/Target/SystemZ -I /build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ -I /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn329677/include -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn329677/build-llvm/lib/Target/SystemZ -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-04-11-031539-24776-1 -x c++ /build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp
1//===-- SystemZInstrInfo.cpp - SystemZ instruction information ------------===//
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 file contains the SystemZ implementation of the TargetInstrInfo class.
11//
12//===----------------------------------------------------------------------===//
13
14#include "SystemZInstrInfo.h"
15#include "MCTargetDesc/SystemZMCTargetDesc.h"
16#include "SystemZ.h"
17#include "SystemZInstrBuilder.h"
18#include "SystemZSubtarget.h"
19#include "llvm/ADT/Statistic.h"
20#include "llvm/CodeGen/LiveInterval.h"
21#include "llvm/CodeGen/LiveIntervals.h"
22#include "llvm/CodeGen/LiveVariables.h"
23#include "llvm/CodeGen/MachineBasicBlock.h"
24#include "llvm/CodeGen/MachineFrameInfo.h"
25#include "llvm/CodeGen/MachineFunction.h"
26#include "llvm/CodeGen/MachineInstr.h"
27#include "llvm/CodeGen/MachineMemOperand.h"
28#include "llvm/CodeGen/MachineOperand.h"
29#include "llvm/CodeGen/MachineRegisterInfo.h"
30#include "llvm/CodeGen/SlotIndexes.h"
31#include "llvm/CodeGen/TargetInstrInfo.h"
32#include "llvm/CodeGen/TargetSubtargetInfo.h"
33#include "llvm/MC/MCInstrDesc.h"
34#include "llvm/MC/MCRegisterInfo.h"
35#include "llvm/Support/BranchProbability.h"
36#include "llvm/Support/ErrorHandling.h"
37#include "llvm/Support/MathExtras.h"
38#include "llvm/Target/TargetMachine.h"
39#include <cassert>
40#include <cstdint>
41#include <iterator>
42
43using namespace llvm;
44
45#define GET_INSTRINFO_CTOR_DTOR
46#define GET_INSTRMAP_INFO
47#include "SystemZGenInstrInfo.inc"
48
49#define DEBUG_TYPE"systemz-II" "systemz-II"
50STATISTIC(LOCRMuxJumps, "Number of LOCRMux jump-sequences (lower is better)")static llvm::Statistic LOCRMuxJumps = {"systemz-II", "LOCRMuxJumps"
, "Number of LOCRMux jump-sequences (lower is better)", {0}, {
false}}
;
51
52// Return a mask with Count low bits set.
53static uint64_t allOnes(unsigned int Count) {
54 return Count == 0 ? 0 : (uint64_t(1) << (Count - 1) << 1) - 1;
55}
56
57// Reg should be a 32-bit GPR. Return true if it is a high register rather
58// than a low register.
59static bool isHighReg(unsigned int Reg) {
60 if (SystemZ::GRH32BitRegClass.contains(Reg))
61 return true;
62 assert(SystemZ::GR32BitRegClass.contains(Reg) && "Invalid GRX32")(static_cast <bool> (SystemZ::GR32BitRegClass.contains(
Reg) && "Invalid GRX32") ? void (0) : __assert_fail (
"SystemZ::GR32BitRegClass.contains(Reg) && \"Invalid GRX32\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 62, __extension__ __PRETTY_FUNCTION__))
;
63 return false;
64}
65
66// Pin the vtable to this file.
67void SystemZInstrInfo::anchor() {}
68
69SystemZInstrInfo::SystemZInstrInfo(SystemZSubtarget &sti)
70 : SystemZGenInstrInfo(SystemZ::ADJCALLSTACKDOWN, SystemZ::ADJCALLSTACKUP),
71 RI(), STI(sti) {
72}
73
74// MI is a 128-bit load or store. Split it into two 64-bit loads or stores,
75// each having the opcode given by NewOpcode.
76void SystemZInstrInfo::splitMove(MachineBasicBlock::iterator MI,
77 unsigned NewOpcode) const {
78 MachineBasicBlock *MBB = MI->getParent();
79 MachineFunction &MF = *MBB->getParent();
80
81 // Get two load or store instructions. Use the original instruction for one
82 // of them (arbitrarily the second here) and create a clone for the other.
83 MachineInstr *EarlierMI = MF.CloneMachineInstr(&*MI);
84 MBB->insert(MI, EarlierMI);
85
86 // Set up the two 64-bit registers and remember super reg and its flags.
87 MachineOperand &HighRegOp = EarlierMI->getOperand(0);
88 MachineOperand &LowRegOp = MI->getOperand(0);
89 unsigned Reg128 = LowRegOp.getReg();
90 unsigned Reg128Killed = getKillRegState(LowRegOp.isKill());
91 unsigned Reg128Undef = getUndefRegState(LowRegOp.isUndef());
92 HighRegOp.setReg(RI.getSubReg(HighRegOp.getReg(), SystemZ::subreg_h64));
93 LowRegOp.setReg(RI.getSubReg(LowRegOp.getReg(), SystemZ::subreg_l64));
94
95 if (MI->mayStore()) {
96 // Add implicit uses of the super register in case one of the subregs is
97 // undefined. We could track liveness and skip storing an undefined
98 // subreg, but this is hopefully rare (discovered with llvm-stress).
99 // If Reg128 was killed, set kill flag on MI.
100 unsigned Reg128UndefImpl = (Reg128Undef | RegState::Implicit);
101 MachineInstrBuilder(MF, EarlierMI).addReg(Reg128, Reg128UndefImpl);
102 MachineInstrBuilder(MF, MI).addReg(Reg128, (Reg128UndefImpl | Reg128Killed));
103 }
104
105 // The address in the first (high) instruction is already correct.
106 // Adjust the offset in the second (low) instruction.
107 MachineOperand &HighOffsetOp = EarlierMI->getOperand(2);
108 MachineOperand &LowOffsetOp = MI->getOperand(2);
109 LowOffsetOp.setImm(LowOffsetOp.getImm() + 8);
110
111 // Clear the kill flags on the registers in the first instruction.
112 if (EarlierMI->getOperand(0).isReg() && EarlierMI->getOperand(0).isUse())
113 EarlierMI->getOperand(0).setIsKill(false);
114 EarlierMI->getOperand(1).setIsKill(false);
115 EarlierMI->getOperand(3).setIsKill(false);
116
117 // Set the opcodes.
118 unsigned HighOpcode = getOpcodeForOffset(NewOpcode, HighOffsetOp.getImm());
119 unsigned LowOpcode = getOpcodeForOffset(NewOpcode, LowOffsetOp.getImm());
120 assert(HighOpcode && LowOpcode && "Both offsets should be in range")(static_cast <bool> (HighOpcode && LowOpcode &&
"Both offsets should be in range") ? void (0) : __assert_fail
("HighOpcode && LowOpcode && \"Both offsets should be in range\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 120, __extension__ __PRETTY_FUNCTION__))
;
121
122 EarlierMI->setDesc(get(HighOpcode));
123 MI->setDesc(get(LowOpcode));
124}
125
126// Split ADJDYNALLOC instruction MI.
127void SystemZInstrInfo::splitAdjDynAlloc(MachineBasicBlock::iterator MI) const {
128 MachineBasicBlock *MBB = MI->getParent();
129 MachineFunction &MF = *MBB->getParent();
130 MachineFrameInfo &MFFrame = MF.getFrameInfo();
131 MachineOperand &OffsetMO = MI->getOperand(2);
132
133 uint64_t Offset = (MFFrame.getMaxCallFrameSize() +
134 SystemZMC::CallFrameSize +
135 OffsetMO.getImm());
136 unsigned NewOpcode = getOpcodeForOffset(SystemZ::LA, Offset);
137 assert(NewOpcode && "No support for huge argument lists yet")(static_cast <bool> (NewOpcode && "No support for huge argument lists yet"
) ? void (0) : __assert_fail ("NewOpcode && \"No support for huge argument lists yet\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 137, __extension__ __PRETTY_FUNCTION__))
;
138 MI->setDesc(get(NewOpcode));
139 OffsetMO.setImm(Offset);
140}
141
142// MI is an RI-style pseudo instruction. Replace it with LowOpcode
143// if the first operand is a low GR32 and HighOpcode if the first operand
144// is a high GR32. ConvertHigh is true if LowOpcode takes a signed operand
145// and HighOpcode takes an unsigned 32-bit operand. In those cases,
146// MI has the same kind of operand as LowOpcode, so needs to be converted
147// if HighOpcode is used.
148void SystemZInstrInfo::expandRIPseudo(MachineInstr &MI, unsigned LowOpcode,
149 unsigned HighOpcode,
150 bool ConvertHigh) const {
151 unsigned Reg = MI.getOperand(0).getReg();
152 bool IsHigh = isHighReg(Reg);
153 MI.setDesc(get(IsHigh ? HighOpcode : LowOpcode));
154 if (IsHigh && ConvertHigh)
155 MI.getOperand(1).setImm(uint32_t(MI.getOperand(1).getImm()));
156}
157
158// MI is a three-operand RIE-style pseudo instruction. Replace it with
159// LowOpcodeK if the registers are both low GR32s, otherwise use a move
160// followed by HighOpcode or LowOpcode, depending on whether the target
161// is a high or low GR32.
162void SystemZInstrInfo::expandRIEPseudo(MachineInstr &MI, unsigned LowOpcode,
163 unsigned LowOpcodeK,
164 unsigned HighOpcode) const {
165 unsigned DestReg = MI.getOperand(0).getReg();
166 unsigned SrcReg = MI.getOperand(1).getReg();
167 bool DestIsHigh = isHighReg(DestReg);
168 bool SrcIsHigh = isHighReg(SrcReg);
169 if (!DestIsHigh && !SrcIsHigh)
170 MI.setDesc(get(LowOpcodeK));
171 else {
172 emitGRX32Move(*MI.getParent(), MI, MI.getDebugLoc(), DestReg, SrcReg,
173 SystemZ::LR, 32, MI.getOperand(1).isKill(),
174 MI.getOperand(1).isUndef());
175 MI.setDesc(get(DestIsHigh ? HighOpcode : LowOpcode));
176 MI.getOperand(1).setReg(DestReg);
177 MI.tieOperands(0, 1);
178 }
179}
180
181// MI is an RXY-style pseudo instruction. Replace it with LowOpcode
182// if the first operand is a low GR32 and HighOpcode if the first operand
183// is a high GR32.
184void SystemZInstrInfo::expandRXYPseudo(MachineInstr &MI, unsigned LowOpcode,
185 unsigned HighOpcode) const {
186 unsigned Reg = MI.getOperand(0).getReg();
187 unsigned Opcode = getOpcodeForOffset(isHighReg(Reg) ? HighOpcode : LowOpcode,
188 MI.getOperand(2).getImm());
189 MI.setDesc(get(Opcode));
190}
191
192// MI is a load-on-condition pseudo instruction with a single register
193// (source or destination) operand. Replace it with LowOpcode if the
194// register is a low GR32 and HighOpcode if the register is a high GR32.
195void SystemZInstrInfo::expandLOCPseudo(MachineInstr &MI, unsigned LowOpcode,
196 unsigned HighOpcode) const {
197 unsigned Reg = MI.getOperand(0).getReg();
198 unsigned Opcode = isHighReg(Reg) ? HighOpcode : LowOpcode;
199 MI.setDesc(get(Opcode));
200}
201
202// MI is a load-register-on-condition pseudo instruction. Replace it with
203// LowOpcode if source and destination are both low GR32s and HighOpcode if
204// source and destination are both high GR32s.
205void SystemZInstrInfo::expandLOCRPseudo(MachineInstr &MI, unsigned LowOpcode,
206 unsigned HighOpcode) const {
207 unsigned DestReg = MI.getOperand(0).getReg();
208 unsigned SrcReg = MI.getOperand(2).getReg();
209 bool DestIsHigh = isHighReg(DestReg);
210 bool SrcIsHigh = isHighReg(SrcReg);
211
212 if (!DestIsHigh && !SrcIsHigh)
213 MI.setDesc(get(LowOpcode));
214 else if (DestIsHigh && SrcIsHigh)
215 MI.setDesc(get(HighOpcode));
216 else
217 LOCRMuxJumps++;
218
219 // If we were unable to implement the pseudo with a single instruction, we
220 // need to convert it back into a branch sequence. This cannot be done here
221 // since the caller of expandPostRAPseudo does not handle changes to the CFG
222 // correctly. This change is defered to the SystemZExpandPseudo pass.
223}
224
225// MI is an RR-style pseudo instruction that zero-extends the low Size bits
226// of one GRX32 into another. Replace it with LowOpcode if both operands
227// are low registers, otherwise use RISB[LH]G.
228void SystemZInstrInfo::expandZExtPseudo(MachineInstr &MI, unsigned LowOpcode,
229 unsigned Size) const {
230 MachineInstrBuilder MIB =
231 emitGRX32Move(*MI.getParent(), MI, MI.getDebugLoc(),
232 MI.getOperand(0).getReg(), MI.getOperand(1).getReg(), LowOpcode,
233 Size, MI.getOperand(1).isKill(), MI.getOperand(1).isUndef());
234
235 // Keep the remaining operands as-is.
236 for (unsigned I = 2; I < MI.getNumOperands(); ++I)
237 MIB.add(MI.getOperand(I));
238
239 MI.eraseFromParent();
240}
241
242void SystemZInstrInfo::expandLoadStackGuard(MachineInstr *MI) const {
243 MachineBasicBlock *MBB = MI->getParent();
244 MachineFunction &MF = *MBB->getParent();
245 const unsigned Reg64 = MI->getOperand(0).getReg();
246 const unsigned Reg32 = RI.getSubReg(Reg64, SystemZ::subreg_l32);
247
248 // EAR can only load the low subregister so us a shift for %a0 to produce
249 // the GR containing %a0 and %a1.
250
251 // ear <reg>, %a0
252 BuildMI(*MBB, MI, MI->getDebugLoc(), get(SystemZ::EAR), Reg32)
253 .addReg(SystemZ::A0)
254 .addReg(Reg64, RegState::ImplicitDefine);
255
256 // sllg <reg>, <reg>, 32
257 BuildMI(*MBB, MI, MI->getDebugLoc(), get(SystemZ::SLLG), Reg64)
258 .addReg(Reg64)
259 .addReg(0)
260 .addImm(32);
261
262 // ear <reg>, %a1
263 BuildMI(*MBB, MI, MI->getDebugLoc(), get(SystemZ::EAR), Reg32)
264 .addReg(SystemZ::A1);
265
266 // lg <reg>, 40(<reg>)
267 MI->setDesc(get(SystemZ::LG));
268 MachineInstrBuilder(MF, MI).addReg(Reg64).addImm(40).addReg(0);
269}
270
271// Emit a zero-extending move from 32-bit GPR SrcReg to 32-bit GPR
272// DestReg before MBBI in MBB. Use LowLowOpcode when both DestReg and SrcReg
273// are low registers, otherwise use RISB[LH]G. Size is the number of bits
274// taken from the low end of SrcReg (8 for LLCR, 16 for LLHR and 32 for LR).
275// KillSrc is true if this move is the last use of SrcReg.
276MachineInstrBuilder
277SystemZInstrInfo::emitGRX32Move(MachineBasicBlock &MBB,
278 MachineBasicBlock::iterator MBBI,
279 const DebugLoc &DL, unsigned DestReg,
280 unsigned SrcReg, unsigned LowLowOpcode,
281 unsigned Size, bool KillSrc,
282 bool UndefSrc) const {
283 unsigned Opcode;
284 bool DestIsHigh = isHighReg(DestReg);
285 bool SrcIsHigh = isHighReg(SrcReg);
286 if (DestIsHigh && SrcIsHigh)
287 Opcode = SystemZ::RISBHH;
288 else if (DestIsHigh && !SrcIsHigh)
289 Opcode = SystemZ::RISBHL;
290 else if (!DestIsHigh && SrcIsHigh)
291 Opcode = SystemZ::RISBLH;
292 else {
293 return BuildMI(MBB, MBBI, DL, get(LowLowOpcode), DestReg)
294 .addReg(SrcReg, getKillRegState(KillSrc) | getUndefRegState(UndefSrc));
295 }
296 unsigned Rotate = (DestIsHigh != SrcIsHigh ? 32 : 0);
297 return BuildMI(MBB, MBBI, DL, get(Opcode), DestReg)
298 .addReg(DestReg, RegState::Undef)
299 .addReg(SrcReg, getKillRegState(KillSrc) | getUndefRegState(UndefSrc))
300 .addImm(32 - Size).addImm(128 + 31).addImm(Rotate);
301}
302
303MachineInstr *SystemZInstrInfo::commuteInstructionImpl(MachineInstr &MI,
304 bool NewMI,
305 unsigned OpIdx1,
306 unsigned OpIdx2) const {
307 auto cloneIfNew = [NewMI](MachineInstr &MI) -> MachineInstr & {
308 if (NewMI)
309 return *MI.getParent()->getParent()->CloneMachineInstr(&MI);
310 return MI;
311 };
312
313 switch (MI.getOpcode()) {
314 case SystemZ::LOCRMux:
315 case SystemZ::LOCFHR:
316 case SystemZ::LOCR:
317 case SystemZ::LOCGR: {
318 auto &WorkingMI = cloneIfNew(MI);
319 // Invert condition.
320 unsigned CCValid = WorkingMI.getOperand(3).getImm();
321 unsigned CCMask = WorkingMI.getOperand(4).getImm();
322 WorkingMI.getOperand(4).setImm(CCMask ^ CCValid);
323 return TargetInstrInfo::commuteInstructionImpl(WorkingMI, /*NewMI=*/false,
324 OpIdx1, OpIdx2);
325 }
326 default:
327 return TargetInstrInfo::commuteInstructionImpl(MI, NewMI, OpIdx1, OpIdx2);
328 }
329}
330
331// If MI is a simple load or store for a frame object, return the register
332// it loads or stores and set FrameIndex to the index of the frame object.
333// Return 0 otherwise.
334//
335// Flag is SimpleBDXLoad for loads and SimpleBDXStore for stores.
336static int isSimpleMove(const MachineInstr &MI, int &FrameIndex,
337 unsigned Flag) {
338 const MCInstrDesc &MCID = MI.getDesc();
339 if ((MCID.TSFlags & Flag) && MI.getOperand(1).isFI() &&
340 MI.getOperand(2).getImm() == 0 && MI.getOperand(3).getReg() == 0) {
341 FrameIndex = MI.getOperand(1).getIndex();
342 return MI.getOperand(0).getReg();
343 }
344 return 0;
345}
346
347unsigned SystemZInstrInfo::isLoadFromStackSlot(const MachineInstr &MI,
348 int &FrameIndex) const {
349 return isSimpleMove(MI, FrameIndex, SystemZII::SimpleBDXLoad);
350}
351
352unsigned SystemZInstrInfo::isStoreToStackSlot(const MachineInstr &MI,
353 int &FrameIndex) const {
354 return isSimpleMove(MI, FrameIndex, SystemZII::SimpleBDXStore);
355}
356
357bool SystemZInstrInfo::isStackSlotCopy(const MachineInstr &MI,
358 int &DestFrameIndex,
359 int &SrcFrameIndex) const {
360 // Check for MVC 0(Length,FI1),0(FI2)
361 const MachineFrameInfo &MFI = MI.getParent()->getParent()->getFrameInfo();
362 if (MI.getOpcode() != SystemZ::MVC || !MI.getOperand(0).isFI() ||
363 MI.getOperand(1).getImm() != 0 || !MI.getOperand(3).isFI() ||
364 MI.getOperand(4).getImm() != 0)
365 return false;
366
367 // Check that Length covers the full slots.
368 int64_t Length = MI.getOperand(2).getImm();
369 unsigned FI1 = MI.getOperand(0).getIndex();
370 unsigned FI2 = MI.getOperand(3).getIndex();
371 if (MFI.getObjectSize(FI1) != Length ||
372 MFI.getObjectSize(FI2) != Length)
373 return false;
374
375 DestFrameIndex = FI1;
376 SrcFrameIndex = FI2;
377 return true;
378}
379
380bool SystemZInstrInfo::analyzeBranch(MachineBasicBlock &MBB,
381 MachineBasicBlock *&TBB,
382 MachineBasicBlock *&FBB,
383 SmallVectorImpl<MachineOperand> &Cond,
384 bool AllowModify) const {
385 // Most of the code and comments here are boilerplate.
386
387 // Start from the bottom of the block and work up, examining the
388 // terminator instructions.
389 MachineBasicBlock::iterator I = MBB.end();
390 while (I != MBB.begin()) {
391 --I;
392 if (I->isDebugValue())
393 continue;
394
395 // Working from the bottom, when we see a non-terminator instruction, we're
396 // done.
397 if (!isUnpredicatedTerminator(*I))
398 break;
399
400 // A terminator that isn't a branch can't easily be handled by this
401 // analysis.
402 if (!I->isBranch())
403 return true;
404
405 // Can't handle indirect branches.
406 SystemZII::Branch Branch(getBranchInfo(*I));
407 if (!Branch.Target->isMBB())
408 return true;
409
410 // Punt on compound branches.
411 if (Branch.Type != SystemZII::BranchNormal)
412 return true;
413
414 if (Branch.CCMask == SystemZ::CCMASK_ANY) {
415 // Handle unconditional branches.
416 if (!AllowModify) {
417 TBB = Branch.Target->getMBB();
418 continue;
419 }
420
421 // If the block has any instructions after a JMP, delete them.
422 while (std::next(I) != MBB.end())
423 std::next(I)->eraseFromParent();
424
425 Cond.clear();
426 FBB = nullptr;
427
428 // Delete the JMP if it's equivalent to a fall-through.
429 if (MBB.isLayoutSuccessor(Branch.Target->getMBB())) {
430 TBB = nullptr;
431 I->eraseFromParent();
432 I = MBB.end();
433 continue;
434 }
435
436 // TBB is used to indicate the unconditinal destination.
437 TBB = Branch.Target->getMBB();
438 continue;
439 }
440
441 // Working from the bottom, handle the first conditional branch.
442 if (Cond.empty()) {
443 // FIXME: add X86-style branch swap
444 FBB = TBB;
445 TBB = Branch.Target->getMBB();
446 Cond.push_back(MachineOperand::CreateImm(Branch.CCValid));
447 Cond.push_back(MachineOperand::CreateImm(Branch.CCMask));
448 continue;
449 }
450
451 // Handle subsequent conditional branches.
452 assert(Cond.size() == 2 && TBB && "Should have seen a conditional branch")(static_cast <bool> (Cond.size() == 2 && TBB &&
"Should have seen a conditional branch") ? void (0) : __assert_fail
("Cond.size() == 2 && TBB && \"Should have seen a conditional branch\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 452, __extension__ __PRETTY_FUNCTION__))
;
453
454 // Only handle the case where all conditional branches branch to the same
455 // destination.
456 if (TBB != Branch.Target->getMBB())
457 return true;
458
459 // If the conditions are the same, we can leave them alone.
460 unsigned OldCCValid = Cond[0].getImm();
461 unsigned OldCCMask = Cond[1].getImm();
462 if (OldCCValid == Branch.CCValid && OldCCMask == Branch.CCMask)
463 continue;
464
465 // FIXME: Try combining conditions like X86 does. Should be easy on Z!
466 return false;
467 }
468
469 return false;
470}
471
472unsigned SystemZInstrInfo::removeBranch(MachineBasicBlock &MBB,
473 int *BytesRemoved) const {
474 assert(!BytesRemoved && "code size not handled")(static_cast <bool> (!BytesRemoved && "code size not handled"
) ? void (0) : __assert_fail ("!BytesRemoved && \"code size not handled\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 474, __extension__ __PRETTY_FUNCTION__))
;
475
476 // Most of the code and comments here are boilerplate.
477 MachineBasicBlock::iterator I = MBB.end();
478 unsigned Count = 0;
479
480 while (I != MBB.begin()) {
481 --I;
482 if (I->isDebugValue())
483 continue;
484 if (!I->isBranch())
485 break;
486 if (!getBranchInfo(*I).Target->isMBB())
487 break;
488 // Remove the branch.
489 I->eraseFromParent();
490 I = MBB.end();
491 ++Count;
492 }
493
494 return Count;
495}
496
497bool SystemZInstrInfo::
498reverseBranchCondition(SmallVectorImpl<MachineOperand> &Cond) const {
499 assert(Cond.size() == 2 && "Invalid condition")(static_cast <bool> (Cond.size() == 2 && "Invalid condition"
) ? void (0) : __assert_fail ("Cond.size() == 2 && \"Invalid condition\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 499, __extension__ __PRETTY_FUNCTION__))
;
500 Cond[1].setImm(Cond[1].getImm() ^ Cond[0].getImm());
501 return false;
502}
503
504unsigned SystemZInstrInfo::insertBranch(MachineBasicBlock &MBB,
505 MachineBasicBlock *TBB,
506 MachineBasicBlock *FBB,
507 ArrayRef<MachineOperand> Cond,
508 const DebugLoc &DL,
509 int *BytesAdded) const {
510 // In this function we output 32-bit branches, which should always
511 // have enough range. They can be shortened and relaxed by later code
512 // in the pipeline, if desired.
513
514 // Shouldn't be a fall through.
515 assert(TBB && "insertBranch must not be told to insert a fallthrough")(static_cast <bool> (TBB && "insertBranch must not be told to insert a fallthrough"
) ? void (0) : __assert_fail ("TBB && \"insertBranch must not be told to insert a fallthrough\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 515, __extension__ __PRETTY_FUNCTION__))
;
516 assert((Cond.size() == 2 || Cond.size() == 0) &&(static_cast <bool> ((Cond.size() == 2 || Cond.size() ==
0) && "SystemZ branch conditions have one component!"
) ? void (0) : __assert_fail ("(Cond.size() == 2 || Cond.size() == 0) && \"SystemZ branch conditions have one component!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 517, __extension__ __PRETTY_FUNCTION__))
517 "SystemZ branch conditions have one component!")(static_cast <bool> ((Cond.size() == 2 || Cond.size() ==
0) && "SystemZ branch conditions have one component!"
) ? void (0) : __assert_fail ("(Cond.size() == 2 || Cond.size() == 0) && \"SystemZ branch conditions have one component!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 517, __extension__ __PRETTY_FUNCTION__))
;
518 assert(!BytesAdded && "code size not handled")(static_cast <bool> (!BytesAdded && "code size not handled"
) ? void (0) : __assert_fail ("!BytesAdded && \"code size not handled\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 518, __extension__ __PRETTY_FUNCTION__))
;
519
520 if (Cond.empty()) {
521 // Unconditional branch?
522 assert(!FBB && "Unconditional branch with multiple successors!")(static_cast <bool> (!FBB && "Unconditional branch with multiple successors!"
) ? void (0) : __assert_fail ("!FBB && \"Unconditional branch with multiple successors!\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 522, __extension__ __PRETTY_FUNCTION__))
;
523 BuildMI(&MBB, DL, get(SystemZ::J)).addMBB(TBB);
524 return 1;
525 }
526
527 // Conditional branch.
528 unsigned Count = 0;
529 unsigned CCValid = Cond[0].getImm();
530 unsigned CCMask = Cond[1].getImm();
531 BuildMI(&MBB, DL, get(SystemZ::BRC))
532 .addImm(CCValid).addImm(CCMask).addMBB(TBB);
533 ++Count;
534
535 if (FBB) {
536 // Two-way Conditional branch. Insert the second branch.
537 BuildMI(&MBB, DL, get(SystemZ::J)).addMBB(FBB);
538 ++Count;
539 }
540 return Count;
541}
542
543bool SystemZInstrInfo::analyzeCompare(const MachineInstr &MI, unsigned &SrcReg,
544 unsigned &SrcReg2, int &Mask,
545 int &Value) const {
546 assert(MI.isCompare() && "Caller should have checked for a comparison")(static_cast <bool> (MI.isCompare() && "Caller should have checked for a comparison"
) ? void (0) : __assert_fail ("MI.isCompare() && \"Caller should have checked for a comparison\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 546, __extension__ __PRETTY_FUNCTION__))
;
547
548 if (MI.getNumExplicitOperands() == 2 && MI.getOperand(0).isReg() &&
549 MI.getOperand(1).isImm()) {
550 SrcReg = MI.getOperand(0).getReg();
551 SrcReg2 = 0;
552 Value = MI.getOperand(1).getImm();
553 Mask = ~0;
554 return true;
555 }
556
557 return false;
558}
559
560// If Reg is a virtual register, return its definition, otherwise return null.
561static MachineInstr *getDef(unsigned Reg,
562 const MachineRegisterInfo *MRI) {
563 if (TargetRegisterInfo::isPhysicalRegister(Reg))
564 return nullptr;
565 return MRI->getUniqueVRegDef(Reg);
566}
567
568// Return true if MI is a shift of type Opcode by Imm bits.
569static bool isShift(MachineInstr *MI, unsigned Opcode, int64_t Imm) {
570 return (MI->getOpcode() == Opcode &&
571 !MI->getOperand(2).getReg() &&
572 MI->getOperand(3).getImm() == Imm);
573}
574
575// If the destination of MI has no uses, delete it as dead.
576static void eraseIfDead(MachineInstr *MI, const MachineRegisterInfo *MRI) {
577 if (MRI->use_nodbg_empty(MI->getOperand(0).getReg()))
578 MI->eraseFromParent();
579}
580
581// Compare compares SrcReg against zero. Check whether SrcReg contains
582// the result of an IPM sequence whose input CC survives until Compare,
583// and whether Compare is therefore redundant. Delete it and return
584// true if so.
585static bool removeIPMBasedCompare(MachineInstr &Compare, unsigned SrcReg,
586 const MachineRegisterInfo *MRI,
587 const TargetRegisterInfo *TRI) {
588 MachineInstr *LGFR = nullptr;
589 MachineInstr *RLL = getDef(SrcReg, MRI);
590 if (RLL && RLL->getOpcode() == SystemZ::LGFR) {
591 LGFR = RLL;
592 RLL = getDef(LGFR->getOperand(1).getReg(), MRI);
593 }
594 if (!RLL || !isShift(RLL, SystemZ::RLL, 31))
595 return false;
596
597 MachineInstr *SRL = getDef(RLL->getOperand(1).getReg(), MRI);
598 if (!SRL || !isShift(SRL, SystemZ::SRL, SystemZ::IPM_CC))
599 return false;
600
601 MachineInstr *IPM = getDef(SRL->getOperand(1).getReg(), MRI);
602 if (!IPM || IPM->getOpcode() != SystemZ::IPM)
603 return false;
604
605 // Check that there are no assignments to CC between the IPM and Compare,
606 if (IPM->getParent() != Compare.getParent())
607 return false;
608 MachineBasicBlock::iterator MBBI = IPM, MBBE = Compare.getIterator();
609 for (++MBBI; MBBI != MBBE; ++MBBI) {
610 MachineInstr &MI = *MBBI;
611 if (MI.modifiesRegister(SystemZ::CC, TRI))
612 return false;
613 }
614
615 Compare.eraseFromParent();
616 if (LGFR)
617 eraseIfDead(LGFR, MRI);
618 eraseIfDead(RLL, MRI);
619 eraseIfDead(SRL, MRI);
620 eraseIfDead(IPM, MRI);
621
622 return true;
623}
624
625bool SystemZInstrInfo::optimizeCompareInstr(
626 MachineInstr &Compare, unsigned SrcReg, unsigned SrcReg2, int Mask,
627 int Value, const MachineRegisterInfo *MRI) const {
628 assert(!SrcReg2 && "Only optimizing constant comparisons so far")(static_cast <bool> (!SrcReg2 && "Only optimizing constant comparisons so far"
) ? void (0) : __assert_fail ("!SrcReg2 && \"Only optimizing constant comparisons so far\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 628, __extension__ __PRETTY_FUNCTION__))
;
629 bool IsLogical = (Compare.getDesc().TSFlags & SystemZII::IsLogical) != 0;
630 return Value == 0 && !IsLogical &&
631 removeIPMBasedCompare(Compare, SrcReg, MRI, &RI);
632}
633
634bool SystemZInstrInfo::canInsertSelect(const MachineBasicBlock &MBB,
635 ArrayRef<MachineOperand> Pred,
636 unsigned TrueReg, unsigned FalseReg,
637 int &CondCycles, int &TrueCycles,
638 int &FalseCycles) const {
639 // Not all subtargets have LOCR instructions.
640 if (!STI.hasLoadStoreOnCond())
641 return false;
642 if (Pred.size() != 2)
643 return false;
644
645 // Check register classes.
646 const MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
647 const TargetRegisterClass *RC =
648 RI.getCommonSubClass(MRI.getRegClass(TrueReg), MRI.getRegClass(FalseReg));
649 if (!RC)
650 return false;
651
652 // We have LOCR instructions for 32 and 64 bit general purpose registers.
653 if ((STI.hasLoadStoreOnCond2() &&
654 SystemZ::GRX32BitRegClass.hasSubClassEq(RC)) ||
655 SystemZ::GR32BitRegClass.hasSubClassEq(RC) ||
656 SystemZ::GR64BitRegClass.hasSubClassEq(RC)) {
657 CondCycles = 2;
658 TrueCycles = 2;
659 FalseCycles = 2;
660 return true;
661 }
662
663 // Can't do anything else.
664 return false;
665}
666
667void SystemZInstrInfo::insertSelect(MachineBasicBlock &MBB,
668 MachineBasicBlock::iterator I,
669 const DebugLoc &DL, unsigned DstReg,
670 ArrayRef<MachineOperand> Pred,
671 unsigned TrueReg,
672 unsigned FalseReg) const {
673 MachineRegisterInfo &MRI = MBB.getParent()->getRegInfo();
674 const TargetRegisterClass *RC = MRI.getRegClass(DstReg);
675
676 assert(Pred.size() == 2 && "Invalid condition")(static_cast <bool> (Pred.size() == 2 && "Invalid condition"
) ? void (0) : __assert_fail ("Pred.size() == 2 && \"Invalid condition\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 676, __extension__ __PRETTY_FUNCTION__))
;
677 unsigned CCValid = Pred[0].getImm();
678 unsigned CCMask = Pred[1].getImm();
679
680 unsigned Opc;
681 if (SystemZ::GRX32BitRegClass.hasSubClassEq(RC)) {
682 if (STI.hasLoadStoreOnCond2())
683 Opc = SystemZ::LOCRMux;
684 else {
685 Opc = SystemZ::LOCR;
686 MRI.constrainRegClass(DstReg, &SystemZ::GR32BitRegClass);
687 unsigned TReg = MRI.createVirtualRegister(&SystemZ::GR32BitRegClass);
688 unsigned FReg = MRI.createVirtualRegister(&SystemZ::GR32BitRegClass);
689 BuildMI(MBB, I, DL, get(TargetOpcode::COPY), TReg).addReg(TrueReg);
690 BuildMI(MBB, I, DL, get(TargetOpcode::COPY), FReg).addReg(FalseReg);
691 TrueReg = TReg;
692 FalseReg = FReg;
693 }
694 } else if (SystemZ::GR64BitRegClass.hasSubClassEq(RC))
695 Opc = SystemZ::LOCGR;
696 else
697 llvm_unreachable("Invalid register class")::llvm::llvm_unreachable_internal("Invalid register class", "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 697)
;
698
699 BuildMI(MBB, I, DL, get(Opc), DstReg)
700 .addReg(FalseReg).addReg(TrueReg)
701 .addImm(CCValid).addImm(CCMask);
702}
703
704bool SystemZInstrInfo::FoldImmediate(MachineInstr &UseMI, MachineInstr &DefMI,
705 unsigned Reg,
706 MachineRegisterInfo *MRI) const {
707 unsigned DefOpc = DefMI.getOpcode();
708 if (DefOpc != SystemZ::LHIMux && DefOpc != SystemZ::LHI &&
709 DefOpc != SystemZ::LGHI)
710 return false;
711 if (DefMI.getOperand(0).getReg() != Reg)
712 return false;
713 int32_t ImmVal = (int32_t)DefMI.getOperand(1).getImm();
714
715 unsigned UseOpc = UseMI.getOpcode();
716 unsigned NewUseOpc;
717 unsigned UseIdx;
718 int CommuteIdx = -1;
719 switch (UseOpc) {
720 case SystemZ::LOCRMux:
721 if (!STI.hasLoadStoreOnCond2())
722 return false;
723 NewUseOpc = SystemZ::LOCHIMux;
724 if (UseMI.getOperand(2).getReg() == Reg)
725 UseIdx = 2;
726 else if (UseMI.getOperand(1).getReg() == Reg)
727 UseIdx = 2, CommuteIdx = 1;
728 else
729 return false;
730 break;
731 case SystemZ::LOCGR:
732 if (!STI.hasLoadStoreOnCond2())
733 return false;
734 NewUseOpc = SystemZ::LOCGHI;
735 if (UseMI.getOperand(2).getReg() == Reg)
736 UseIdx = 2;
737 else if (UseMI.getOperand(1).getReg() == Reg)
738 UseIdx = 2, CommuteIdx = 1;
739 else
740 return false;
741 break;
742 default:
743 return false;
744 }
745
746 if (CommuteIdx != -1)
747 if (!commuteInstruction(UseMI, false, CommuteIdx, UseIdx))
748 return false;
749
750 bool DeleteDef = MRI->hasOneNonDBGUse(Reg);
751 UseMI.setDesc(get(NewUseOpc));
752 UseMI.getOperand(UseIdx).ChangeToImmediate(ImmVal);
753 if (DeleteDef)
754 DefMI.eraseFromParent();
755
756 return true;
757}
758
759bool SystemZInstrInfo::isPredicable(const MachineInstr &MI) const {
760 unsigned Opcode = MI.getOpcode();
761 if (Opcode == SystemZ::Return ||
762 Opcode == SystemZ::Trap ||
763 Opcode == SystemZ::CallJG ||
764 Opcode == SystemZ::CallBR)
765 return true;
766 return false;
767}
768
769bool SystemZInstrInfo::
770isProfitableToIfCvt(MachineBasicBlock &MBB,
771 unsigned NumCycles, unsigned ExtraPredCycles,
772 BranchProbability Probability) const {
773 // Avoid using conditional returns at the end of a loop (since then
774 // we'd need to emit an unconditional branch to the beginning anyway,
775 // making the loop body longer). This doesn't apply for low-probability
776 // loops (eg. compare-and-swap retry), so just decide based on branch
777 // probability instead of looping structure.
778 // However, since Compare and Trap instructions cost the same as a regular
779 // Compare instruction, we should allow the if conversion to convert this
780 // into a Conditional Compare regardless of the branch probability.
781 if (MBB.getLastNonDebugInstr()->getOpcode() != SystemZ::Trap &&
782 MBB.succ_empty() && Probability < BranchProbability(1, 8))
783 return false;
784 // For now only convert single instructions.
785 return NumCycles == 1;
786}
787
788bool SystemZInstrInfo::
789isProfitableToIfCvt(MachineBasicBlock &TMBB,
790 unsigned NumCyclesT, unsigned ExtraPredCyclesT,
791 MachineBasicBlock &FMBB,
792 unsigned NumCyclesF, unsigned ExtraPredCyclesF,
793 BranchProbability Probability) const {
794 // For now avoid converting mutually-exclusive cases.
795 return false;
796}
797
798bool SystemZInstrInfo::
799isProfitableToDupForIfCvt(MachineBasicBlock &MBB, unsigned NumCycles,
800 BranchProbability Probability) const {
801 // For now only duplicate single instructions.
802 return NumCycles == 1;
803}
804
805bool SystemZInstrInfo::PredicateInstruction(
806 MachineInstr &MI, ArrayRef<MachineOperand> Pred) const {
807 assert(Pred.size() == 2 && "Invalid condition")(static_cast <bool> (Pred.size() == 2 && "Invalid condition"
) ? void (0) : __assert_fail ("Pred.size() == 2 && \"Invalid condition\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 807, __extension__ __PRETTY_FUNCTION__))
;
808 unsigned CCValid = Pred[0].getImm();
809 unsigned CCMask = Pred[1].getImm();
810 assert(CCMask > 0 && CCMask < 15 && "Invalid predicate")(static_cast <bool> (CCMask > 0 && CCMask <
15 && "Invalid predicate") ? void (0) : __assert_fail
("CCMask > 0 && CCMask < 15 && \"Invalid predicate\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 810, __extension__ __PRETTY_FUNCTION__))
;
811 unsigned Opcode = MI.getOpcode();
812 if (Opcode == SystemZ::Trap) {
813 MI.setDesc(get(SystemZ::CondTrap));
814 MachineInstrBuilder(*MI.getParent()->getParent(), MI)
815 .addImm(CCValid).addImm(CCMask)
816 .addReg(SystemZ::CC, RegState::Implicit);
817 return true;
818 }
819 if (Opcode == SystemZ::Return) {
820 MI.setDesc(get(SystemZ::CondReturn));
821 MachineInstrBuilder(*MI.getParent()->getParent(), MI)
822 .addImm(CCValid).addImm(CCMask)
823 .addReg(SystemZ::CC, RegState::Implicit);
824 return true;
825 }
826 if (Opcode == SystemZ::CallJG) {
827 MachineOperand FirstOp = MI.getOperand(0);
828 const uint32_t *RegMask = MI.getOperand(1).getRegMask();
829 MI.RemoveOperand(1);
830 MI.RemoveOperand(0);
831 MI.setDesc(get(SystemZ::CallBRCL));
832 MachineInstrBuilder(*MI.getParent()->getParent(), MI)
833 .addImm(CCValid)
834 .addImm(CCMask)
835 .add(FirstOp)
836 .addRegMask(RegMask)
837 .addReg(SystemZ::CC, RegState::Implicit);
838 return true;
839 }
840 if (Opcode == SystemZ::CallBR) {
841 const uint32_t *RegMask = MI.getOperand(0).getRegMask();
842 MI.RemoveOperand(0);
843 MI.setDesc(get(SystemZ::CallBCR));
844 MachineInstrBuilder(*MI.getParent()->getParent(), MI)
845 .addImm(CCValid).addImm(CCMask)
846 .addRegMask(RegMask)
847 .addReg(SystemZ::CC, RegState::Implicit);
848 return true;
849 }
850 return false;
851}
852
853void SystemZInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
854 MachineBasicBlock::iterator MBBI,
855 const DebugLoc &DL, unsigned DestReg,
856 unsigned SrcReg, bool KillSrc) const {
857 // Split 128-bit GPR moves into two 64-bit moves. Add implicit uses of the
858 // super register in case one of the subregs is undefined.
859 // This handles ADDR128 too.
860 if (SystemZ::GR128BitRegClass.contains(DestReg, SrcReg)) {
861 copyPhysReg(MBB, MBBI, DL, RI.getSubReg(DestReg, SystemZ::subreg_h64),
862 RI.getSubReg(SrcReg, SystemZ::subreg_h64), KillSrc);
863 MachineInstrBuilder(*MBB.getParent(), std::prev(MBBI))
864 .addReg(SrcReg, RegState::Implicit);
865 copyPhysReg(MBB, MBBI, DL, RI.getSubReg(DestReg, SystemZ::subreg_l64),
866 RI.getSubReg(SrcReg, SystemZ::subreg_l64), KillSrc);
867 MachineInstrBuilder(*MBB.getParent(), std::prev(MBBI))
868 .addReg(SrcReg, (getKillRegState(KillSrc) | RegState::Implicit));
869 return;
870 }
871
872 if (SystemZ::GRX32BitRegClass.contains(DestReg, SrcReg)) {
873 emitGRX32Move(MBB, MBBI, DL, DestReg, SrcReg, SystemZ::LR, 32, KillSrc,
874 false);
875 return;
876 }
877
878 // Move 128-bit floating-point values between VR128 and FP128.
879 if (SystemZ::VR128BitRegClass.contains(DestReg) &&
880 SystemZ::FP128BitRegClass.contains(SrcReg)) {
881 unsigned SrcRegHi =
882 RI.getMatchingSuperReg(RI.getSubReg(SrcReg, SystemZ::subreg_h64),
883 SystemZ::subreg_r64, &SystemZ::VR128BitRegClass);
884 unsigned SrcRegLo =
885 RI.getMatchingSuperReg(RI.getSubReg(SrcReg, SystemZ::subreg_l64),
886 SystemZ::subreg_r64, &SystemZ::VR128BitRegClass);
887
888 BuildMI(MBB, MBBI, DL, get(SystemZ::VMRHG), DestReg)
889 .addReg(SrcRegHi, getKillRegState(KillSrc))
890 .addReg(SrcRegLo, getKillRegState(KillSrc));
891 return;
892 }
893 if (SystemZ::FP128BitRegClass.contains(DestReg) &&
894 SystemZ::VR128BitRegClass.contains(SrcReg)) {
895 unsigned DestRegHi =
896 RI.getMatchingSuperReg(RI.getSubReg(DestReg, SystemZ::subreg_h64),
897 SystemZ::subreg_r64, &SystemZ::VR128BitRegClass);
898 unsigned DestRegLo =
899 RI.getMatchingSuperReg(RI.getSubReg(DestReg, SystemZ::subreg_l64),
900 SystemZ::subreg_r64, &SystemZ::VR128BitRegClass);
901
902 if (DestRegHi != SrcReg)
903 copyPhysReg(MBB, MBBI, DL, DestRegHi, SrcReg, false);
904 BuildMI(MBB, MBBI, DL, get(SystemZ::VREPG), DestRegLo)
905 .addReg(SrcReg, getKillRegState(KillSrc)).addImm(1);
906 return;
907 }
908
909 // Everything else needs only one instruction.
910 unsigned Opcode;
911 if (SystemZ::GR64BitRegClass.contains(DestReg, SrcReg))
912 Opcode = SystemZ::LGR;
913 else if (SystemZ::FP32BitRegClass.contains(DestReg, SrcReg))
914 // For z13 we prefer LDR over LER to avoid partial register dependencies.
915 Opcode = STI.hasVector() ? SystemZ::LDR32 : SystemZ::LER;
916 else if (SystemZ::FP64BitRegClass.contains(DestReg, SrcReg))
917 Opcode = SystemZ::LDR;
918 else if (SystemZ::FP128BitRegClass.contains(DestReg, SrcReg))
919 Opcode = SystemZ::LXR;
920 else if (SystemZ::VR32BitRegClass.contains(DestReg, SrcReg))
921 Opcode = SystemZ::VLR32;
922 else if (SystemZ::VR64BitRegClass.contains(DestReg, SrcReg))
923 Opcode = SystemZ::VLR64;
924 else if (SystemZ::VR128BitRegClass.contains(DestReg, SrcReg))
925 Opcode = SystemZ::VLR;
926 else if (SystemZ::AR32BitRegClass.contains(DestReg, SrcReg))
927 Opcode = SystemZ::CPYA;
928 else if (SystemZ::AR32BitRegClass.contains(DestReg) &&
929 SystemZ::GR32BitRegClass.contains(SrcReg))
930 Opcode = SystemZ::SAR;
931 else if (SystemZ::GR32BitRegClass.contains(DestReg) &&
932 SystemZ::AR32BitRegClass.contains(SrcReg))
933 Opcode = SystemZ::EAR;
934 else
935 llvm_unreachable("Impossible reg-to-reg copy")::llvm::llvm_unreachable_internal("Impossible reg-to-reg copy"
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 935)
;
936
937 BuildMI(MBB, MBBI, DL, get(Opcode), DestReg)
938 .addReg(SrcReg, getKillRegState(KillSrc));
939}
940
941void SystemZInstrInfo::storeRegToStackSlot(
942 MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, unsigned SrcReg,
943 bool isKill, int FrameIdx, const TargetRegisterClass *RC,
944 const TargetRegisterInfo *TRI) const {
945 DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
946
947 // Callers may expect a single instruction, so keep 128-bit moves
948 // together for now and lower them after register allocation.
949 unsigned LoadOpcode, StoreOpcode;
950 getLoadStoreOpcodes(RC, LoadOpcode, StoreOpcode);
951 addFrameReference(BuildMI(MBB, MBBI, DL, get(StoreOpcode))
952 .addReg(SrcReg, getKillRegState(isKill)),
953 FrameIdx);
954}
955
956void SystemZInstrInfo::loadRegFromStackSlot(
957 MachineBasicBlock &MBB, MachineBasicBlock::iterator MBBI, unsigned DestReg,
958 int FrameIdx, const TargetRegisterClass *RC,
959 const TargetRegisterInfo *TRI) const {
960 DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
961
962 // Callers may expect a single instruction, so keep 128-bit moves
963 // together for now and lower them after register allocation.
964 unsigned LoadOpcode, StoreOpcode;
965 getLoadStoreOpcodes(RC, LoadOpcode, StoreOpcode);
966 addFrameReference(BuildMI(MBB, MBBI, DL, get(LoadOpcode), DestReg),
967 FrameIdx);
968}
969
970// Return true if MI is a simple load or store with a 12-bit displacement
971// and no index. Flag is SimpleBDXLoad for loads and SimpleBDXStore for stores.
972static bool isSimpleBD12Move(const MachineInstr *MI, unsigned Flag) {
973 const MCInstrDesc &MCID = MI->getDesc();
974 return ((MCID.TSFlags & Flag) &&
975 isUInt<12>(MI->getOperand(2).getImm()) &&
976 MI->getOperand(3).getReg() == 0);
977}
978
979namespace {
980
981struct LogicOp {
982 LogicOp() = default;
983 LogicOp(unsigned regSize, unsigned immLSB, unsigned immSize)
984 : RegSize(regSize), ImmLSB(immLSB), ImmSize(immSize) {}
985
986 explicit operator bool() const { return RegSize; }
987
988 unsigned RegSize = 0;
989 unsigned ImmLSB = 0;
990 unsigned ImmSize = 0;
991};
992
993} // end anonymous namespace
994
995static LogicOp interpretAndImmediate(unsigned Opcode) {
996 switch (Opcode) {
997 case SystemZ::NILMux: return LogicOp(32, 0, 16);
998 case SystemZ::NIHMux: return LogicOp(32, 16, 16);
999 case SystemZ::NILL64: return LogicOp(64, 0, 16);
1000 case SystemZ::NILH64: return LogicOp(64, 16, 16);
1001 case SystemZ::NIHL64: return LogicOp(64, 32, 16);
1002 case SystemZ::NIHH64: return LogicOp(64, 48, 16);
1003 case SystemZ::NIFMux: return LogicOp(32, 0, 32);
1004 case SystemZ::NILF64: return LogicOp(64, 0, 32);
1005 case SystemZ::NIHF64: return LogicOp(64, 32, 32);
1006 default: return LogicOp();
1007 }
1008}
1009
1010static void transferDeadCC(MachineInstr *OldMI, MachineInstr *NewMI) {
1011 if (OldMI->registerDefIsDead(SystemZ::CC)) {
1012 MachineOperand *CCDef = NewMI->findRegisterDefOperand(SystemZ::CC);
1013 if (CCDef != nullptr)
1014 CCDef->setIsDead(true);
1015 }
1016}
1017
1018// Used to return from convertToThreeAddress after replacing two-address
1019// instruction OldMI with three-address instruction NewMI.
1020static MachineInstr *finishConvertToThreeAddress(MachineInstr *OldMI,
1021 MachineInstr *NewMI,
1022 LiveVariables *LV) {
1023 if (LV) {
1024 unsigned NumOps = OldMI->getNumOperands();
1025 for (unsigned I = 1; I < NumOps; ++I) {
1026 MachineOperand &Op = OldMI->getOperand(I);
1027 if (Op.isReg() && Op.isKill())
1028 LV->replaceKillInstruction(Op.getReg(), *OldMI, *NewMI);
1029 }
1030 }
1031 transferDeadCC(OldMI, NewMI);
1032 return NewMI;
1033}
1034
1035MachineInstr *SystemZInstrInfo::convertToThreeAddress(
1036 MachineFunction::iterator &MFI, MachineInstr &MI, LiveVariables *LV) const {
1037 MachineBasicBlock *MBB = MI.getParent();
1038 MachineFunction *MF = MBB->getParent();
1039 MachineRegisterInfo &MRI = MF->getRegInfo();
1040
1041 unsigned Opcode = MI.getOpcode();
1042 unsigned NumOps = MI.getNumOperands();
1043
1044 // Try to convert something like SLL into SLLK, if supported.
1045 // We prefer to keep the two-operand form where possible both
1046 // because it tends to be shorter and because some instructions
1047 // have memory forms that can be used during spilling.
1048 if (STI.hasDistinctOps()) {
1
Assuming the condition is false
2
Taking false branch
1049 MachineOperand &Dest = MI.getOperand(0);
1050 MachineOperand &Src = MI.getOperand(1);
1051 unsigned DestReg = Dest.getReg();
1052 unsigned SrcReg = Src.getReg();
1053 // AHIMux is only really a three-operand instruction when both operands
1054 // are low registers. Try to constrain both operands to be low if
1055 // possible.
1056 if (Opcode == SystemZ::AHIMux &&
1057 TargetRegisterInfo::isVirtualRegister(DestReg) &&
1058 TargetRegisterInfo::isVirtualRegister(SrcReg) &&
1059 MRI.getRegClass(DestReg)->contains(SystemZ::R1L) &&
1060 MRI.getRegClass(SrcReg)->contains(SystemZ::R1L)) {
1061 MRI.constrainRegClass(DestReg, &SystemZ::GR32BitRegClass);
1062 MRI.constrainRegClass(SrcReg, &SystemZ::GR32BitRegClass);
1063 }
1064 int ThreeOperandOpcode = SystemZ::getThreeOperandOpcode(Opcode);
1065 if (ThreeOperandOpcode >= 0) {
1066 // Create three address instruction without adding the implicit
1067 // operands. Those will instead be copied over from the original
1068 // instruction by the loop below.
1069 MachineInstrBuilder MIB(
1070 *MF, MF->CreateMachineInstr(get(ThreeOperandOpcode), MI.getDebugLoc(),
1071 /*NoImplicit=*/true));
1072 MIB.add(Dest);
1073 // Keep the kill state, but drop the tied flag.
1074 MIB.addReg(Src.getReg(), getKillRegState(Src.isKill()), Src.getSubReg());
1075 // Keep the remaining operands as-is.
1076 for (unsigned I = 2; I < NumOps; ++I)
1077 MIB.add(MI.getOperand(I));
1078 MBB->insert(MI, MIB);
1079 return finishConvertToThreeAddress(&MI, MIB, LV);
1080 }
1081 }
1082
1083 // Try to convert an AND into an RISBG-type instruction.
1084 if (LogicOp And = interpretAndImmediate(Opcode)) {
3
Taking true branch
1085 uint64_t Imm = MI.getOperand(2).getImm() << And.ImmLSB;
1086 // AND IMMEDIATE leaves the other bits of the register unchanged.
1087 Imm |= allOnes(And.RegSize) & ~(allOnes(And.ImmSize) << And.ImmLSB);
1088 unsigned Start, End;
1089 if (isRxSBGMask(Imm, And.RegSize, Start, End)) {
4
Calling 'SystemZInstrInfo::isRxSBGMask'
1090 unsigned NewOpcode;
1091 if (And.RegSize == 64) {
1092 NewOpcode = SystemZ::RISBG;
1093 // Prefer RISBGN if available, since it does not clobber CC.
1094 if (STI.hasMiscellaneousExtensions())
1095 NewOpcode = SystemZ::RISBGN;
1096 } else {
1097 NewOpcode = SystemZ::RISBMux;
1098 Start &= 31;
1099 End &= 31;
1100 }
1101 MachineOperand &Dest = MI.getOperand(0);
1102 MachineOperand &Src = MI.getOperand(1);
1103 MachineInstrBuilder MIB =
1104 BuildMI(*MBB, MI, MI.getDebugLoc(), get(NewOpcode))
1105 .add(Dest)
1106 .addReg(0)
1107 .addReg(Src.getReg(), getKillRegState(Src.isKill()),
1108 Src.getSubReg())
1109 .addImm(Start)
1110 .addImm(End + 128)
1111 .addImm(0);
1112 return finishConvertToThreeAddress(&MI, MIB, LV);
1113 }
1114 }
1115 return nullptr;
1116}
1117
1118MachineInstr *SystemZInstrInfo::foldMemoryOperandImpl(
1119 MachineFunction &MF, MachineInstr &MI, ArrayRef<unsigned> Ops,
1120 MachineBasicBlock::iterator InsertPt, int FrameIndex,
1121 LiveIntervals *LIS) const {
1122 const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
1123 const MachineFrameInfo &MFI = MF.getFrameInfo();
1124 unsigned Size = MFI.getObjectSize(FrameIndex);
1125 unsigned Opcode = MI.getOpcode();
1126
1127 if (Ops.size() == 2 && Ops[0] == 0 && Ops[1] == 1) {
1128 if (LIS != nullptr && (Opcode == SystemZ::LA || Opcode == SystemZ::LAY) &&
1129 isInt<8>(MI.getOperand(2).getImm()) && !MI.getOperand(3).getReg()) {
1130
1131 // Check CC liveness, since new instruction introduces a dead
1132 // def of CC.
1133 MCRegUnitIterator CCUnit(SystemZ::CC, TRI);
1134 LiveRange &CCLiveRange = LIS->getRegUnit(*CCUnit);
1135 ++CCUnit;
1136 assert(!CCUnit.isValid() && "CC only has one reg unit.")(static_cast <bool> (!CCUnit.isValid() && "CC only has one reg unit."
) ? void (0) : __assert_fail ("!CCUnit.isValid() && \"CC only has one reg unit.\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1136, __extension__ __PRETTY_FUNCTION__))
;
1137 SlotIndex MISlot =
1138 LIS->getSlotIndexes()->getInstructionIndex(MI).getRegSlot();
1139 if (!CCLiveRange.liveAt(MISlot)) {
1140 // LA(Y) %reg, CONST(%reg) -> AGSI %mem, CONST
1141 MachineInstr *BuiltMI = BuildMI(*InsertPt->getParent(), InsertPt,
1142 MI.getDebugLoc(), get(SystemZ::AGSI))
1143 .addFrameIndex(FrameIndex)
1144 .addImm(0)
1145 .addImm(MI.getOperand(2).getImm());
1146 BuiltMI->findRegisterDefOperand(SystemZ::CC)->setIsDead(true);
1147 CCLiveRange.createDeadDef(MISlot, LIS->getVNInfoAllocator());
1148 return BuiltMI;
1149 }
1150 }
1151 return nullptr;
1152 }
1153
1154 // All other cases require a single operand.
1155 if (Ops.size() != 1)
1156 return nullptr;
1157
1158 unsigned OpNum = Ops[0];
1159 assert(Size * 8 ==(static_cast <bool> (Size * 8 == TRI->getRegSizeInBits
(*MF.getRegInfo() .getRegClass(MI.getOperand(OpNum).getReg())
) && "Invalid size combination") ? void (0) : __assert_fail
("Size * 8 == TRI->getRegSizeInBits(*MF.getRegInfo() .getRegClass(MI.getOperand(OpNum).getReg())) && \"Invalid size combination\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1162, __extension__ __PRETTY_FUNCTION__))
1160 TRI->getRegSizeInBits(*MF.getRegInfo()(static_cast <bool> (Size * 8 == TRI->getRegSizeInBits
(*MF.getRegInfo() .getRegClass(MI.getOperand(OpNum).getReg())
) && "Invalid size combination") ? void (0) : __assert_fail
("Size * 8 == TRI->getRegSizeInBits(*MF.getRegInfo() .getRegClass(MI.getOperand(OpNum).getReg())) && \"Invalid size combination\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1162, __extension__ __PRETTY_FUNCTION__))
1161 .getRegClass(MI.getOperand(OpNum).getReg())) &&(static_cast <bool> (Size * 8 == TRI->getRegSizeInBits
(*MF.getRegInfo() .getRegClass(MI.getOperand(OpNum).getReg())
) && "Invalid size combination") ? void (0) : __assert_fail
("Size * 8 == TRI->getRegSizeInBits(*MF.getRegInfo() .getRegClass(MI.getOperand(OpNum).getReg())) && \"Invalid size combination\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1162, __extension__ __PRETTY_FUNCTION__))
1162 "Invalid size combination")(static_cast <bool> (Size * 8 == TRI->getRegSizeInBits
(*MF.getRegInfo() .getRegClass(MI.getOperand(OpNum).getReg())
) && "Invalid size combination") ? void (0) : __assert_fail
("Size * 8 == TRI->getRegSizeInBits(*MF.getRegInfo() .getRegClass(MI.getOperand(OpNum).getReg())) && \"Invalid size combination\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1162, __extension__ __PRETTY_FUNCTION__))
;
1163
1164 if ((Opcode == SystemZ::AHI || Opcode == SystemZ::AGHI) && OpNum == 0 &&
1165 isInt<8>(MI.getOperand(2).getImm())) {
1166 // A(G)HI %reg, CONST -> A(G)SI %mem, CONST
1167 Opcode = (Opcode == SystemZ::AHI ? SystemZ::ASI : SystemZ::AGSI);
1168 MachineInstr *BuiltMI =
1169 BuildMI(*InsertPt->getParent(), InsertPt, MI.getDebugLoc(), get(Opcode))
1170 .addFrameIndex(FrameIndex)
1171 .addImm(0)
1172 .addImm(MI.getOperand(2).getImm());
1173 transferDeadCC(&MI, BuiltMI);
1174 return BuiltMI;
1175 }
1176
1177 if (Opcode == SystemZ::LGDR || Opcode == SystemZ::LDGR) {
1178 bool Op0IsGPR = (Opcode == SystemZ::LGDR);
1179 bool Op1IsGPR = (Opcode == SystemZ::LDGR);
1180 // If we're spilling the destination of an LDGR or LGDR, store the
1181 // source register instead.
1182 if (OpNum == 0) {
1183 unsigned StoreOpcode = Op1IsGPR ? SystemZ::STG : SystemZ::STD;
1184 return BuildMI(*InsertPt->getParent(), InsertPt, MI.getDebugLoc(),
1185 get(StoreOpcode))
1186 .add(MI.getOperand(1))
1187 .addFrameIndex(FrameIndex)
1188 .addImm(0)
1189 .addReg(0);
1190 }
1191 // If we're spilling the source of an LDGR or LGDR, load the
1192 // destination register instead.
1193 if (OpNum == 1) {
1194 unsigned LoadOpcode = Op0IsGPR ? SystemZ::LG : SystemZ::LD;
1195 return BuildMI(*InsertPt->getParent(), InsertPt, MI.getDebugLoc(),
1196 get(LoadOpcode))
1197 .add(MI.getOperand(0))
1198 .addFrameIndex(FrameIndex)
1199 .addImm(0)
1200 .addReg(0);
1201 }
1202 }
1203
1204 // Look for cases where the source of a simple store or the destination
1205 // of a simple load is being spilled. Try to use MVC instead.
1206 //
1207 // Although MVC is in practice a fast choice in these cases, it is still
1208 // logically a bytewise copy. This means that we cannot use it if the
1209 // load or store is volatile. We also wouldn't be able to use MVC if
1210 // the two memories partially overlap, but that case cannot occur here,
1211 // because we know that one of the memories is a full frame index.
1212 //
1213 // For performance reasons, we also want to avoid using MVC if the addresses
1214 // might be equal. We don't worry about that case here, because spill slot
1215 // coloring happens later, and because we have special code to remove
1216 // MVCs that turn out to be redundant.
1217 if (OpNum == 0 && MI.hasOneMemOperand()) {
1218 MachineMemOperand *MMO = *MI.memoperands_begin();
1219 if (MMO->getSize() == Size && !MMO->isVolatile()) {
1220 // Handle conversion of loads.
1221 if (isSimpleBD12Move(&MI, SystemZII::SimpleBDXLoad)) {
1222 return BuildMI(*InsertPt->getParent(), InsertPt, MI.getDebugLoc(),
1223 get(SystemZ::MVC))
1224 .addFrameIndex(FrameIndex)
1225 .addImm(0)
1226 .addImm(Size)
1227 .add(MI.getOperand(1))
1228 .addImm(MI.getOperand(2).getImm())
1229 .addMemOperand(MMO);
1230 }
1231 // Handle conversion of stores.
1232 if (isSimpleBD12Move(&MI, SystemZII::SimpleBDXStore)) {
1233 return BuildMI(*InsertPt->getParent(), InsertPt, MI.getDebugLoc(),
1234 get(SystemZ::MVC))
1235 .add(MI.getOperand(1))
1236 .addImm(MI.getOperand(2).getImm())
1237 .addImm(Size)
1238 .addFrameIndex(FrameIndex)
1239 .addImm(0)
1240 .addMemOperand(MMO);
1241 }
1242 }
1243 }
1244
1245 // If the spilled operand is the final one, try to change <INSN>R
1246 // into <INSN>.
1247 int MemOpcode = SystemZ::getMemOpcode(Opcode);
1248 if (MemOpcode >= 0) {
1249 unsigned NumOps = MI.getNumExplicitOperands();
1250 if (OpNum == NumOps - 1) {
1251 const MCInstrDesc &MemDesc = get(MemOpcode);
1252 uint64_t AccessBytes = SystemZII::getAccessSize(MemDesc.TSFlags);
1253 assert(AccessBytes != 0 && "Size of access should be known")(static_cast <bool> (AccessBytes != 0 && "Size of access should be known"
) ? void (0) : __assert_fail ("AccessBytes != 0 && \"Size of access should be known\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1253, __extension__ __PRETTY_FUNCTION__))
;
1254 assert(AccessBytes <= Size && "Access outside the frame index")(static_cast <bool> (AccessBytes <= Size && "Access outside the frame index"
) ? void (0) : __assert_fail ("AccessBytes <= Size && \"Access outside the frame index\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1254, __extension__ __PRETTY_FUNCTION__))
;
1255 uint64_t Offset = Size - AccessBytes;
1256 MachineInstrBuilder MIB = BuildMI(*InsertPt->getParent(), InsertPt,
1257 MI.getDebugLoc(), get(MemOpcode));
1258 for (unsigned I = 0; I < OpNum; ++I)
1259 MIB.add(MI.getOperand(I));
1260 MIB.addFrameIndex(FrameIndex).addImm(Offset);
1261 if (MemDesc.TSFlags & SystemZII::HasIndex)
1262 MIB.addReg(0);
1263 transferDeadCC(&MI, MIB);
1264 return MIB;
1265 }
1266 }
1267
1268 return nullptr;
1269}
1270
1271MachineInstr *SystemZInstrInfo::foldMemoryOperandImpl(
1272 MachineFunction &MF, MachineInstr &MI, ArrayRef<unsigned> Ops,
1273 MachineBasicBlock::iterator InsertPt, MachineInstr &LoadMI,
1274 LiveIntervals *LIS) const {
1275 return nullptr;
1276}
1277
1278bool SystemZInstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
1279 switch (MI.getOpcode()) {
1280 case SystemZ::L128:
1281 splitMove(MI, SystemZ::LG);
1282 return true;
1283
1284 case SystemZ::ST128:
1285 splitMove(MI, SystemZ::STG);
1286 return true;
1287
1288 case SystemZ::LX:
1289 splitMove(MI, SystemZ::LD);
1290 return true;
1291
1292 case SystemZ::STX:
1293 splitMove(MI, SystemZ::STD);
1294 return true;
1295
1296 case SystemZ::LBMux:
1297 expandRXYPseudo(MI, SystemZ::LB, SystemZ::LBH);
1298 return true;
1299
1300 case SystemZ::LHMux:
1301 expandRXYPseudo(MI, SystemZ::LH, SystemZ::LHH);
1302 return true;
1303
1304 case SystemZ::LLCRMux:
1305 expandZExtPseudo(MI, SystemZ::LLCR, 8);
1306 return true;
1307
1308 case SystemZ::LLHRMux:
1309 expandZExtPseudo(MI, SystemZ::LLHR, 16);
1310 return true;
1311
1312 case SystemZ::LLCMux:
1313 expandRXYPseudo(MI, SystemZ::LLC, SystemZ::LLCH);
1314 return true;
1315
1316 case SystemZ::LLHMux:
1317 expandRXYPseudo(MI, SystemZ::LLH, SystemZ::LLHH);
1318 return true;
1319
1320 case SystemZ::LMux:
1321 expandRXYPseudo(MI, SystemZ::L, SystemZ::LFH);
1322 return true;
1323
1324 case SystemZ::LOCMux:
1325 expandLOCPseudo(MI, SystemZ::LOC, SystemZ::LOCFH);
1326 return true;
1327
1328 case SystemZ::LOCHIMux:
1329 expandLOCPseudo(MI, SystemZ::LOCHI, SystemZ::LOCHHI);
1330 return true;
1331
1332 case SystemZ::LOCRMux:
1333 expandLOCRPseudo(MI, SystemZ::LOCR, SystemZ::LOCFHR);
1334 return true;
1335
1336 case SystemZ::STCMux:
1337 expandRXYPseudo(MI, SystemZ::STC, SystemZ::STCH);
1338 return true;
1339
1340 case SystemZ::STHMux:
1341 expandRXYPseudo(MI, SystemZ::STH, SystemZ::STHH);
1342 return true;
1343
1344 case SystemZ::STMux:
1345 expandRXYPseudo(MI, SystemZ::ST, SystemZ::STFH);
1346 return true;
1347
1348 case SystemZ::STOCMux:
1349 expandLOCPseudo(MI, SystemZ::STOC, SystemZ::STOCFH);
1350 return true;
1351
1352 case SystemZ::LHIMux:
1353 expandRIPseudo(MI, SystemZ::LHI, SystemZ::IIHF, true);
1354 return true;
1355
1356 case SystemZ::IIFMux:
1357 expandRIPseudo(MI, SystemZ::IILF, SystemZ::IIHF, false);
1358 return true;
1359
1360 case SystemZ::IILMux:
1361 expandRIPseudo(MI, SystemZ::IILL, SystemZ::IIHL, false);
1362 return true;
1363
1364 case SystemZ::IIHMux:
1365 expandRIPseudo(MI, SystemZ::IILH, SystemZ::IIHH, false);
1366 return true;
1367
1368 case SystemZ::NIFMux:
1369 expandRIPseudo(MI, SystemZ::NILF, SystemZ::NIHF, false);
1370 return true;
1371
1372 case SystemZ::NILMux:
1373 expandRIPseudo(MI, SystemZ::NILL, SystemZ::NIHL, false);
1374 return true;
1375
1376 case SystemZ::NIHMux:
1377 expandRIPseudo(MI, SystemZ::NILH, SystemZ::NIHH, false);
1378 return true;
1379
1380 case SystemZ::OIFMux:
1381 expandRIPseudo(MI, SystemZ::OILF, SystemZ::OIHF, false);
1382 return true;
1383
1384 case SystemZ::OILMux:
1385 expandRIPseudo(MI, SystemZ::OILL, SystemZ::OIHL, false);
1386 return true;
1387
1388 case SystemZ::OIHMux:
1389 expandRIPseudo(MI, SystemZ::OILH, SystemZ::OIHH, false);
1390 return true;
1391
1392 case SystemZ::XIFMux:
1393 expandRIPseudo(MI, SystemZ::XILF, SystemZ::XIHF, false);
1394 return true;
1395
1396 case SystemZ::TMLMux:
1397 expandRIPseudo(MI, SystemZ::TMLL, SystemZ::TMHL, false);
1398 return true;
1399
1400 case SystemZ::TMHMux:
1401 expandRIPseudo(MI, SystemZ::TMLH, SystemZ::TMHH, false);
1402 return true;
1403
1404 case SystemZ::AHIMux:
1405 expandRIPseudo(MI, SystemZ::AHI, SystemZ::AIH, false);
1406 return true;
1407
1408 case SystemZ::AHIMuxK:
1409 expandRIEPseudo(MI, SystemZ::AHI, SystemZ::AHIK, SystemZ::AIH);
1410 return true;
1411
1412 case SystemZ::AFIMux:
1413 expandRIPseudo(MI, SystemZ::AFI, SystemZ::AIH, false);
1414 return true;
1415
1416 case SystemZ::CHIMux:
1417 expandRIPseudo(MI, SystemZ::CHI, SystemZ::CIH, false);
1418 return true;
1419
1420 case SystemZ::CFIMux:
1421 expandRIPseudo(MI, SystemZ::CFI, SystemZ::CIH, false);
1422 return true;
1423
1424 case SystemZ::CLFIMux:
1425 expandRIPseudo(MI, SystemZ::CLFI, SystemZ::CLIH, false);
1426 return true;
1427
1428 case SystemZ::CMux:
1429 expandRXYPseudo(MI, SystemZ::C, SystemZ::CHF);
1430 return true;
1431
1432 case SystemZ::CLMux:
1433 expandRXYPseudo(MI, SystemZ::CL, SystemZ::CLHF);
1434 return true;
1435
1436 case SystemZ::RISBMux: {
1437 bool DestIsHigh = isHighReg(MI.getOperand(0).getReg());
1438 bool SrcIsHigh = isHighReg(MI.getOperand(2).getReg());
1439 if (SrcIsHigh == DestIsHigh)
1440 MI.setDesc(get(DestIsHigh ? SystemZ::RISBHH : SystemZ::RISBLL));
1441 else {
1442 MI.setDesc(get(DestIsHigh ? SystemZ::RISBHL : SystemZ::RISBLH));
1443 MI.getOperand(5).setImm(MI.getOperand(5).getImm() ^ 32);
1444 }
1445 return true;
1446 }
1447
1448 case SystemZ::ADJDYNALLOC:
1449 splitAdjDynAlloc(MI);
1450 return true;
1451
1452 case TargetOpcode::LOAD_STACK_GUARD:
1453 expandLoadStackGuard(&MI);
1454 return true;
1455
1456 default:
1457 return false;
1458 }
1459}
1460
1461unsigned SystemZInstrInfo::getInstSizeInBytes(const MachineInstr &MI) const {
1462 if (MI.getOpcode() == TargetOpcode::INLINEASM) {
1463 const MachineFunction *MF = MI.getParent()->getParent();
1464 const char *AsmStr = MI.getOperand(0).getSymbolName();
1465 return getInlineAsmLength(AsmStr, *MF->getTarget().getMCAsmInfo());
1466 }
1467 return MI.getDesc().getSize();
1468}
1469
1470SystemZII::Branch
1471SystemZInstrInfo::getBranchInfo(const MachineInstr &MI) const {
1472 switch (MI.getOpcode()) {
1473 case SystemZ::BR:
1474 case SystemZ::BI:
1475 case SystemZ::J:
1476 case SystemZ::JG:
1477 return SystemZII::Branch(SystemZII::BranchNormal, SystemZ::CCMASK_ANY,
1478 SystemZ::CCMASK_ANY, &MI.getOperand(0));
1479
1480 case SystemZ::BRC:
1481 case SystemZ::BRCL:
1482 return SystemZII::Branch(SystemZII::BranchNormal, MI.getOperand(0).getImm(),
1483 MI.getOperand(1).getImm(), &MI.getOperand(2));
1484
1485 case SystemZ::BRCT:
1486 case SystemZ::BRCTH:
1487 return SystemZII::Branch(SystemZII::BranchCT, SystemZ::CCMASK_ICMP,
1488 SystemZ::CCMASK_CMP_NE, &MI.getOperand(2));
1489
1490 case SystemZ::BRCTG:
1491 return SystemZII::Branch(SystemZII::BranchCTG, SystemZ::CCMASK_ICMP,
1492 SystemZ::CCMASK_CMP_NE, &MI.getOperand(2));
1493
1494 case SystemZ::CIJ:
1495 case SystemZ::CRJ:
1496 return SystemZII::Branch(SystemZII::BranchC, SystemZ::CCMASK_ICMP,
1497 MI.getOperand(2).getImm(), &MI.getOperand(3));
1498
1499 case SystemZ::CLIJ:
1500 case SystemZ::CLRJ:
1501 return SystemZII::Branch(SystemZII::BranchCL, SystemZ::CCMASK_ICMP,
1502 MI.getOperand(2).getImm(), &MI.getOperand(3));
1503
1504 case SystemZ::CGIJ:
1505 case SystemZ::CGRJ:
1506 return SystemZII::Branch(SystemZII::BranchCG, SystemZ::CCMASK_ICMP,
1507 MI.getOperand(2).getImm(), &MI.getOperand(3));
1508
1509 case SystemZ::CLGIJ:
1510 case SystemZ::CLGRJ:
1511 return SystemZII::Branch(SystemZII::BranchCLG, SystemZ::CCMASK_ICMP,
1512 MI.getOperand(2).getImm(), &MI.getOperand(3));
1513
1514 default:
1515 llvm_unreachable("Unrecognized branch opcode")::llvm::llvm_unreachable_internal("Unrecognized branch opcode"
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1515)
;
1516 }
1517}
1518
1519void SystemZInstrInfo::getLoadStoreOpcodes(const TargetRegisterClass *RC,
1520 unsigned &LoadOpcode,
1521 unsigned &StoreOpcode) const {
1522 if (RC == &SystemZ::GR32BitRegClass || RC == &SystemZ::ADDR32BitRegClass) {
1523 LoadOpcode = SystemZ::L;
1524 StoreOpcode = SystemZ::ST;
1525 } else if (RC == &SystemZ::GRH32BitRegClass) {
1526 LoadOpcode = SystemZ::LFH;
1527 StoreOpcode = SystemZ::STFH;
1528 } else if (RC == &SystemZ::GRX32BitRegClass) {
1529 LoadOpcode = SystemZ::LMux;
1530 StoreOpcode = SystemZ::STMux;
1531 } else if (RC == &SystemZ::GR64BitRegClass ||
1532 RC == &SystemZ::ADDR64BitRegClass) {
1533 LoadOpcode = SystemZ::LG;
1534 StoreOpcode = SystemZ::STG;
1535 } else if (RC == &SystemZ::GR128BitRegClass ||
1536 RC == &SystemZ::ADDR128BitRegClass) {
1537 LoadOpcode = SystemZ::L128;
1538 StoreOpcode = SystemZ::ST128;
1539 } else if (RC == &SystemZ::FP32BitRegClass) {
1540 LoadOpcode = SystemZ::LE;
1541 StoreOpcode = SystemZ::STE;
1542 } else if (RC == &SystemZ::FP64BitRegClass) {
1543 LoadOpcode = SystemZ::LD;
1544 StoreOpcode = SystemZ::STD;
1545 } else if (RC == &SystemZ::FP128BitRegClass) {
1546 LoadOpcode = SystemZ::LX;
1547 StoreOpcode = SystemZ::STX;
1548 } else if (RC == &SystemZ::VR32BitRegClass) {
1549 LoadOpcode = SystemZ::VL32;
1550 StoreOpcode = SystemZ::VST32;
1551 } else if (RC == &SystemZ::VR64BitRegClass) {
1552 LoadOpcode = SystemZ::VL64;
1553 StoreOpcode = SystemZ::VST64;
1554 } else if (RC == &SystemZ::VF128BitRegClass ||
1555 RC == &SystemZ::VR128BitRegClass) {
1556 LoadOpcode = SystemZ::VL;
1557 StoreOpcode = SystemZ::VST;
1558 } else
1559 llvm_unreachable("Unsupported regclass to load or store")::llvm::llvm_unreachable_internal("Unsupported regclass to load or store"
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1559)
;
1560}
1561
1562unsigned SystemZInstrInfo::getOpcodeForOffset(unsigned Opcode,
1563 int64_t Offset) const {
1564 const MCInstrDesc &MCID = get(Opcode);
1565 int64_t Offset2 = (MCID.TSFlags & SystemZII::Is128Bit ? Offset + 8 : Offset);
1566 if (isUInt<12>(Offset) && isUInt<12>(Offset2)) {
1567 // Get the instruction to use for unsigned 12-bit displacements.
1568 int Disp12Opcode = SystemZ::getDisp12Opcode(Opcode);
1569 if (Disp12Opcode >= 0)
1570 return Disp12Opcode;
1571
1572 // All address-related instructions can use unsigned 12-bit
1573 // displacements.
1574 return Opcode;
1575 }
1576 if (isInt<20>(Offset) && isInt<20>(Offset2)) {
1577 // Get the instruction to use for signed 20-bit displacements.
1578 int Disp20Opcode = SystemZ::getDisp20Opcode(Opcode);
1579 if (Disp20Opcode >= 0)
1580 return Disp20Opcode;
1581
1582 // Check whether Opcode allows signed 20-bit displacements.
1583 if (MCID.TSFlags & SystemZII::Has20BitOffset)
1584 return Opcode;
1585 }
1586 return 0;
1587}
1588
1589unsigned SystemZInstrInfo::getLoadAndTest(unsigned Opcode) const {
1590 switch (Opcode) {
1591 case SystemZ::L: return SystemZ::LT;
1592 case SystemZ::LY: return SystemZ::LT;
1593 case SystemZ::LG: return SystemZ::LTG;
1594 case SystemZ::LGF: return SystemZ::LTGF;
1595 case SystemZ::LR: return SystemZ::LTR;
1596 case SystemZ::LGFR: return SystemZ::LTGFR;
1597 case SystemZ::LGR: return SystemZ::LTGR;
1598 case SystemZ::LER: return SystemZ::LTEBR;
1599 case SystemZ::LDR: return SystemZ::LTDBR;
1600 case SystemZ::LXR: return SystemZ::LTXBR;
1601 case SystemZ::LCDFR: return SystemZ::LCDBR;
1602 case SystemZ::LPDFR: return SystemZ::LPDBR;
1603 case SystemZ::LNDFR: return SystemZ::LNDBR;
1604 case SystemZ::LCDFR_32: return SystemZ::LCEBR;
1605 case SystemZ::LPDFR_32: return SystemZ::LPEBR;
1606 case SystemZ::LNDFR_32: return SystemZ::LNEBR;
1607 // On zEC12 we prefer to use RISBGN. But if there is a chance to
1608 // actually use the condition code, we may turn it back into RISGB.
1609 // Note that RISBG is not really a "load-and-test" instruction,
1610 // but sets the same condition code values, so is OK to use here.
1611 case SystemZ::RISBGN: return SystemZ::RISBG;
1612 default: return 0;
1613 }
1614}
1615
1616// Return true if Mask matches the regexp 0*1+0*, given that zero masks
1617// have already been filtered out. Store the first set bit in LSB and
1618// the number of set bits in Length if so.
1619static bool isStringOfOnes(uint64_t Mask, unsigned &LSB, unsigned &Length) {
1620 unsigned First = findFirstSet(Mask);
1621 uint64_t Top = (Mask >> First) + 1;
8
The result of the right shift is undefined due to shifting by '4294967295', which is greater or equal to the width of type 'uint64_t'
1622 if ((Top & -Top) == Top) {
1623 LSB = First;
1624 Length = findFirstSet(Top);
1625 return true;
1626 }
1627 return false;
1628}
1629
1630bool SystemZInstrInfo::isRxSBGMask(uint64_t Mask, unsigned BitSize,
1631 unsigned &Start, unsigned &End) const {
1632 // Reject trivial all-zero masks.
1633 Mask &= allOnes(BitSize);
1634 if (Mask == 0)
5
Taking false branch
1635 return false;
1636
1637 // Handle the 1+0+ or 0+1+0* cases. Start then specifies the index of
1638 // the msb and End specifies the index of the lsb.
1639 unsigned LSB, Length;
1640 if (isStringOfOnes(Mask, LSB, Length)) {
6
Taking false branch
1641 Start = 63 - (LSB + Length - 1);
1642 End = 63 - LSB;
1643 return true;
1644 }
1645
1646 // Handle the wrap-around 1+0+1+ cases. Start then specifies the msb
1647 // of the low 1s and End specifies the lsb of the high 1s.
1648 if (isStringOfOnes(Mask ^ allOnes(BitSize), LSB, Length)) {
7
Calling 'isStringOfOnes'
1649 assert(LSB > 0 && "Bottom bit must be set")(static_cast <bool> (LSB > 0 && "Bottom bit must be set"
) ? void (0) : __assert_fail ("LSB > 0 && \"Bottom bit must be set\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1649, __extension__ __PRETTY_FUNCTION__))
;
1650 assert(LSB + Length < BitSize && "Top bit must be set")(static_cast <bool> (LSB + Length < BitSize &&
"Top bit must be set") ? void (0) : __assert_fail ("LSB + Length < BitSize && \"Top bit must be set\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1650, __extension__ __PRETTY_FUNCTION__))
;
1651 Start = 63 - (LSB - 1);
1652 End = 63 - (LSB + Length);
1653 return true;
1654 }
1655
1656 return false;
1657}
1658
1659unsigned SystemZInstrInfo::getFusedCompare(unsigned Opcode,
1660 SystemZII::FusedCompareType Type,
1661 const MachineInstr *MI) const {
1662 switch (Opcode) {
1663 case SystemZ::CHI:
1664 case SystemZ::CGHI:
1665 if (!(MI && isInt<8>(MI->getOperand(1).getImm())))
1666 return 0;
1667 break;
1668 case SystemZ::CLFI:
1669 case SystemZ::CLGFI:
1670 if (!(MI && isUInt<8>(MI->getOperand(1).getImm())))
1671 return 0;
1672 break;
1673 case SystemZ::CL:
1674 case SystemZ::CLG:
1675 if (!STI.hasMiscellaneousExtensions())
1676 return 0;
1677 if (!(MI && MI->getOperand(3).getReg() == 0))
1678 return 0;
1679 break;
1680 }
1681 switch (Type) {
1682 case SystemZII::CompareAndBranch:
1683 switch (Opcode) {
1684 case SystemZ::CR:
1685 return SystemZ::CRJ;
1686 case SystemZ::CGR:
1687 return SystemZ::CGRJ;
1688 case SystemZ::CHI:
1689 return SystemZ::CIJ;
1690 case SystemZ::CGHI:
1691 return SystemZ::CGIJ;
1692 case SystemZ::CLR:
1693 return SystemZ::CLRJ;
1694 case SystemZ::CLGR:
1695 return SystemZ::CLGRJ;
1696 case SystemZ::CLFI:
1697 return SystemZ::CLIJ;
1698 case SystemZ::CLGFI:
1699 return SystemZ::CLGIJ;
1700 default:
1701 return 0;
1702 }
1703 case SystemZII::CompareAndReturn:
1704 switch (Opcode) {
1705 case SystemZ::CR:
1706 return SystemZ::CRBReturn;
1707 case SystemZ::CGR:
1708 return SystemZ::CGRBReturn;
1709 case SystemZ::CHI:
1710 return SystemZ::CIBReturn;
1711 case SystemZ::CGHI:
1712 return SystemZ::CGIBReturn;
1713 case SystemZ::CLR:
1714 return SystemZ::CLRBReturn;
1715 case SystemZ::CLGR:
1716 return SystemZ::CLGRBReturn;
1717 case SystemZ::CLFI:
1718 return SystemZ::CLIBReturn;
1719 case SystemZ::CLGFI:
1720 return SystemZ::CLGIBReturn;
1721 default:
1722 return 0;
1723 }
1724 case SystemZII::CompareAndSibcall:
1725 switch (Opcode) {
1726 case SystemZ::CR:
1727 return SystemZ::CRBCall;
1728 case SystemZ::CGR:
1729 return SystemZ::CGRBCall;
1730 case SystemZ::CHI:
1731 return SystemZ::CIBCall;
1732 case SystemZ::CGHI:
1733 return SystemZ::CGIBCall;
1734 case SystemZ::CLR:
1735 return SystemZ::CLRBCall;
1736 case SystemZ::CLGR:
1737 return SystemZ::CLGRBCall;
1738 case SystemZ::CLFI:
1739 return SystemZ::CLIBCall;
1740 case SystemZ::CLGFI:
1741 return SystemZ::CLGIBCall;
1742 default:
1743 return 0;
1744 }
1745 case SystemZII::CompareAndTrap:
1746 switch (Opcode) {
1747 case SystemZ::CR:
1748 return SystemZ::CRT;
1749 case SystemZ::CGR:
1750 return SystemZ::CGRT;
1751 case SystemZ::CHI:
1752 return SystemZ::CIT;
1753 case SystemZ::CGHI:
1754 return SystemZ::CGIT;
1755 case SystemZ::CLR:
1756 return SystemZ::CLRT;
1757 case SystemZ::CLGR:
1758 return SystemZ::CLGRT;
1759 case SystemZ::CLFI:
1760 return SystemZ::CLFIT;
1761 case SystemZ::CLGFI:
1762 return SystemZ::CLGIT;
1763 case SystemZ::CL:
1764 return SystemZ::CLT;
1765 case SystemZ::CLG:
1766 return SystemZ::CLGT;
1767 default:
1768 return 0;
1769 }
1770 }
1771 return 0;
1772}
1773
1774unsigned SystemZInstrInfo::getLoadAndTrap(unsigned Opcode) const {
1775 if (!STI.hasLoadAndTrap())
1776 return 0;
1777 switch (Opcode) {
1778 case SystemZ::L:
1779 case SystemZ::LY:
1780 return SystemZ::LAT;
1781 case SystemZ::LG:
1782 return SystemZ::LGAT;
1783 case SystemZ::LFH:
1784 return SystemZ::LFHAT;
1785 case SystemZ::LLGF:
1786 return SystemZ::LLGFAT;
1787 case SystemZ::LLGT:
1788 return SystemZ::LLGTAT;
1789 }
1790 return 0;
1791}
1792
1793void SystemZInstrInfo::loadImmediate(MachineBasicBlock &MBB,
1794 MachineBasicBlock::iterator MBBI,
1795 unsigned Reg, uint64_t Value) const {
1796 DebugLoc DL = MBBI != MBB.end() ? MBBI->getDebugLoc() : DebugLoc();
1797 unsigned Opcode;
1798 if (isInt<16>(Value))
1799 Opcode = SystemZ::LGHI;
1800 else if (SystemZ::isImmLL(Value))
1801 Opcode = SystemZ::LLILL;
1802 else if (SystemZ::isImmLH(Value)) {
1803 Opcode = SystemZ::LLILH;
1804 Value >>= 16;
1805 } else {
1806 assert(isInt<32>(Value) && "Huge values not handled yet")(static_cast <bool> (isInt<32>(Value) && "Huge values not handled yet"
) ? void (0) : __assert_fail ("isInt<32>(Value) && \"Huge values not handled yet\""
, "/build/llvm-toolchain-snapshot-7~svn329677/lib/Target/SystemZ/SystemZInstrInfo.cpp"
, 1806, __extension__ __PRETTY_FUNCTION__))
;
1807 Opcode = SystemZ::LGFI;
1808 }
1809 BuildMI(MBB, MBBI, DL, get(Opcode), Reg).addImm(Value);
1810}
1811
1812bool SystemZInstrInfo::
1813areMemAccessesTriviallyDisjoint(MachineInstr &MIa, MachineInstr &MIb,
1814 AliasAnalysis *AA) const {
1815
1816 if (!MIa.hasOneMemOperand() || !MIb.hasOneMemOperand())
1817 return false;
1818
1819 // If mem-operands show that the same address Value is used by both
1820 // instructions, check for non-overlapping offsets and widths. Not
1821 // sure if a register based analysis would be an improvement...
1822
1823 MachineMemOperand *MMOa = *MIa.memoperands_begin();
1824 MachineMemOperand *MMOb = *MIb.memoperands_begin();
1825 const Value *VALa = MMOa->getValue();
1826 const Value *VALb = MMOb->getValue();
1827 bool SameVal = (VALa && VALb && (VALa == VALb));
1828 if (!SameVal) {
1829 const PseudoSourceValue *PSVa = MMOa->getPseudoValue();
1830 const PseudoSourceValue *PSVb = MMOb->getPseudoValue();
1831 if (PSVa && PSVb && (PSVa == PSVb))
1832 SameVal = true;
1833 }
1834 if (SameVal) {
1835 int OffsetA = MMOa->getOffset(), OffsetB = MMOb->getOffset();
1836 int WidthA = MMOa->getSize(), WidthB = MMOb->getSize();
1837 int LowOffset = OffsetA < OffsetB ? OffsetA : OffsetB;
1838 int HighOffset = OffsetA < OffsetB ? OffsetB : OffsetA;
1839 int LowWidth = (LowOffset == OffsetA) ? WidthA : WidthB;
1840 if (LowOffset + LowWidth <= HighOffset)
1841 return true;
1842 }
1843
1844 return false;
1845}