LLVM  10.0.0svn
PPCSubtarget.h
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1 //===-- PPCSubtarget.h - Define Subtarget for the PPC ----------*- C++ -*--===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file declares the PowerPC specific subclass of TargetSubtargetInfo.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_POWERPC_PPCSUBTARGET_H
14 #define LLVM_LIB_TARGET_POWERPC_PPCSUBTARGET_H
15 
16 #include "PPCFrameLowering.h"
17 #include "PPCISelLowering.h"
18 #include "PPCInstrInfo.h"
19 #include "llvm/ADT/Triple.h"
22 #include "llvm/IR/DataLayout.h"
24 #include <string>
25 
26 #define GET_SUBTARGETINFO_HEADER
27 #include "PPCGenSubtargetInfo.inc"
28 
29 // GCC #defines PPC on Linux but we use it as our namespace name
30 #undef PPC
31 
32 namespace llvm {
33 class StringRef;
34 
35 namespace PPC {
36  // -m directive values.
37  enum {
61  };
62 }
63 
64 class GlobalValue;
65 class TargetMachine;
66 
68 public:
69  enum POPCNTDKind {
72  POPCNTD_Fast
73  };
74 
75 protected:
76  /// TargetTriple - What processor and OS we're targeting.
78 
79  /// stackAlignment - The minimum alignment known to hold of the stack frame on
80  /// entry to the function and which must be maintained by every function.
81  unsigned StackAlignment;
82 
83  /// Selected instruction itineraries (one entry per itinerary class.)
85 
86  /// Which cpu directive was used.
87  unsigned DarwinDirective;
88 
89  /// Used by the ISel to turn in optimizations for POWER4-derived architectures
90  bool HasMFOCRF;
93  bool UseCRBits;
95  bool IsPPC64;
96  bool HasAltivec;
97  bool HasFPU;
98  bool HasSPE;
99  bool HasQPX;
100  bool HasVSX;
107  bool HasFCPSGN;
108  bool HasFSQRT;
109  bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
111  bool HasSTFIWX;
112  bool HasLFIWAX;
113  bool HasFPRND;
114  bool HasFPCVT;
115  bool HasISEL;
116  bool HasBPERMD;
117  bool HasExtDiv;
118  bool HasCMPB;
119  bool HasLDBRX;
120  bool IsBookE;
122  bool IsE500;
123  bool IsPPC4xx;
124  bool IsPPC6xx;
129  bool HasICBT;
133  bool HasHTM;
135  bool IsISA3_0;
137  bool SecurePlt;
141 
143 
144  /// When targeting QPX running a stock PPC64 Linux kernel where the stack
145  /// alignment has not been changed, we need to keep the 16-byte alignment
146  /// of the stack.
148 
154 
155 public:
156  /// This constructor initializes the data members to match that
157  /// of the specified triple.
158  ///
159  PPCSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
160  const PPCTargetMachine &TM);
161 
162  /// ParseSubtargetFeatures - Parses features string setting specified
163  /// subtarget options. Definition of function is auto generated by tblgen.
164  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
165 
166  /// getStackAlignment - Returns the minimum alignment known to hold of the
167  /// stack frame on entry to the function and which must be maintained by every
168  /// function for this subtarget.
169  unsigned getStackAlignment() const { return StackAlignment; }
170 
171  /// getDarwinDirective - Returns the -m directive specified for the cpu.
172  ///
173  unsigned getDarwinDirective() const { return DarwinDirective; }
174 
175  /// getInstrItins - Return the instruction itineraries based on subtarget
176  /// selection.
177  const InstrItineraryData *getInstrItineraryData() const override {
178  return &InstrItins;
179  }
180 
181  const PPCFrameLowering *getFrameLowering() const override {
182  return &FrameLowering;
183  }
184  const PPCInstrInfo *getInstrInfo() const override { return &InstrInfo; }
185  const PPCTargetLowering *getTargetLowering() const override {
186  return &TLInfo;
187  }
188  const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
189  return &TSInfo;
190  }
191  const PPCRegisterInfo *getRegisterInfo() const override {
192  return &getInstrInfo()->getRegisterInfo();
193  }
194  const PPCTargetMachine &getTargetMachine() const { return TM; }
195 
196  /// initializeSubtargetDependencies - Initializes using a CPU and feature string
197  /// so that we can use initializer lists for subtarget initialization.
198  PPCSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
199 
200 private:
201  void initializeEnvironment();
202  void initSubtargetFeatures(StringRef CPU, StringRef FS);
203 
204 public:
205  /// isPPC64 - Return true if we are generating code for 64-bit pointer mode.
206  ///
207  bool isPPC64() const;
208 
209  /// has64BitSupport - Return true if the selected CPU supports 64-bit
210  /// instructions, regardless of whether we are in 32-bit or 64-bit mode.
211  bool has64BitSupport() const { return Has64BitSupport; }
212  // useSoftFloat - Return true if soft-float option is turned on.
213  bool useSoftFloat() const {
214  if (isAIXABI() && !HasHardFloat)
215  report_fatal_error("soft-float is not yet supported on AIX.");
216  return !HasHardFloat;
217  }
218 
219  /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit
220  /// registers in 32-bit mode when possible. This can only true if
221  /// has64BitSupport() returns true.
222  bool use64BitRegs() const { return Use64BitRegs; }
223 
224  /// useCRBits - Return true if we should store and manipulate i1 values in
225  /// the individual condition register bits.
226  bool useCRBits() const { return UseCRBits; }
227 
228  /// hasLazyResolverStub - Return true if accesses to the specified global have
229  /// to go through a dyld lazy resolution stub. This means that an extra load
230  /// is required to get the address of the global.
231  bool hasLazyResolverStub(const GlobalValue *GV) const;
232 
233  // isLittleEndian - True if generating little-endian code
234  bool isLittleEndian() const { return IsLittleEndian; }
235 
236  // Specific obvious features.
237  bool hasFCPSGN() const { return HasFCPSGN; }
238  bool hasFSQRT() const { return HasFSQRT; }
239  bool hasFRE() const { return HasFRE; }
240  bool hasFRES() const { return HasFRES; }
241  bool hasFRSQRTE() const { return HasFRSQRTE; }
242  bool hasFRSQRTES() const { return HasFRSQRTES; }
243  bool hasRecipPrec() const { return HasRecipPrec; }
244  bool hasSTFIWX() const { return HasSTFIWX; }
245  bool hasLFIWAX() const { return HasLFIWAX; }
246  bool hasFPRND() const { return HasFPRND; }
247  bool hasFPCVT() const { return HasFPCVT; }
248  bool hasAltivec() const { return HasAltivec; }
249  bool hasSPE() const { return HasSPE; }
250  bool hasFPU() const { return HasFPU; }
251  bool hasQPX() const { return HasQPX; }
252  bool hasVSX() const { return HasVSX; }
253  bool needsTwoConstNR() const { return NeedsTwoConstNR; }
254  bool hasP8Vector() const { return HasP8Vector; }
255  bool hasP8Altivec() const { return HasP8Altivec; }
256  bool hasP8Crypto() const { return HasP8Crypto; }
257  bool hasP9Vector() const { return HasP9Vector; }
258  bool hasP9Altivec() const { return HasP9Altivec; }
259  bool hasMFOCRF() const { return HasMFOCRF; }
260  bool hasISEL() const { return HasISEL; }
261  bool hasBPERMD() const { return HasBPERMD; }
262  bool hasExtDiv() const { return HasExtDiv; }
263  bool hasCMPB() const { return HasCMPB; }
264  bool hasLDBRX() const { return HasLDBRX; }
265  bool isBookE() const { return IsBookE; }
266  bool hasOnlyMSYNC() const { return HasOnlyMSYNC; }
267  bool isPPC4xx() const { return IsPPC4xx; }
268  bool isPPC6xx() const { return IsPPC6xx; }
269  bool isSecurePlt() const {return SecurePlt; }
270  bool vectorsUseTwoUnits() const {return VectorsUseTwoUnits; }
271  bool isE500() const { return IsE500; }
272  bool isFeatureMFTB() const { return FeatureMFTB; }
273  bool isDeprecatedDST() const { return DeprecatedDST; }
274  bool hasICBT() const { return HasICBT; }
276  return HasInvariantFunctionDescriptors;
277  }
278  bool usePPCPreRASchedStrategy() const { return UsePPCPreRASchedStrategy; }
279  bool usePPCPostRASchedStrategy() const { return UsePPCPostRASchedStrategy; }
280  bool hasPartwordAtomics() const { return HasPartwordAtomics; }
281  bool hasDirectMove() const { return HasDirectMove; }
282 
283  bool isQPXStackUnaligned() const { return IsQPXStackUnaligned; }
284  unsigned getPlatformStackAlignment() const {
285  if ((hasQPX() || isBGQ()) && !isQPXStackUnaligned())
286  return 32;
287 
288  return 16;
289  }
290 
291  // DarwinABI has a 224-byte red zone. PPC32 SVR4ABI(Non-DarwinABI) has no
292  // red zone and PPC64 SVR4ABI has a 288-byte red zone.
293  unsigned getRedZoneSize() const {
294  return isDarwinABI() ? 224 : (isPPC64() ? 288 : 0);
295  }
296 
297  bool hasHTM() const { return HasHTM; }
298  bool hasFloat128() const { return HasFloat128; }
299  bool isISA3_0() const { return IsISA3_0; }
300  bool useLongCalls() const { return UseLongCalls; }
301  bool needsSwapsForVSXMemOps() const {
302  return hasVSX() && isLittleEndian() && !hasP9Vector();
303  }
304 
305  POPCNTDKind hasPOPCNTD() const { return HasPOPCNTD; }
306 
307  const Triple &getTargetTriple() const { return TargetTriple; }
308 
309  /// isDarwin - True if this is any darwin platform.
310  bool isDarwin() const { return TargetTriple.isMacOSX(); }
311  /// isBGQ - True if this is a BG/Q platform.
312  bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; }
313 
314  bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); }
315  bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); }
316  bool isTargetLinux() const { return TargetTriple.isOSLinux(); }
317 
318  bool isDarwinABI() const { return isTargetMachO() || isDarwin(); }
319  bool isAIXABI() const { return TargetTriple.isOSAIX(); }
320  bool isSVR4ABI() const { return !isDarwinABI() && !isAIXABI(); }
321  bool isELFv2ABI() const;
322 
323  bool is64BitELFABI() const { return isSVR4ABI() && isPPC64(); }
324  bool is32BitELFABI() const { return isSVR4ABI() && !isPPC64(); }
325 
326  /// Originally, this function return hasISEL(). Now we always enable it,
327  /// but may expand the ISEL instruction later.
328  bool enableEarlyIfConversion() const override { return true; }
329 
330  /// Scheduling customization.
331  bool enableMachineScheduler() const override;
332  /// Pipeliner customization.
333  bool enableMachinePipeliner() const override;
334  /// Machine Pipeliner customization
335  bool useDFAforSMS() const override;
336  /// This overrides the PostRAScheduler bit in the SchedModel for each CPU.
337  bool enablePostRAScheduler() const override;
338  AntiDepBreakMode getAntiDepBreakMode() const override;
339  void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const override;
340 
341  void overrideSchedPolicy(MachineSchedPolicy &Policy,
342  unsigned NumRegionInstrs) const override;
343  bool useAA() const override;
344 
345  bool enableSubRegLiveness() const override;
346 
347  /// classifyGlobalReference - Classify a global variable reference for the
348  /// current subtarget accourding to how we should reference it.
349  unsigned char classifyGlobalReference(const GlobalValue *GV) const;
350 
351  bool isXRaySupported() const override { return IsPPC64 && IsLittleEndian; }
352 };
353 } // End llvm namespace
354 
355 #endif
bool isAIXABI() const
Definition: PPCSubtarget.h:319
bool hasFPCVT() const
Definition: PPCSubtarget.h:247
bool enableEarlyIfConversion() const override
Originally, this function return hasISEL().
Definition: PPCSubtarget.h:328
bool hasBPERMD() const
Definition: PPCSubtarget.h:261
LLVM_ATTRIBUTE_NORETURN void report_fatal_error(Error Err, bool gen_crash_diag=true)
Report a serious error, calling any installed error handler.
Definition: Error.cpp:139
This class represents lattice values for constants.
Definition: AllocatorList.h:23
bool isMacOSX() const
isMacOSX - Is this a Mac OS X triple.
Definition: Triple.h:453
const SelectionDAGTargetInfo * getSelectionDAGInfo() const override
Definition: PPCSubtarget.h:188
bool isOSBinFormatELF() const
Tests whether the OS uses the ELF binary format.
Definition: Triple.h:623
bool IsQPXStackUnaligned
When targeting QPX running a stock PPC64 Linux kernel where the stack alignment has not been changed...
Definition: PPCSubtarget.h:147
bool hasVSX() const
Definition: PPCSubtarget.h:252
bool hasFSQRT() const
Definition: PPCSubtarget.h:238
bool isBGQ() const
isBGQ - True if this is a BG/Q platform.
Definition: PPCSubtarget.h:312
unsigned StackAlignment
stackAlignment - The minimum alignment known to hold of the stack frame on entry to the function and ...
Definition: PPCSubtarget.h:81
bool hasQPX() const
Definition: PPCSubtarget.h:251
bool hasSPE() const
Definition: PPCSubtarget.h:249
bool isTargetLinux() const
Definition: PPCSubtarget.h:316
bool needsTwoConstNR() const
Definition: PPCSubtarget.h:253
bool isISA3_0() const
Definition: PPCSubtarget.h:299
SelectionDAGTargetInfo TSInfo
Definition: PPCSubtarget.h:153
unsigned getPlatformStackAlignment() const
Definition: PPCSubtarget.h:284
bool hasDirectMove() const
Definition: PPCSubtarget.h:281
POPCNTDKind HasPOPCNTD
Definition: PPCSubtarget.h:142
bool hasLDBRX() const
Definition: PPCSubtarget.h:264
bool hasMFOCRF() const
Definition: PPCSubtarget.h:259
bool hasP8Crypto() const
Definition: PPCSubtarget.h:256
unsigned DarwinDirective
Which cpu directive was used.
Definition: PPCSubtarget.h:87
bool is64BitELFABI() const
Definition: PPCSubtarget.h:323
bool isTargetELF() const
Definition: PPCSubtarget.h:314
bool useSoftFloat() const
Definition: PPCSubtarget.h:213
bool hasExtDiv() const
Definition: PPCSubtarget.h:262
bool has64BitSupport() const
has64BitSupport - Return true if the selected CPU supports 64-bit instructions, regardless of whether...
Definition: PPCSubtarget.h:211
bool hasP9Vector() const
Definition: PPCSubtarget.h:257
Itinerary data supplied by a subtarget to be used by a target.
const PPCTargetMachine & getTargetMachine() const
Definition: PPCSubtarget.h:194
InstrItineraryData InstrItins
Selected instruction itineraries (one entry per itinerary class.)
Definition: PPCSubtarget.h:84
bool hasSTFIWX() const
Definition: PPCSubtarget.h:244
bool hasInvariantFunctionDescriptors() const
Definition: PPCSubtarget.h:275
bool vectorsUseTwoUnits() const
Definition: PPCSubtarget.h:270
bool isSecurePlt() const
Definition: PPCSubtarget.h:269
bool hasFRES() const
Definition: PPCSubtarget.h:240
VendorType getVendor() const
getVendor - Get the parsed vendor type of this triple.
Definition: Triple.h:302
bool hasFRSQRTES() const
Definition: PPCSubtarget.h:242
bool HasInvariantFunctionDescriptors
Definition: PPCSubtarget.h:130
PPCFrameLowering FrameLowering
Definition: PPCSubtarget.h:150
PPCInstrInfo InstrInfo
Definition: PPCSubtarget.h:151
const PPCFrameLowering * getFrameLowering() const override
Definition: PPCSubtarget.h:181
bool hasPartwordAtomics() const
Definition: PPCSubtarget.h:280
static bool isDarwin(object::Archive::Kind Kind)
const PPCTargetLowering * getTargetLowering() const override
Definition: PPCSubtarget.h:185
bool hasFPRND() const
Definition: PPCSubtarget.h:246
bool isQPXStackUnaligned() const
Definition: PPCSubtarget.h:283
Common code between 32-bit and 64-bit PowerPC targets.
bool isOSBinFormatMachO() const
Tests whether the environment is MachO.
Definition: Triple.h:633
Targets can subclass this to parameterize the SelectionDAG lowering and instruction selection process...
bool isLittleEndian() const
Definition: PPCSubtarget.h:234
unsigned getDarwinDirective() const
getDarwinDirective - Returns the -m directive specified for the cpu.
Definition: PPCSubtarget.h:173
const PPCTargetMachine & TM
Definition: PPCSubtarget.h:149
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:43
bool hasP8Vector() const
Definition: PPCSubtarget.h:254
bool isOSAIX() const
Tests whether the OS is AIX.
Definition: Triple.h:618
bool isE500() const
Definition: PPCSubtarget.h:271
const PPCRegisterInfo * getRegisterInfo() const override
Definition: PPCSubtarget.h:191
bool isBookE() const
Definition: PPCSubtarget.h:265
const PPCInstrInfo * getInstrInfo() const override
Definition: PPCSubtarget.h:184
bool hasCMPB() const
Definition: PPCSubtarget.h:263
bool is32BitELFABI() const
Definition: PPCSubtarget.h:324
bool isOSLinux() const
Tests whether the OS is Linux.
Definition: Triple.h:586
bool isDarwinABI() const
Definition: PPCSubtarget.h:318
bool isFeatureMFTB() const
Definition: PPCSubtarget.h:272
bool hasP8Altivec() const
Definition: PPCSubtarget.h:255
bool UsePPCPostRASchedStrategy
Definition: PPCSubtarget.h:140
bool hasP9Altivec() const
Definition: PPCSubtarget.h:258
bool hasFPU() const
Definition: PPCSubtarget.h:250
unsigned getRedZoneSize() const
Definition: PPCSubtarget.h:293
bool hasRecipPrec() const
Definition: PPCSubtarget.h:243
Triple TargetTriple
TargetTriple - What processor and OS we&#39;re targeting.
Definition: PPCSubtarget.h:77
bool isPPC4xx() const
Definition: PPCSubtarget.h:267
bool hasHTM() const
Definition: PPCSubtarget.h:297
bool useLongCalls() const
Definition: PPCSubtarget.h:300
bool use64BitRegs() const
use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit registers in 32-bit mode when...
Definition: PPCSubtarget.h:222
bool hasICBT() const
Definition: PPCSubtarget.h:274
Define a generic scheduling policy for targets that don&#39;t provide their own MachineSchedStrategy.
const InstrItineraryData * getInstrItineraryData() const override
getInstrItins - Return the instruction itineraries based on subtarget selection.
Definition: PPCSubtarget.h:177
bool hasFloat128() const
Definition: PPCSubtarget.h:298
bool hasFRSQRTE() const
Definition: PPCSubtarget.h:241
bool hasLFIWAX() const
Definition: PPCSubtarget.h:245
bool hasFCPSGN() const
Definition: PPCSubtarget.h:237
PPCTargetLowering TLInfo
Definition: PPCSubtarget.h:152
bool hasAltivec() const
Definition: PPCSubtarget.h:248
bool hasISEL() const
Definition: PPCSubtarget.h:260
bool useCRBits() const
useCRBits - Return true if we should store and manipulate i1 values in the individual condition regis...
Definition: PPCSubtarget.h:226
bool isDarwin() const
isDarwin - True if this is any darwin platform.
Definition: PPCSubtarget.h:310
bool usePPCPostRASchedStrategy() const
Definition: PPCSubtarget.h:279
bool hasFRE() const
Definition: PPCSubtarget.h:239
POPCNTDKind hasPOPCNTD() const
Definition: PPCSubtarget.h:305
bool needsSwapsForVSXMemOps() const
Definition: PPCSubtarget.h:301
bool isTargetMachO() const
Definition: PPCSubtarget.h:315
Primary interface to the complete machine description for the target machine.
Definition: TargetMachine.h:65
bool usePPCPreRASchedStrategy() const
Definition: PPCSubtarget.h:278
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:48
bool isSVR4ABI() const
Definition: PPCSubtarget.h:320
bool isXRaySupported() const override
Definition: PPCSubtarget.h:351
bool HasMFOCRF
Used by the ISel to turn in optimizations for POWER4-derived architectures.
Definition: PPCSubtarget.h:90
const Triple & getTargetTriple() const
Definition: PPCSubtarget.h:307
unsigned getStackAlignment() const
getStackAlignment - Returns the minimum alignment known to hold of the stack frame on entry to the fu...
Definition: PPCSubtarget.h:169
bool hasOnlyMSYNC() const
Definition: PPCSubtarget.h:266
bool isPPC6xx() const
Definition: PPCSubtarget.h:268
bool isDeprecatedDST() const
Definition: PPCSubtarget.h:273