lib/Target/PowerPC/PPCSubtarget.h

   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"
  20 #include "llvm/CodeGen/SelectionDAGTargetInfo.h"
  21 #include "llvm/CodeGen/TargetSubtargetInfo.h"
  22 #include "llvm/IR/DataLayout.h"
  23 #include "llvm/MC/MCInstrItineraries.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 {
  38     DIR_NONE,
  39     DIR_32,
  40     DIR_440,
  41     DIR_601,
  42     DIR_602,
  43     DIR_603,
  44     DIR_7400,
  45     DIR_750,
  46     DIR_970,
  47     DIR_A2,
  48     DIR_E500,
  49     DIR_E500mc,
  50     DIR_E5500,
  51     DIR_PWR3,
  52     DIR_PWR4,
  53     DIR_PWR5,
  54     DIR_PWR5X,
  55     DIR_PWR6,
  56     DIR_PWR6X,
  57     DIR_PWR7,
  58     DIR_PWR8,
  59     DIR_PWR9,
  60     DIR_64
  61   };
  62 }
  63
  64 class GlobalValue;
  65 class TargetMachine;
  66
  67 class PPCSubtarget : public PPCGenSubtargetInfo {
  68 public:
  69   enum POPCNTDKind {
  70     POPCNTD_Unavailable,
  71     POPCNTD_Slow,
  72     POPCNTD_Fast
  73   };
  74
  75 protected:
  76   /// TargetTriple - What processor and OS we're targeting.
  77   Triple TargetTriple;
  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.)
  84   InstrItineraryData InstrItins;
  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;
  91   bool Has64BitSupport;
  92   bool Use64BitRegs;
  93   bool UseCRBits;
  94   bool HasHardFloat;
  95   bool IsPPC64;
  96   bool HasAltivec;
  97   bool HasFPU;
  98   bool HasSPE;
  99   bool HasQPX;
 100   bool HasVSX;
 101   bool NeedsTwoConstNR;
 102   bool HasP8Vector;
 103   bool HasP8Altivec;
 104   bool HasP8Crypto;
 105   bool HasP9Vector;
 106   bool HasP9Altivec;
 107   bool HasFCPSGN;
 108   bool HasFSQRT;
 109   bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES;
 110   bool HasRecipPrec;
 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;
 121   bool HasOnlyMSYNC;
 122   bool IsE500;
 123   bool IsPPC4xx;
 124   bool IsPPC6xx;
 125   bool FeatureMFTB;
 126   bool DeprecatedDST;
 127   bool HasLazyResolverStubs;
 128   bool IsLittleEndian;
 129   bool HasICBT;
 130   bool HasInvariantFunctionDescriptors;
 131   bool HasPartwordAtomics;
 132   bool HasDirectMove;
 133   bool HasHTM;
 134   bool HasFloat128;
 135   bool IsISA3_0;
 136   bool UseLongCalls;
 137   bool SecurePlt;
 138   bool VectorsUseTwoUnits;
 139   bool UsePPCPreRASchedStrategy;
 140   bool UsePPCPostRASchedStrategy;
 141
 142   POPCNTDKind HasPOPCNTD;
 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.
 147   bool IsQPXStackUnaligned;
 148
 149   const PPCTargetMachine &TM;
 150   PPCFrameLowering FrameLowering;
 151   PPCInstrInfo InstrInfo;
 152   PPCTargetLowering TLInfo;
 153   SelectionDAGTargetInfo TSInfo;
 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; }
 275   bool hasInvariantFunctionDescriptors() const {
 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