1 //===-- PPCSubtarget.h - Define Subtarget for the PPC ----------*- C++ -*--===// 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 declares the PowerPC specific subclass of TargetSubtargetInfo. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef POWERPCSUBTARGET_H 15 #define POWERPCSUBTARGET_H 16 17 #include "PPCFrameLowering.h" 18 #include "PPCInstrInfo.h" 19 #include "PPCISelLowering.h" 20 #include "PPCJITInfo.h" 21 #include "PPCSelectionDAGInfo.h" 22 #include "llvm/ADT/Triple.h" 23 #include "llvm/IR/DataLayout.h" 24 #include "llvm/MC/MCInstrItineraries.h" 25 #include "llvm/Target/TargetSubtargetInfo.h" 26 #include <string> 27 28 #define GET_SUBTARGETINFO_HEADER 29 #include "PPCGenSubtargetInfo.inc" 30 31 // GCC #defines PPC on Linux but we use it as our namespace name 32 #undef PPC 33 34 namespace llvm { 35 class StringRef; 36 37 namespace PPC { 38 // -m directive values. 39 enum { 40 DIR_NONE, 41 DIR_32, 42 DIR_440, 43 DIR_601, 44 DIR_602, 45 DIR_603, 46 DIR_7400, 47 DIR_750, 48 DIR_970, 49 DIR_A2, 50 DIR_E500mc, 51 DIR_E5500, 52 DIR_PWR3, 53 DIR_PWR4, 54 DIR_PWR5, 55 DIR_PWR5X, 56 DIR_PWR6, 57 DIR_PWR6X, 58 DIR_PWR7, 59 DIR_PWR8, 60 DIR_64 61 }; 62 } 63 64 class GlobalValue; 65 class TargetMachine; 66 67 class PPCSubtarget : public PPCGenSubtargetInfo { 68 protected: 69 /// stackAlignment - The minimum alignment known to hold of the stack frame on 70 /// entry to the function and which must be maintained by every function. 71 unsigned StackAlignment; 72 73 /// Selected instruction itineraries (one entry per itinerary class.) 74 InstrItineraryData InstrItins; 75 76 /// Which cpu directive was used. 77 unsigned DarwinDirective; 78 79 /// Used by the ISel to turn in optimizations for POWER4-derived architectures 80 bool HasMFOCRF; 81 bool Has64BitSupport; 82 bool Use64BitRegs; 83 bool UseCRBits; 84 bool IsPPC64; 85 bool HasAltivec; 86 bool HasQPX; 87 bool HasVSX; 88 bool HasFCPSGN; 89 bool HasFSQRT; 90 bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES; 91 bool HasRecipPrec; 92 bool HasSTFIWX; 93 bool HasLFIWAX; 94 bool HasFPRND; 95 bool HasFPCVT; 96 bool HasISEL; 97 bool HasPOPCNTD; 98 bool HasLDBRX; 99 bool IsBookE; 100 bool DeprecatedMFTB; 101 bool DeprecatedDST; 102 bool HasLazyResolverStubs; 103 bool IsJITCodeModel; 104 bool IsLittleEndian; 105 106 /// TargetTriple - What processor and OS we're targeting. 107 Triple TargetTriple; 108 109 /// OptLevel - What default optimization level we're emitting code for. 110 CodeGenOpt::Level OptLevel; 111 112 PPCFrameLowering FrameLowering; 113 const DataLayout DL; 114 PPCInstrInfo InstrInfo; 115 PPCJITInfo JITInfo; 116 PPCTargetLowering TLInfo; 117 PPCSelectionDAGInfo TSInfo; 118 119 public: 120 /// This constructor initializes the data members to match that 121 /// of the specified triple. 122 /// 123 PPCSubtarget(const std::string &TT, const std::string &CPU, 124 const std::string &FS, PPCTargetMachine &TM, bool is64Bit, 125 CodeGenOpt::Level OptLevel); 126 127 /// ParseSubtargetFeatures - Parses features string setting specified 128 /// subtarget options. Definition of function is auto generated by tblgen. 129 void ParseSubtargetFeatures(StringRef CPU, StringRef FS); 130 131 /// SetJITMode - This is called to inform the subtarget info that we are 132 /// producing code for the JIT. 133 void SetJITMode(); 134 135 /// getStackAlignment - Returns the minimum alignment known to hold of the 136 /// stack frame on entry to the function and which must be maintained by every 137 /// function for this subtarget. getStackAlignment()138 unsigned getStackAlignment() const { return StackAlignment; } 139 140 /// getDarwinDirective - Returns the -m directive specified for the cpu. 141 /// getDarwinDirective()142 unsigned getDarwinDirective() const { return DarwinDirective; } 143 144 /// getInstrItins - Return the instruction itineraries based on subtarget 145 /// selection. getInstrItineraryData()146 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; } 147 getFrameLowering()148 const PPCFrameLowering *getFrameLowering() const { return &FrameLowering; } getDataLayout()149 const DataLayout *getDataLayout() const { return &DL; } getInstrInfo()150 const PPCInstrInfo *getInstrInfo() const { return &InstrInfo; } getJITInfo()151 PPCJITInfo *getJITInfo() { return &JITInfo; } getTargetLowering()152 const PPCTargetLowering *getTargetLowering() const { return &TLInfo; } getSelectionDAGInfo()153 const PPCSelectionDAGInfo *getSelectionDAGInfo() const { return &TSInfo; } 154 155 /// initializeSubtargetDependencies - Initializes using a CPU and feature string 156 /// so that we can use initializer lists for subtarget initialization. 157 PPCSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS); 158 159 /// \brief Reset the features for the PowerPC target. 160 void resetSubtargetFeatures(const MachineFunction *MF) override; 161 private: 162 void initializeEnvironment(); 163 void resetSubtargetFeatures(StringRef CPU, StringRef FS); 164 165 public: 166 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode. 167 /// isPPC64()168 bool isPPC64() const { return IsPPC64; } 169 170 /// has64BitSupport - Return true if the selected CPU supports 64-bit 171 /// instructions, regardless of whether we are in 32-bit or 64-bit mode. has64BitSupport()172 bool has64BitSupport() const { return Has64BitSupport; } 173 174 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit 175 /// registers in 32-bit mode when possible. This can only true if 176 /// has64BitSupport() returns true. use64BitRegs()177 bool use64BitRegs() const { return Use64BitRegs; } 178 179 /// useCRBits - Return true if we should store and manipulate i1 values in 180 /// the individual condition register bits. useCRBits()181 bool useCRBits() const { return UseCRBits; } 182 183 /// hasLazyResolverStub - Return true if accesses to the specified global have 184 /// to go through a dyld lazy resolution stub. This means that an extra load 185 /// is required to get the address of the global. 186 bool hasLazyResolverStub(const GlobalValue *GV, 187 const TargetMachine &TM) const; 188 189 // isJITCodeModel - True if we're generating code for the JIT isJITCodeModel()190 bool isJITCodeModel() const { return IsJITCodeModel; } 191 192 // isLittleEndian - True if generating little-endian code isLittleEndian()193 bool isLittleEndian() const { return IsLittleEndian; } 194 195 // Specific obvious features. hasFCPSGN()196 bool hasFCPSGN() const { return HasFCPSGN; } hasFSQRT()197 bool hasFSQRT() const { return HasFSQRT; } hasFRE()198 bool hasFRE() const { return HasFRE; } hasFRES()199 bool hasFRES() const { return HasFRES; } hasFRSQRTE()200 bool hasFRSQRTE() const { return HasFRSQRTE; } hasFRSQRTES()201 bool hasFRSQRTES() const { return HasFRSQRTES; } hasRecipPrec()202 bool hasRecipPrec() const { return HasRecipPrec; } hasSTFIWX()203 bool hasSTFIWX() const { return HasSTFIWX; } hasLFIWAX()204 bool hasLFIWAX() const { return HasLFIWAX; } hasFPRND()205 bool hasFPRND() const { return HasFPRND; } hasFPCVT()206 bool hasFPCVT() const { return HasFPCVT; } hasAltivec()207 bool hasAltivec() const { return HasAltivec; } hasQPX()208 bool hasQPX() const { return HasQPX; } hasVSX()209 bool hasVSX() const { return HasVSX; } hasMFOCRF()210 bool hasMFOCRF() const { return HasMFOCRF; } hasISEL()211 bool hasISEL() const { return HasISEL; } hasPOPCNTD()212 bool hasPOPCNTD() const { return HasPOPCNTD; } hasLDBRX()213 bool hasLDBRX() const { return HasLDBRX; } isBookE()214 bool isBookE() const { return IsBookE; } isDeprecatedMFTB()215 bool isDeprecatedMFTB() const { return DeprecatedMFTB; } isDeprecatedDST()216 bool isDeprecatedDST() const { return DeprecatedDST; } 217 getTargetTriple()218 const Triple &getTargetTriple() const { return TargetTriple; } 219 220 /// isDarwin - True if this is any darwin platform. isDarwin()221 bool isDarwin() const { return TargetTriple.isMacOSX(); } 222 /// isBGQ - True if this is a BG/Q platform. isBGQ()223 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; } 224 isDarwinABI()225 bool isDarwinABI() const { return isDarwin(); } isSVR4ABI()226 bool isSVR4ABI() const { return !isDarwin(); } 227 228 /// enablePostRAScheduler - True at 'More' optimization. 229 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel, 230 TargetSubtargetInfo::AntiDepBreakMode& Mode, 231 RegClassVector& CriticalPathRCs) const override; 232 enableEarlyIfConversion()233 bool enableEarlyIfConversion() const override { return hasISEL(); } 234 235 // Scheduling customization. 236 bool enableMachineScheduler() const override; 237 void overrideSchedPolicy(MachineSchedPolicy &Policy, 238 MachineInstr *begin, 239 MachineInstr *end, 240 unsigned NumRegionInstrs) const override; 241 bool useAA() const override; 242 }; 243 } // End llvm namespace 244 245 #endif 246