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 LLVM_LIB_TARGET_POWERPC_PPCSUBTARGET_H 15 #define LLVM_LIB_TARGET_POWERPC_PPCSUBTARGET_H 16 17 #include "PPCFrameLowering.h" 18 #include "PPCISelLowering.h" 19 #include "PPCInstrInfo.h" 20 #include "llvm/ADT/Triple.h" 21 #include "llvm/CodeGen/SelectionDAGTargetInfo.h" 22 #include "llvm/IR/DataLayout.h" 23 #include "llvm/MC/MCInstrItineraries.h" 24 #include "llvm/Target/TargetSubtargetInfo.h" 25 #include <string> 26 27 #define GET_SUBTARGETINFO_HEADER 28 #include "PPCGenSubtargetInfo.inc" 29 30 // GCC #defines PPC on Linux but we use it as our namespace name 31 #undef PPC 32 33 namespace llvm { 34 class StringRef; 35 36 namespace PPC { 37 // -m directive values. 38 enum { 39 DIR_NONE, 40 DIR_32, 41 DIR_440, 42 DIR_601, 43 DIR_602, 44 DIR_603, 45 DIR_7400, 46 DIR_750, 47 DIR_970, 48 DIR_A2, 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 UseSoftFloat; 95 bool IsPPC64; 96 bool HasAltivec; 97 bool HasSPE; 98 bool HasQPX; 99 bool HasVSX; 100 bool HasP8Vector; 101 bool HasP8Altivec; 102 bool HasP8Crypto; 103 bool HasP9Vector; 104 bool HasP9Altivec; 105 bool HasFCPSGN; 106 bool HasFSQRT; 107 bool HasFRE, HasFRES, HasFRSQRTE, HasFRSQRTES; 108 bool HasRecipPrec; 109 bool HasSTFIWX; 110 bool HasLFIWAX; 111 bool HasFPRND; 112 bool HasFPCVT; 113 bool HasISEL; 114 bool HasBPERMD; 115 bool HasExtDiv; 116 bool HasCMPB; 117 bool HasLDBRX; 118 bool IsBookE; 119 bool HasOnlyMSYNC; 120 bool IsE500; 121 bool IsPPC4xx; 122 bool IsPPC6xx; 123 bool FeatureMFTB; 124 bool DeprecatedDST; 125 bool HasLazyResolverStubs; 126 bool IsLittleEndian; 127 bool HasICBT; 128 bool HasInvariantFunctionDescriptors; 129 bool HasPartwordAtomics; 130 bool HasDirectMove; 131 bool HasHTM; 132 bool HasFusion; 133 bool HasFloat128; 134 bool IsISA3_0; 135 136 POPCNTDKind HasPOPCNTD; 137 138 /// When targeting QPX running a stock PPC64 Linux kernel where the stack 139 /// alignment has not been changed, we need to keep the 16-byte alignment 140 /// of the stack. 141 bool IsQPXStackUnaligned; 142 143 const PPCTargetMachine &TM; 144 PPCFrameLowering FrameLowering; 145 PPCInstrInfo InstrInfo; 146 PPCTargetLowering TLInfo; 147 SelectionDAGTargetInfo TSInfo; 148 149 public: 150 /// This constructor initializes the data members to match that 151 /// of the specified triple. 152 /// 153 PPCSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS, 154 const PPCTargetMachine &TM); 155 156 /// ParseSubtargetFeatures - Parses features string setting specified 157 /// subtarget options. Definition of function is auto generated by tblgen. 158 void ParseSubtargetFeatures(StringRef CPU, StringRef FS); 159 160 /// getStackAlignment - Returns the minimum alignment known to hold of the 161 /// stack frame on entry to the function and which must be maintained by every 162 /// function for this subtarget. getStackAlignment()163 unsigned getStackAlignment() const { return StackAlignment; } 164 165 /// getDarwinDirective - Returns the -m directive specified for the cpu. 166 /// getDarwinDirective()167 unsigned getDarwinDirective() const { return DarwinDirective; } 168 169 /// getInstrItins - Return the instruction itineraries based on subtarget 170 /// selection. getInstrItineraryData()171 const InstrItineraryData *getInstrItineraryData() const override { 172 return &InstrItins; 173 } 174 getFrameLowering()175 const PPCFrameLowering *getFrameLowering() const override { 176 return &FrameLowering; 177 } getInstrInfo()178 const PPCInstrInfo *getInstrInfo() const override { return &InstrInfo; } getTargetLowering()179 const PPCTargetLowering *getTargetLowering() const override { 180 return &TLInfo; 181 } getSelectionDAGInfo()182 const SelectionDAGTargetInfo *getSelectionDAGInfo() const override { 183 return &TSInfo; 184 } getRegisterInfo()185 const PPCRegisterInfo *getRegisterInfo() const override { 186 return &getInstrInfo()->getRegisterInfo(); 187 } getTargetMachine()188 const PPCTargetMachine &getTargetMachine() const { return TM; } 189 190 /// initializeSubtargetDependencies - Initializes using a CPU and feature string 191 /// so that we can use initializer lists for subtarget initialization. 192 PPCSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS); 193 194 private: 195 void initializeEnvironment(); 196 void initSubtargetFeatures(StringRef CPU, StringRef FS); 197 198 public: 199 /// isPPC64 - Return true if we are generating code for 64-bit pointer mode. 200 /// 201 bool isPPC64() const; 202 203 /// has64BitSupport - Return true if the selected CPU supports 64-bit 204 /// instructions, regardless of whether we are in 32-bit or 64-bit mode. has64BitSupport()205 bool has64BitSupport() const { return Has64BitSupport; } 206 // useSoftFloat - Return true if soft-float option is turned on. useSoftFloat()207 bool useSoftFloat() const { return UseSoftFloat; } 208 209 /// use64BitRegs - Return true if in 64-bit mode or if we should use 64-bit 210 /// registers in 32-bit mode when possible. This can only true if 211 /// has64BitSupport() returns true. use64BitRegs()212 bool use64BitRegs() const { return Use64BitRegs; } 213 214 /// useCRBits - Return true if we should store and manipulate i1 values in 215 /// the individual condition register bits. useCRBits()216 bool useCRBits() const { return UseCRBits; } 217 218 /// hasLazyResolverStub - Return true if accesses to the specified global have 219 /// to go through a dyld lazy resolution stub. This means that an extra load 220 /// is required to get the address of the global. 221 bool hasLazyResolverStub(const GlobalValue *GV) const; 222 223 // isLittleEndian - True if generating little-endian code isLittleEndian()224 bool isLittleEndian() const { return IsLittleEndian; } 225 226 // Specific obvious features. hasFCPSGN()227 bool hasFCPSGN() const { return HasFCPSGN; } hasFSQRT()228 bool hasFSQRT() const { return HasFSQRT; } hasFRE()229 bool hasFRE() const { return HasFRE; } hasFRES()230 bool hasFRES() const { return HasFRES; } hasFRSQRTE()231 bool hasFRSQRTE() const { return HasFRSQRTE; } hasFRSQRTES()232 bool hasFRSQRTES() const { return HasFRSQRTES; } hasRecipPrec()233 bool hasRecipPrec() const { return HasRecipPrec; } hasSTFIWX()234 bool hasSTFIWX() const { return HasSTFIWX; } hasLFIWAX()235 bool hasLFIWAX() const { return HasLFIWAX; } hasFPRND()236 bool hasFPRND() const { return HasFPRND; } hasFPCVT()237 bool hasFPCVT() const { return HasFPCVT; } hasAltivec()238 bool hasAltivec() const { return HasAltivec; } hasSPE()239 bool hasSPE() const { return HasSPE; } hasQPX()240 bool hasQPX() const { return HasQPX; } hasVSX()241 bool hasVSX() const { return HasVSX; } hasP8Vector()242 bool hasP8Vector() const { return HasP8Vector; } hasP8Altivec()243 bool hasP8Altivec() const { return HasP8Altivec; } hasP8Crypto()244 bool hasP8Crypto() const { return HasP8Crypto; } hasP9Vector()245 bool hasP9Vector() const { return HasP9Vector; } hasP9Altivec()246 bool hasP9Altivec() const { return HasP9Altivec; } hasMFOCRF()247 bool hasMFOCRF() const { return HasMFOCRF; } hasISEL()248 bool hasISEL() const { return HasISEL; } hasBPERMD()249 bool hasBPERMD() const { return HasBPERMD; } hasExtDiv()250 bool hasExtDiv() const { return HasExtDiv; } hasCMPB()251 bool hasCMPB() const { return HasCMPB; } hasLDBRX()252 bool hasLDBRX() const { return HasLDBRX; } isBookE()253 bool isBookE() const { return IsBookE; } hasOnlyMSYNC()254 bool hasOnlyMSYNC() const { return HasOnlyMSYNC; } isPPC4xx()255 bool isPPC4xx() const { return IsPPC4xx; } isPPC6xx()256 bool isPPC6xx() const { return IsPPC6xx; } isE500()257 bool isE500() const { return IsE500; } isFeatureMFTB()258 bool isFeatureMFTB() const { return FeatureMFTB; } isDeprecatedDST()259 bool isDeprecatedDST() const { return DeprecatedDST; } hasICBT()260 bool hasICBT() const { return HasICBT; } hasInvariantFunctionDescriptors()261 bool hasInvariantFunctionDescriptors() const { 262 return HasInvariantFunctionDescriptors; 263 } hasPartwordAtomics()264 bool hasPartwordAtomics() const { return HasPartwordAtomics; } hasDirectMove()265 bool hasDirectMove() const { return HasDirectMove; } 266 isQPXStackUnaligned()267 bool isQPXStackUnaligned() const { return IsQPXStackUnaligned; } getPlatformStackAlignment()268 unsigned getPlatformStackAlignment() const { 269 if ((hasQPX() || isBGQ()) && !isQPXStackUnaligned()) 270 return 32; 271 272 return 16; 273 } hasHTM()274 bool hasHTM() const { return HasHTM; } hasFusion()275 bool hasFusion() const { return HasFusion; } hasFloat128()276 bool hasFloat128() const { return HasFloat128; } isISA3_0()277 bool isISA3_0() const { return IsISA3_0; } 278 hasPOPCNTD()279 POPCNTDKind hasPOPCNTD() const { return HasPOPCNTD; } 280 getTargetTriple()281 const Triple &getTargetTriple() const { return TargetTriple; } 282 283 /// isDarwin - True if this is any darwin platform. isDarwin()284 bool isDarwin() const { return TargetTriple.isMacOSX(); } 285 /// isBGQ - True if this is a BG/Q platform. isBGQ()286 bool isBGQ() const { return TargetTriple.getVendor() == Triple::BGQ; } 287 isTargetELF()288 bool isTargetELF() const { return TargetTriple.isOSBinFormatELF(); } isTargetMachO()289 bool isTargetMachO() const { return TargetTriple.isOSBinFormatMachO(); } isTargetLinux()290 bool isTargetLinux() const { return TargetTriple.isOSLinux(); } 291 isDarwinABI()292 bool isDarwinABI() const { return isTargetMachO() || isDarwin(); } isSVR4ABI()293 bool isSVR4ABI() const { return !isDarwinABI(); } 294 bool isELFv2ABI() const; 295 enableEarlyIfConversion()296 bool enableEarlyIfConversion() const override { return hasISEL(); } 297 298 // Scheduling customization. 299 bool enableMachineScheduler() const override; 300 // This overrides the PostRAScheduler bit in the SchedModel for each CPU. 301 bool enablePostRAScheduler() const override; 302 AntiDepBreakMode getAntiDepBreakMode() const override; 303 void getCriticalPathRCs(RegClassVector &CriticalPathRCs) const override; 304 305 void overrideSchedPolicy(MachineSchedPolicy &Policy, 306 unsigned NumRegionInstrs) const override; 307 bool useAA() const override; 308 309 bool enableSubRegLiveness() const override; 310 311 /// classifyGlobalReference - Classify a global variable reference for the 312 /// current subtarget accourding to how we should reference it. 313 unsigned char classifyGlobalReference(const GlobalValue *GV) const; 314 }; 315 } // End llvm namespace 316 317 #endif 318