X86Subtarget.h revision ba6867d0ce3de9b7b4385f98d215edfcd36c4b32
1//===-- X86Subtarget.h - Define Subtarget for the X86 ----------*- 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 X86 specific subclass of TargetSubtargetInfo. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef X86SUBTARGET_H 15#define X86SUBTARGET_H 16 17#include "llvm/ADT/Triple.h" 18#include "llvm/IR/CallingConv.h" 19#include "llvm/Target/TargetSubtargetInfo.h" 20#include <string> 21 22#define GET_SUBTARGETINFO_HEADER 23#include "X86GenSubtargetInfo.inc" 24 25namespace llvm { 26class GlobalValue; 27class StringRef; 28class TargetMachine; 29 30/// PICStyles - The X86 backend supports a number of different styles of PIC. 31/// 32namespace PICStyles { 33enum Style { 34 StubPIC, // Used on i386-darwin in -fPIC mode. 35 StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode. 36 GOT, // Used on many 32-bit unices in -fPIC mode. 37 RIPRel, // Used on X86-64 when not in -static mode. 38 None // Set when in -static mode (not PIC or DynamicNoPIC mode). 39}; 40} 41 42class X86Subtarget : public X86GenSubtargetInfo { 43protected: 44 enum X86SSEEnum { 45 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, AVX, AVX2 46 }; 47 48 enum X863DNowEnum { 49 NoThreeDNow, ThreeDNow, ThreeDNowA 50 }; 51 52 enum X86ProcFamilyEnum { 53 Others, IntelAtom 54 }; 55 56 /// X86ProcFamily - X86 processor family: Intel Atom, and others 57 X86ProcFamilyEnum X86ProcFamily; 58 59 /// PICStyle - Which PIC style to use 60 /// 61 PICStyles::Style PICStyle; 62 63 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or 64 /// none supported. 65 X86SSEEnum X86SSELevel; 66 67 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported. 68 /// 69 X863DNowEnum X863DNowLevel; 70 71 /// HasCMov - True if this processor has conditional move instructions 72 /// (generally pentium pro+). 73 bool HasCMov; 74 75 /// HasX86_64 - True if the processor supports X86-64 instructions. 76 /// 77 bool HasX86_64; 78 79 /// HasPOPCNT - True if the processor supports POPCNT. 80 bool HasPOPCNT; 81 82 /// HasSSE4A - True if the processor supports SSE4A instructions. 83 bool HasSSE4A; 84 85 /// HasAES - Target has AES instructions 86 bool HasAES; 87 88 /// HasPCLMUL - Target has carry-less multiplication 89 bool HasPCLMUL; 90 91 /// HasFMA - Target has 3-operand fused multiply-add 92 bool HasFMA; 93 94 /// HasFMA4 - Target has 4-operand fused multiply-add 95 bool HasFMA4; 96 97 /// HasXOP - Target has XOP instructions 98 bool HasXOP; 99 100 /// HasMOVBE - True if the processor has the MOVBE instruction. 101 bool HasMOVBE; 102 103 /// HasRDRAND - True if the processor has the RDRAND instruction. 104 bool HasRDRAND; 105 106 /// HasF16C - Processor has 16-bit floating point conversion instructions. 107 bool HasF16C; 108 109 /// HasFSGSBase - Processor has FS/GS base insturctions. 110 bool HasFSGSBase; 111 112 /// HasLZCNT - Processor has LZCNT instruction. 113 bool HasLZCNT; 114 115 /// HasBMI - Processor has BMI1 instructions. 116 bool HasBMI; 117 118 /// HasBMI2 - Processor has BMI2 instructions. 119 bool HasBMI2; 120 121 /// HasRTM - Processor has RTM instructions. 122 bool HasRTM; 123 124 /// HasADX - Processor has ADX instructions. 125 bool HasADX; 126 127 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow. 128 bool IsBTMemSlow; 129 130 /// IsUAMemFast - True if unaligned memory access is fast. 131 bool IsUAMemFast; 132 133 /// HasVectorUAMem - True if SIMD operations can have unaligned memory 134 /// operands. This may require setting a feature bit in the processor. 135 bool HasVectorUAMem; 136 137 /// HasCmpxchg16b - True if this processor has the CMPXCHG16B instruction; 138 /// this is true for most x86-64 chips, but not the first AMD chips. 139 bool HasCmpxchg16b; 140 141 /// UseLeaForSP - True if the LEA instruction should be used for adjusting 142 /// the stack pointer. This is an optimization for Intel Atom processors. 143 bool UseLeaForSP; 144 145 /// HasSlowDivide - True if smaller divides are significantly faster than 146 /// full divides and should be used when possible. 147 bool HasSlowDivide; 148 149 /// PostRAScheduler - True if using post-register-allocation scheduler. 150 bool PostRAScheduler; 151 152 /// PadShortFunctions - True if the short functions should be padded to prevent 153 /// a stall when returning too early. 154 bool PadShortFunctions; 155 156 /// stackAlignment - The minimum alignment known to hold of the stack frame on 157 /// entry to the function and which must be maintained by every function. 158 unsigned stackAlignment; 159 160 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops. 161 /// 162 unsigned MaxInlineSizeThreshold; 163 164 /// TargetTriple - What processor and OS we're targeting. 165 Triple TargetTriple; 166 167 /// Instruction itineraries for scheduling 168 InstrItineraryData InstrItins; 169 170private: 171 /// StackAlignOverride - Override the stack alignment. 172 unsigned StackAlignOverride; 173 174 /// In64BitMode - True if compiling for 64-bit, false for 32-bit. 175 bool In64BitMode; 176 177public: 178 /// This constructor initializes the data members to match that 179 /// of the specified triple. 180 /// 181 X86Subtarget(const std::string &TT, const std::string &CPU, 182 const std::string &FS, 183 unsigned StackAlignOverride, bool is64Bit); 184 185 /// getStackAlignment - Returns the minimum alignment known to hold of the 186 /// stack frame on entry to the function and which must be maintained by every 187 /// function for this subtarget. 188 unsigned getStackAlignment() const { return stackAlignment; } 189 190 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size 191 /// that still makes it profitable to inline the call. 192 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; } 193 194 /// ParseSubtargetFeatures - Parses features string setting specified 195 /// subtarget options. Definition of function is auto generated by tblgen. 196 void ParseSubtargetFeatures(StringRef CPU, StringRef FS); 197 198 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID 199 /// instruction. 200 void AutoDetectSubtargetFeatures(); 201 202 /// \brief Reset the features for the X86 target. 203 virtual void resetSubtargetFeatures(const MachineFunction *MF); 204 void resetSubtargetFeatures(StringRef CPU, StringRef FS); 205 206 /// Is this x86_64? (disregarding specific ABI / programming model) 207 bool is64Bit() const { 208 return In64BitMode; 209 } 210 211 /// Is this x86_64 with the ILP32 programming model (x32 ABI)? 212 bool isTarget64BitILP32() const { 213 return In64BitMode && (TargetTriple.getEnvironment() == Triple::GNUX32); 214 } 215 216 /// Is this x86_64 with the LP64 programming model (standard AMD64, no x32)? 217 bool isTarget64BitLP64() const { 218 return In64BitMode && (TargetTriple.getEnvironment() != Triple::GNUX32); 219 } 220 221 PICStyles::Style getPICStyle() const { return PICStyle; } 222 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; } 223 224 bool hasCMov() const { return HasCMov; } 225 bool hasMMX() const { return X86SSELevel >= MMX; } 226 bool hasSSE1() const { return X86SSELevel >= SSE1; } 227 bool hasSSE2() const { return X86SSELevel >= SSE2; } 228 bool hasSSE3() const { return X86SSELevel >= SSE3; } 229 bool hasSSSE3() const { return X86SSELevel >= SSSE3; } 230 bool hasSSE41() const { return X86SSELevel >= SSE41; } 231 bool hasSSE42() const { return X86SSELevel >= SSE42; } 232 bool hasAVX() const { return X86SSELevel >= AVX; } 233 bool hasAVX2() const { return X86SSELevel >= AVX2; } 234 bool hasFp256() const { return hasAVX(); } 235 bool hasInt256() const { return hasAVX2(); } 236 bool hasSSE4A() const { return HasSSE4A; } 237 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; } 238 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; } 239 bool hasPOPCNT() const { return HasPOPCNT; } 240 bool hasAES() const { return HasAES; } 241 bool hasPCLMUL() const { return HasPCLMUL; } 242 bool hasFMA() const { return HasFMA; } 243 // FIXME: Favor FMA when both are enabled. Is this the right thing to do? 244 bool hasFMA4() const { return HasFMA4 && !HasFMA; } 245 bool hasXOP() const { return HasXOP; } 246 bool hasMOVBE() const { return HasMOVBE; } 247 bool hasRDRAND() const { return HasRDRAND; } 248 bool hasF16C() const { return HasF16C; } 249 bool hasFSGSBase() const { return HasFSGSBase; } 250 bool hasLZCNT() const { return HasLZCNT; } 251 bool hasBMI() const { return HasBMI; } 252 bool hasBMI2() const { return HasBMI2; } 253 bool hasRTM() const { return HasRTM; } 254 bool hasADX() const { return HasADX; } 255 bool isBTMemSlow() const { return IsBTMemSlow; } 256 bool isUnalignedMemAccessFast() const { return IsUAMemFast; } 257 bool hasVectorUAMem() const { return HasVectorUAMem; } 258 bool hasCmpxchg16b() const { return HasCmpxchg16b; } 259 bool useLeaForSP() const { return UseLeaForSP; } 260 bool hasSlowDivide() const { return HasSlowDivide; } 261 bool padShortFunctions() const { return PadShortFunctions; } 262 263 bool isAtom() const { return X86ProcFamily == IntelAtom; } 264 265 const Triple &getTargetTriple() const { return TargetTriple; } 266 267 bool isTargetDarwin() const { return TargetTriple.isOSDarwin(); } 268 bool isTargetFreeBSD() const { 269 return TargetTriple.getOS() == Triple::FreeBSD; 270 } 271 bool isTargetSolaris() const { 272 return TargetTriple.getOS() == Triple::Solaris; 273 } 274 bool isTargetELF() const { 275 return (TargetTriple.getEnvironment() == Triple::ELF || 276 TargetTriple.isOSBinFormatELF()); 277 } 278 bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; } 279 bool isTargetNaCl() const { 280 return TargetTriple.getOS() == Triple::NaCl; 281 } 282 bool isTargetNaCl32() const { return isTargetNaCl() && !is64Bit(); } 283 bool isTargetNaCl64() const { return isTargetNaCl() && is64Bit(); } 284 bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; } 285 bool isTargetMingw() const { return TargetTriple.getOS() == Triple::MinGW32; } 286 bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; } 287 bool isTargetCygMing() const { return TargetTriple.isOSCygMing(); } 288 bool isTargetCOFF() const { 289 return (TargetTriple.getEnvironment() != Triple::ELF && 290 TargetTriple.isOSBinFormatCOFF()); 291 } 292 bool isTargetEnvMacho() const { return TargetTriple.isEnvironmentMachO(); } 293 294 bool isTargetWin64() const { 295 // FIXME: x86_64-cygwin has not been released yet. 296 return In64BitMode && TargetTriple.isOSWindows(); 297 } 298 299 bool isTargetWin32() const { 300 // FIXME: Cygwin is included for isTargetWin64 -- should it be included 301 // here too? 302 return !In64BitMode && (isTargetMingw() || isTargetWindows()); 303 } 304 305 bool isPICStyleSet() const { return PICStyle != PICStyles::None; } 306 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; } 307 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; } 308 309 bool isPICStyleStubPIC() const { 310 return PICStyle == PICStyles::StubPIC; 311 } 312 313 bool isPICStyleStubNoDynamic() const { 314 return PICStyle == PICStyles::StubDynamicNoPIC; 315 } 316 bool isPICStyleStubAny() const { 317 return PICStyle == PICStyles::StubDynamicNoPIC || 318 PICStyle == PICStyles::StubPIC; } 319 320 /// ClassifyGlobalReference - Classify a global variable reference for the 321 /// current subtarget according to how we should reference it in a non-pcrel 322 /// context. 323 unsigned char ClassifyGlobalReference(const GlobalValue *GV, 324 const TargetMachine &TM)const; 325 326 /// ClassifyBlockAddressReference - Classify a blockaddress reference for the 327 /// current subtarget according to how we should reference it in a non-pcrel 328 /// context. 329 unsigned char ClassifyBlockAddressReference() const; 330 331 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls 332 /// to immediate address. 333 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const; 334 335 /// This function returns the name of a function which has an interface 336 /// like the non-standard bzero function, if such a function exists on 337 /// the current subtarget and it is considered prefereable over 338 /// memset with zero passed as the second argument. Otherwise it 339 /// returns null. 340 const char *getBZeroEntry() const; 341 342 /// This function returns true if the target has sincos() routine in its 343 /// compiler runtime or math libraries. 344 bool hasSinCos() const; 345 346 /// enablePostRAScheduler - run for Atom optimization. 347 bool enablePostRAScheduler(CodeGenOpt::Level OptLevel, 348 TargetSubtargetInfo::AntiDepBreakMode& Mode, 349 RegClassVector& CriticalPathRCs) const; 350 351 bool postRAScheduler() const { return PostRAScheduler; } 352 353 /// getInstrItins = Return the instruction itineraries based on the 354 /// subtarget selection. 355 const InstrItineraryData &getInstrItineraryData() const { return InstrItins; } 356}; 357 358} // End llvm namespace 359 360#endif 361