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 TargetSubtarget. 11 // 12 //===----------------------------------------------------------------------===// 13 14 #ifndef X86SUBTARGET_H 15 #define X86SUBTARGET_H 16 17 #include "llvm/ADT/Triple.h" 18 #include "llvm/Target/TargetSubtarget.h" 19 #include "llvm/CallingConv.h" 20 #include <string> 21 22 namespace llvm { 23 class GlobalValue; 24 class TargetMachine; 25 26 /// PICStyles - The X86 backend supports a number of different styles of PIC. 27 /// 28 namespace PICStyles { 29 enum Style { 30 StubPIC, // Used on i386-darwin in -fPIC mode. 31 StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode. 32 GOT, // Used on many 32-bit unices in -fPIC mode. 33 RIPRel, // Used on X86-64 when not in -static mode. 34 None // Set when in -static mode (not PIC or DynamicNoPIC mode). 35 }; 36 } 37 38 class X86Subtarget : public TargetSubtarget { 39 protected: 40 enum X86SSEEnum { 41 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42 42 }; 43 44 enum X863DNowEnum { 45 NoThreeDNow, ThreeDNow, ThreeDNowA 46 }; 47 48 /// PICStyle - Which PIC style to use 49 /// 50 PICStyles::Style PICStyle; 51 52 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or 53 /// none supported. 54 X86SSEEnum X86SSELevel; 55 56 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported. 57 /// 58 X863DNowEnum X863DNowLevel; 59 60 /// HasCMov - True if this processor has conditional move instructions 61 /// (generally pentium pro+). 62 bool HasCMov; 63 64 /// HasX86_64 - True if the processor supports X86-64 instructions. 65 /// 66 bool HasX86_64; 67 68 /// HasSSE4A - True if the processor supports SSE4A instructions. 69 bool HasSSE4A; 70 71 /// HasAVX - Target has AVX instructions 72 bool HasAVX; 73 74 /// HasAES - Target has AES instructions 75 bool HasAES; 76 77 /// HasCLMUL - Target has carry-less multiplication 78 bool HasCLMUL; 79 80 /// HasFMA3 - Target has 3-operand fused multiply-add 81 bool HasFMA3; 82 83 /// HasFMA4 - Target has 4-operand fused multiply-add 84 bool HasFMA4; 85 86 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow. 87 bool IsBTMemSlow; 88 89 /// IsUAMemFast - True if unaligned memory access is fast. 90 bool IsUAMemFast; 91 92 /// HasVectorUAMem - True if SIMD operations can have unaligned memory 93 /// operands. This may require setting a feature bit in the processor. 94 bool HasVectorUAMem; 95 96 /// stackAlignment - The minimum alignment known to hold of the stack frame on 97 /// entry to the function and which must be maintained by every function. 98 unsigned stackAlignment; 99 100 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops. 101 /// 102 unsigned MaxInlineSizeThreshold; 103 104 /// TargetTriple - What processor and OS we're targeting. 105 Triple TargetTriple; 106 107 private: 108 /// Is64Bit - True if the processor supports 64-bit instructions and 109 /// pointer size is 64 bit. 110 bool Is64Bit; 111 112 public: 113 114 /// This constructor initializes the data members to match that 115 /// of the specified triple. 116 /// 117 X86Subtarget(const std::string &TT, const std::string &FS, bool is64Bit); 118 119 /// getStackAlignment - Returns the minimum alignment known to hold of the 120 /// stack frame on entry to the function and which must be maintained by every 121 /// function for this subtarget. getStackAlignment()122 unsigned getStackAlignment() const { return stackAlignment; } 123 124 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size 125 /// that still makes it profitable to inline the call. getMaxInlineSizeThreshold()126 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; } 127 128 /// ParseSubtargetFeatures - Parses features string setting specified 129 /// subtarget options. Definition of function is auto generated by tblgen. 130 std::string ParseSubtargetFeatures(const std::string &FS, 131 const std::string &CPU); 132 133 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID 134 /// instruction. 135 void AutoDetectSubtargetFeatures(); 136 is64Bit()137 bool is64Bit() const { return Is64Bit; } 138 getPICStyle()139 PICStyles::Style getPICStyle() const { return PICStyle; } setPICStyle(PICStyles::Style Style)140 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; } 141 hasCMov()142 bool hasCMov() const { return HasCMov; } hasMMX()143 bool hasMMX() const { return X86SSELevel >= MMX; } hasSSE1()144 bool hasSSE1() const { return X86SSELevel >= SSE1; } hasSSE2()145 bool hasSSE2() const { return X86SSELevel >= SSE2; } hasSSE3()146 bool hasSSE3() const { return X86SSELevel >= SSE3; } hasSSSE3()147 bool hasSSSE3() const { return X86SSELevel >= SSSE3; } hasSSE41()148 bool hasSSE41() const { return X86SSELevel >= SSE41; } hasSSE42()149 bool hasSSE42() const { return X86SSELevel >= SSE42; } hasSSE4A()150 bool hasSSE4A() const { return HasSSE4A; } has3DNow()151 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; } has3DNowA()152 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; } hasAVX()153 bool hasAVX() const { return HasAVX; } hasAES()154 bool hasAES() const { return HasAES; } hasCLMUL()155 bool hasCLMUL() const { return HasCLMUL; } hasFMA3()156 bool hasFMA3() const { return HasFMA3; } hasFMA4()157 bool hasFMA4() const { return HasFMA4; } isBTMemSlow()158 bool isBTMemSlow() const { return IsBTMemSlow; } isUnalignedMemAccessFast()159 bool isUnalignedMemAccessFast() const { return IsUAMemFast; } hasVectorUAMem()160 bool hasVectorUAMem() const { return HasVectorUAMem; } 161 isTargetDarwin()162 bool isTargetDarwin() const { return TargetTriple.getOS() == Triple::Darwin; } 163 164 // ELF is a reasonably sane default and the only other X86 targets we 165 // support are Darwin and Windows. Just use "not those". isTargetELF()166 bool isTargetELF() const { 167 return !isTargetDarwin() && !isTargetWindows() && !isTargetCygMing(); 168 } isTargetLinux()169 bool isTargetLinux() const { return TargetTriple.getOS() == Triple::Linux; } 170 isTargetWindows()171 bool isTargetWindows() const { return TargetTriple.getOS() == Triple::Win32; } isTargetMingw()172 bool isTargetMingw() const { 173 return TargetTriple.getOS() == Triple::MinGW32 || 174 TargetTriple.getOS() == Triple::MinGW64; } isTargetCygwin()175 bool isTargetCygwin() const { return TargetTriple.getOS() == Triple::Cygwin; } isTargetCygMing()176 bool isTargetCygMing() const { 177 return isTargetMingw() || isTargetCygwin(); 178 } 179 180 /// isTargetCOFF - Return true if this is any COFF/Windows target variant. isTargetCOFF()181 bool isTargetCOFF() const { 182 return isTargetMingw() || isTargetCygwin() || isTargetWindows(); 183 } 184 isTargetWin64()185 bool isTargetWin64() const { 186 return Is64Bit && (isTargetMingw() || isTargetWindows()); 187 } 188 isTargetWin32()189 bool isTargetWin32() const { 190 return !Is64Bit && (isTargetMingw() || isTargetWindows()); 191 } 192 getDataLayout()193 std::string getDataLayout() const { 194 const char *p; 195 if (is64Bit()) 196 p = "e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128-n8:16:32:64"; 197 else if (isTargetDarwin()) 198 p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128-n8:16:32"; 199 else if (isTargetMingw() || isTargetWindows()) 200 p = "e-p:32:32-f64:64:64-i64:64:64-f80:32:32-n8:16:32"; 201 else 202 p = "e-p:32:32-f64:32:64-i64:32:64-f80:32:32-n8:16:32"; 203 204 return std::string(p); 205 } 206 isPICStyleSet()207 bool isPICStyleSet() const { return PICStyle != PICStyles::None; } isPICStyleGOT()208 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; } isPICStyleRIPRel()209 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; } 210 isPICStyleStubPIC()211 bool isPICStyleStubPIC() const { 212 return PICStyle == PICStyles::StubPIC; 213 } 214 isPICStyleStubNoDynamic()215 bool isPICStyleStubNoDynamic() const { 216 return PICStyle == PICStyles::StubDynamicNoPIC; 217 } isPICStyleStubAny()218 bool isPICStyleStubAny() const { 219 return PICStyle == PICStyles::StubDynamicNoPIC || 220 PICStyle == PICStyles::StubPIC; } 221 222 /// getDarwinVers - Return the darwin version number, 8 = Tiger, 9 = Leopard, 223 /// 10 = Snow Leopard, etc. getDarwinVers()224 unsigned getDarwinVers() const { 225 if (isTargetDarwin()) return TargetTriple.getDarwinMajorNumber(); 226 return 0; 227 } 228 229 /// ClassifyGlobalReference - Classify a global variable reference for the 230 /// current subtarget according to how we should reference it in a non-pcrel 231 /// context. 232 unsigned char ClassifyGlobalReference(const GlobalValue *GV, 233 const TargetMachine &TM)const; 234 235 /// ClassifyBlockAddressReference - Classify a blockaddress reference for the 236 /// current subtarget according to how we should reference it in a non-pcrel 237 /// context. 238 unsigned char ClassifyBlockAddressReference() const; 239 240 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls 241 /// to immediate address. 242 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const; 243 244 /// This function returns the name of a function which has an interface 245 /// like the non-standard bzero function, if such a function exists on 246 /// the current subtarget and it is considered prefereable over 247 /// memset with zero passed as the second argument. Otherwise it 248 /// returns null. 249 const char *getBZeroEntry() const; 250 251 /// getSpecialAddressLatency - For targets where it is beneficial to 252 /// backschedule instructions that compute addresses, return a value 253 /// indicating the number of scheduling cycles of backscheduling that 254 /// should be attempted. 255 unsigned getSpecialAddressLatency() const; 256 257 /// IsCalleePop - Test whether a function should pop its own arguments. 258 bool IsCalleePop(bool isVarArg, CallingConv::ID CallConv) const; 259 }; 260 261 } // End llvm namespace 262 263 #endif 264