X86Subtarget.h revision 848113833fc51bdd170cdce17abe7783ca52a34a
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/Target/TargetSubtarget.h" 18#include <string> 19 20namespace llvm { 21class GlobalValue; 22class TargetMachine; 23 24/// PICStyles - The X86 backend supports a number of different styles of PIC. 25/// 26namespace PICStyles { 27enum Style { 28 StubPIC, // Used on i386-darwin in -fPIC mode. 29 StubDynamicNoPIC, // Used on i386-darwin in -mdynamic-no-pic mode. 30 GOT, // Used on many 32-bit unices in -fPIC mode. 31 RIPRel, // Used on X86-64 when not in -static mode. 32 None // Set when in -static mode (not PIC or DynamicNoPIC mode). 33}; 34} 35 36class X86Subtarget : public TargetSubtarget { 37protected: 38 enum X86SSEEnum { 39 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42 40 }; 41 42 enum X863DNowEnum { 43 NoThreeDNow, ThreeDNow, ThreeDNowA 44 }; 45 46 /// PICStyle - Which PIC style to use 47 /// 48 PICStyles::Style PICStyle; 49 50 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, SSE41, SSE42, or 51 /// none supported. 52 X86SSEEnum X86SSELevel; 53 54 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported. 55 /// 56 X863DNowEnum X863DNowLevel; 57 58 /// HasCMov - True if this processor has conditional move instructions 59 /// (generally pentium pro+). 60 bool HasCMov; 61 62 /// HasX86_64 - True if the processor supports X86-64 instructions. 63 /// 64 bool HasX86_64; 65 66 /// HasSSE4A - True if the processor supports SSE4A instructions. 67 bool HasSSE4A; 68 69 /// HasAVX - Target has AVX instructions 70 bool HasAVX; 71 72 /// HasFMA3 - Target has 3-operand fused multiply-add 73 bool HasFMA3; 74 75 /// HasFMA4 - Target has 4-operand fused multiply-add 76 bool HasFMA4; 77 78 /// IsBTMemSlow - True if BT (bit test) of memory instructions are slow. 79 bool IsBTMemSlow; 80 81 /// DarwinVers - Nonzero if this is a darwin platform: the numeric 82 /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc. 83 unsigned char DarwinVers; // Is any darwin-x86 platform. 84 85 /// isLinux - true if this is a "linux" platform. 86 bool IsLinux; 87 88 /// stackAlignment - The minimum alignment known to hold of the stack frame on 89 /// entry to the function and which must be maintained by every function. 90 unsigned stackAlignment; 91 92 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops. 93 /// 94 unsigned MaxInlineSizeThreshold; 95 96private: 97 /// Is64Bit - True if the processor supports 64-bit instructions and 98 /// pointer size is 64 bit. 99 bool Is64Bit; 100 101public: 102 enum { 103 isELF, isCygwin, isDarwin, isWindows, isMingw 104 } TargetType; 105 106 /// This constructor initializes the data members to match that 107 /// of the specified triple. 108 /// 109 X86Subtarget(const std::string &TT, const std::string &FS, bool is64Bit); 110 111 /// getStackAlignment - Returns the minimum alignment known to hold of the 112 /// stack frame on entry to the function and which must be maintained by every 113 /// function for this subtarget. 114 unsigned getStackAlignment() const { return stackAlignment; } 115 116 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size 117 /// that still makes it profitable to inline the call. 118 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; } 119 120 /// ParseSubtargetFeatures - Parses features string setting specified 121 /// subtarget options. Definition of function is auto generated by tblgen. 122 std::string ParseSubtargetFeatures(const std::string &FS, 123 const std::string &CPU); 124 125 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID 126 /// instruction. 127 void AutoDetectSubtargetFeatures(); 128 129 bool is64Bit() const { return Is64Bit; } 130 131 PICStyles::Style getPICStyle() const { return PICStyle; } 132 void setPICStyle(PICStyles::Style Style) { PICStyle = Style; } 133 134 bool hasMMX() const { return X86SSELevel >= MMX; } 135 bool hasSSE1() const { return X86SSELevel >= SSE1; } 136 bool hasSSE2() const { return X86SSELevel >= SSE2; } 137 bool hasSSE3() const { return X86SSELevel >= SSE3; } 138 bool hasSSSE3() const { return X86SSELevel >= SSSE3; } 139 bool hasSSE41() const { return X86SSELevel >= SSE41; } 140 bool hasSSE42() const { return X86SSELevel >= SSE42; } 141 bool hasSSE4A() const { return HasSSE4A; } 142 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; } 143 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; } 144 bool hasAVX() const { return HasAVX; } 145 bool hasFMA3() const { return HasFMA3; } 146 bool hasFMA4() const { return HasFMA4; } 147 bool isBTMemSlow() const { return IsBTMemSlow; } 148 149 bool isTargetDarwin() const { return TargetType == isDarwin; } 150 bool isTargetELF() const { return TargetType == isELF; } 151 bool isTargetWindows() const { return TargetType == isWindows; } 152 bool isTargetMingw() const { return TargetType == isMingw; } 153 bool isTargetCygMing() const { 154 return TargetType == isMingw || TargetType == isCygwin; 155 } 156 bool isTargetCygwin() const { return TargetType == isCygwin; } 157 bool isTargetWin64() const { 158 return Is64Bit && (TargetType == isMingw || TargetType == isWindows); 159 } 160 161 std::string getDataLayout() const { 162 const char *p; 163 if (is64Bit()) 164 p = "e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128"; 165 else if (isTargetDarwin()) 166 p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128"; 167 else 168 p = "e-p:32:32-f64:32:64-i64:32:64-f80:32:32"; 169 return std::string(p); 170 } 171 172 bool isPICStyleSet() const { return PICStyle != PICStyles::None; } 173 bool isPICStyleGOT() const { return PICStyle == PICStyles::GOT; } 174 bool isPICStyleRIPRel() const { return PICStyle == PICStyles::RIPRel; } 175 176 bool isPICStyleStubPIC() const { 177 return PICStyle == PICStyles::StubPIC; 178 } 179 180 bool isPICStyleStubNoDynamic() const { 181 return PICStyle == PICStyles::StubDynamicNoPIC; 182 } 183 bool isPICStyleStubAny() const { 184 return PICStyle == PICStyles::StubDynamicNoPIC || 185 PICStyle == PICStyles::StubPIC; } 186 187 /// getDarwinVers - Return the darwin version number, 8 = Tiger, 9 = Leopard, 188 /// 10 = Snow Leopard, etc. 189 unsigned getDarwinVers() const { return DarwinVers; } 190 191 /// isLinux - Return true if the target is "Linux". 192 bool isLinux() const { return IsLinux; } 193 194 195 /// ClassifyGlobalReference - Classify a global variable reference for the 196 /// current subtarget according to how we should reference it in a non-pcrel 197 /// context. 198 unsigned char ClassifyGlobalReference(const GlobalValue *GV, 199 const TargetMachine &TM)const; 200 201 /// IsLegalToCallImmediateAddr - Return true if the subtarget allows calls 202 /// to immediate address. 203 bool IsLegalToCallImmediateAddr(const TargetMachine &TM) const; 204 205 /// This function returns the name of a function which has an interface 206 /// like the non-standard bzero function, if such a function exists on 207 /// the current subtarget and it is considered prefereable over 208 /// memset with zero passed as the second argument. Otherwise it 209 /// returns null. 210 const char *getBZeroEntry() const; 211 212 /// getSpecialAddressLatency - For targets where it is beneficial to 213 /// backschedule instructions that compute addresses, return a value 214 /// indicating the number of scheduling cycles of backscheduling that 215 /// should be attempted. 216 unsigned getSpecialAddressLatency() const; 217}; 218 219} // End llvm namespace 220 221#endif 222