1 //=====---- X86Subtarget.h - Define Subtarget for the X86 -----*- C++ -*--====//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Nate Begeman and is distributed under the
6 // University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the X86 specific subclass of TargetSubtarget.
12 //===----------------------------------------------------------------------===//
14 #ifndef X86SUBTARGET_H
15 #define X86SUBTARGET_H
17 #include "llvm/Target/TargetSubtarget.h"
28 Stub, GOT, RIPRel, WinPIC, None
32 class X86Subtarget : public TargetSubtarget {
34 enum AsmWriterFlavorTy {
35 // Note: This numbering has to match the GCC assembler dialects for inline
36 // asm alternatives to work right.
37 ATT = 0, Intel = 1, Unset
41 NoMMXSSE, MMX, SSE1, SSE2, SSE3, SSSE3
45 NoThreeDNow, ThreeDNow, ThreeDNowA
48 /// AsmFlavor - Which x86 asm dialect to use.
50 AsmWriterFlavorTy AsmFlavor;
52 /// PICStyle - Which PIC style to use
54 PICStyle::Style PICStyle;
56 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, SSSE3, or none supported.
58 X86SSEEnum X86SSELevel;
60 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
62 X863DNowEnum X863DNowLevel;
64 /// HasX86_64 - True if the processor supports X86-64 instructions.
68 /// stackAlignment - The minimum alignment known to hold of the stack frame on
69 /// entry to the function and which must be maintained by every function.
70 unsigned stackAlignment;
72 /// Min. memset / memcpy size that is turned into rep/movs, rep/stos ops.
74 unsigned MinRepStrSizeThreshold;
77 /// Is64Bit - True if the processor supports 64-bit instructions and module
78 /// pointer size is 64 bit.
81 /// HasLow4GUserAddress - True if the low 4G user-space address is available.
83 bool HasLow4GUserAddress;
87 isELF, isCygwin, isDarwin, isWindows, isMingw
90 /// This constructor initializes the data members to match that
91 /// of the specified module.
93 X86Subtarget(const Module &M, const std::string &FS, bool is64Bit);
95 /// getStackAlignment - Returns the minimum alignment known to hold of the
96 /// stack frame on entry to the function and which must be maintained by every
97 /// function for this subtarget.
98 unsigned getStackAlignment() const { return stackAlignment; }
100 /// getMinRepStrSizeThreshold - Returns the minimum memset / memcpy size
101 /// required to turn the operation into a X86 rep/movs or rep/stos
102 /// instruction. This is only used if the src / dst alignment is not DWORD
104 unsigned getMinRepStrSizeThreshold() const { return MinRepStrSizeThreshold; }
106 /// ParseSubtargetFeatures - Parses features string setting specified
107 /// subtarget options. Definition of function is auto generated by tblgen.
108 void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
110 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
112 void AutoDetectSubtargetFeatures();
114 bool is64Bit() const { return Is64Bit; }
116 /// hasLow4GUserSpaceAddress - True if lower 4G user-space address is
118 bool hasLow4GUserSpaceAddress() const { return HasLow4GUserAddress; }
120 PICStyle::Style getPICStyle() const { return PICStyle; }
121 void setPICStyle(PICStyle::Style Style) { PICStyle = Style; }
123 bool hasMMX() const { return X86SSELevel >= MMX; }
124 bool hasSSE1() const { return X86SSELevel >= SSE1; }
125 bool hasSSE2() const { return X86SSELevel >= SSE2; }
126 bool hasSSE3() const { return X86SSELevel >= SSE3; }
127 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
128 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
129 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
131 unsigned getAsmFlavor() const {
132 return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
135 bool isFlavorAtt() const { return AsmFlavor == ATT; }
136 bool isFlavorIntel() const { return AsmFlavor == Intel; }
138 bool isTargetDarwin() const { return TargetType == isDarwin; }
139 bool isTargetELF() const { return TargetType == isELF; }
140 bool isTargetWindows() const { return TargetType == isWindows; }
141 bool isTargetMingw() const { return TargetType == isMingw; }
142 bool isTargetCygMing() const { return (TargetType == isMingw ||
143 TargetType == isCygwin); }
144 bool isTargetCygwin() const { return TargetType == isCygwin; }
146 std::string getDataLayout() const {
149 p = "e-p:64:64-f64:32:64-i64:32:64-f80:128:128";
150 else if (isTargetDarwin())
151 p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128";
153 p = "e-p:32:32-f64:32:64-i64:32:64-f80:32:32";
154 return std::string(p);
157 bool isPICStyleSet() const { return PICStyle != PICStyle::None; }
158 bool isPICStyleGOT() const { return PICStyle == PICStyle::GOT; }
159 bool isPICStyleStub() const { return PICStyle == PICStyle::Stub; }
160 bool isPICStyleRIPRel() const { return PICStyle == PICStyle::RIPRel; }
161 bool isPICStyleWinPIC() const { return PICStyle == PICStyle:: WinPIC; }
163 /// True if accessing the GV requires an extra load. For Windows, dllimported
164 /// symbols are indirect, loading the value at address GV rather then the
165 /// value of GV itself. This means that the GlobalAddress must be in the base
166 /// or index register of the address, not the GV offset field.
167 bool GVRequiresExtraLoad(const GlobalValue* GV, const TargetMachine& TM,
168 bool isDirectCall) const;
173 /// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in
174 /// the specified arguments. If we can't run cpuid on the host, return true.
175 bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX,
176 unsigned *rECX, unsigned *rEDX);
179 } // End llvm namespace