1 //=====---- X86Subtarget.h - Define Subtarget for the X86 -----*- C++ -*--====//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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, SSE41, SSE42
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, SSE41, SSE42, or
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 /// DarwinVers - Nonzero if this is a darwin platform: the numeric
69 /// version of the platform, e.g. 8 = 10.4 (Tiger), 9 = 10.5 (Leopard), etc.
70 unsigned char DarwinVers; // Is any darwin-x86 platform.
72 /// isLinux - true if this is a "linux" platform.
75 /// stackAlignment - The minimum alignment known to hold of the stack frame on
76 /// entry to the function and which must be maintained by every function.
77 unsigned stackAlignment;
79 /// Max. memset / memcpy size that is turned into rep/movs, rep/stos ops.
81 unsigned MaxInlineSizeThreshold;
84 /// Is64Bit - True if the processor supports 64-bit instructions and module
85 /// pointer size is 64 bit.
90 isELF, isCygwin, isDarwin, isWindows, isMingw
93 /// This constructor initializes the data members to match that
94 /// of the specified module.
96 X86Subtarget(const Module &M, const std::string &FS, bool is64Bit);
98 /// getStackAlignment - Returns the minimum alignment known to hold of the
99 /// stack frame on entry to the function and which must be maintained by every
100 /// function for this subtarget.
101 unsigned getStackAlignment() const { return stackAlignment; }
103 /// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
104 /// that still makes it profitable to inline the call.
105 unsigned getMaxInlineSizeThreshold() const { return MaxInlineSizeThreshold; }
107 /// ParseSubtargetFeatures - Parses features string setting specified
108 /// subtarget options. Definition of function is auto generated by tblgen.
109 void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
111 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
113 void AutoDetectSubtargetFeatures();
115 bool is64Bit() const { return Is64Bit; }
117 PICStyle::Style getPICStyle() const { return PICStyle; }
118 void setPICStyle(PICStyle::Style Style) { PICStyle = Style; }
120 bool hasMMX() const { return X86SSELevel >= MMX; }
121 bool hasSSE1() const { return X86SSELevel >= SSE1; }
122 bool hasSSE2() const { return X86SSELevel >= SSE2; }
123 bool hasSSE3() const { return X86SSELevel >= SSE3; }
124 bool hasSSSE3() const { return X86SSELevel >= SSSE3; }
125 bool hasSSE41() const { return X86SSELevel >= SSE41; }
126 bool hasSSE42() const { return X86SSELevel >= SSE42; }
127 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
128 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
130 unsigned getAsmFlavor() const {
131 return AsmFlavor != Unset ? unsigned(AsmFlavor) : 0;
134 bool isFlavorAtt() const { return AsmFlavor == ATT; }
135 bool isFlavorIntel() const { return AsmFlavor == Intel; }
137 bool isTargetDarwin() const { return TargetType == isDarwin; }
138 bool isTargetELF() const {
139 return TargetType == isELF;
141 bool isTargetWindows() const { return TargetType == isWindows; }
142 bool isTargetMingw() const { return TargetType == isMingw; }
143 bool isTargetCygMing() const { return (TargetType == isMingw ||
144 TargetType == isCygwin); }
145 bool isTargetCygwin() const { return TargetType == isCygwin; }
146 bool isTargetWin64() const {
147 return (Is64Bit && (TargetType == isMingw || TargetType == isWindows));
150 std::string getDataLayout() const {
153 p = "e-p:64:64-s:64-f64:64:64-i64:64:64-f80:128:128";
155 if (isTargetDarwin())
156 p = "e-p:32:32-f64:32:64-i64:32:64-f80:128:128";
158 p = "e-p:32:32-f64:32:64-i64:32:64-f80:32:32";
160 return std::string(p);
163 bool isPICStyleSet() const { return PICStyle != PICStyle::None; }
164 bool isPICStyleGOT() const { return PICStyle == PICStyle::GOT; }
165 bool isPICStyleStub() const { return PICStyle == PICStyle::Stub; }
166 bool isPICStyleRIPRel() const { return PICStyle == PICStyle::RIPRel; }
167 bool isPICStyleWinPIC() const { return PICStyle == PICStyle:: WinPIC; }
169 /// getDarwinVers - Return the darwin version number, 8 = tiger, 9 = leopard.
170 unsigned getDarwinVers() const { return DarwinVers; }
172 /// isLinux - Return true if the target is "Linux".
173 bool isLinux() const { return IsLinux; }
175 /// True if accessing the GV requires an extra load. For Windows, dllimported
176 /// symbols are indirect, loading the value at address GV rather then the
177 /// value of GV itself. This means that the GlobalAddress must be in the base
178 /// or index register of the address, not the GV offset field.
179 bool GVRequiresExtraLoad(const GlobalValue* GV, const TargetMachine& TM,
180 bool isDirectCall) const;
182 /// This function returns the name of a function which has an interface
183 /// like the non-standard bzero function, if such a function exists on
184 /// the current subtarget and it is considered prefereable over
185 /// memset with zero passed as the second argument. Otherwise it
187 const char *getBZeroEntry() const;
191 /// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in
192 /// the specified arguments. If we can't run cpuid on the host, return true.
193 bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX,
194 unsigned *rECX, unsigned *rEDX);
197 } // End llvm namespace