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"
26 class X86Subtarget : public TargetSubtarget {
28 enum AsmWriterFlavorTy {
34 NoMMXSSE, MMX, SSE1, SSE2, SSE3
38 NoThreeDNow, ThreeDNow, ThreeDNowA
41 /// AsmFlavor - Which x86 asm dialect to use.
42 AsmWriterFlavorTy AsmFlavor;
44 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, or none supported.
45 X86SSEEnum X86SSELevel;
47 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
48 X863DNowEnum X863DNowLevel;
50 /// HasX86_64 - True if the processor supports X86-64 instructions.
53 /// stackAlignment - The minimum alignment known to hold of the stack frame on
54 /// entry to the function and which must be maintained by every function.
55 unsigned stackAlignment;
57 /// Min. memset / memcpy size that is turned into rep/movs, rep/stos ops.
58 unsigned MinRepStrSizeThreshold;
61 /// Is64Bit - True if the processor supports 64-bit instructions and module
62 /// pointer size is 64 bit.
67 isELF, isCygwin, isDarwin, isWindows
70 /// This constructor initializes the data members to match that
71 /// of the specified module.
73 X86Subtarget(const Module &M, const std::string &FS, bool is64Bit);
75 /// getStackAlignment - Returns the minimum alignment known to hold of the
76 /// stack frame on entry to the function and which must be maintained by every
77 /// function for this subtarget.
78 unsigned getStackAlignment() const { return stackAlignment; }
80 /// getMinRepStrSizeThreshold - Returns the minimum memset / memcpy size
81 /// required to turn the operation into a X86 rep/movs or rep/stos
82 /// instruction. This is only used if the src / dst alignment is not DWORD
84 unsigned getMinRepStrSizeThreshold() const { return MinRepStrSizeThreshold; }
86 /// ParseSubtargetFeatures - Parses features string setting specified
87 /// subtarget options. Definition of function is auto generated by tblgen.
88 void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
90 /// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
92 void AutoDetectSubtargetFeatures();
94 bool is64Bit() const { return Is64Bit; }
96 bool hasMMX() const { return X86SSELevel >= MMX; }
97 bool hasSSE1() const { return X86SSELevel >= SSE1; }
98 bool hasSSE2() const { return X86SSELevel >= SSE2; }
99 bool hasSSE3() const { return X86SSELevel >= SSE3; }
100 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
101 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
103 bool isFlavorAtt() const { return AsmFlavor == att; }
104 bool isFlavorIntel() const { return AsmFlavor == intel; }
106 bool isTargetDarwin() const { return TargetType == isDarwin; }
107 bool isTargetELF() const { return TargetType == isELF; }
108 bool isTargetWindows() const { return TargetType == isWindows; }
109 bool isTargetCygwin() const { return TargetType == isCygwin; }
111 /// True if accessing the GV requires an extra load. For Windows, dllimported
112 /// symbols are indirect, loading the value at address GV rather then the
113 /// value of GV itself. This means that the GlobalAddress must be in the base
114 /// or index register of the address, not the GV offset field.
115 bool GVRequiresExtraLoad(const GlobalValue* GV, const TargetMachine& TM,
116 bool isDirectCall) const;
121 /// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in
122 /// the specified arguments. If we can't run cpuid on the host, return true.
123 bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX,
124 unsigned *rECX, unsigned *rEDX);
127 } // End llvm namespace