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"
24 class X86Subtarget : public TargetSubtarget {
26 enum AsmWriterFlavorTy {
32 NoMMXSSE, MMX, SSE1, SSE2, SSE3
36 NoThreeDNow, ThreeDNow, ThreeDNowA
39 /// AsmFlavor - Which x86 asm dialect to use.
40 AsmWriterFlavorTy AsmFlavor;
42 /// X86SSELevel - MMX, SSE1, SSE2, SSE3, or none supported.
43 X86SSEEnum X86SSELevel;
45 /// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
46 X863DNowEnum X863DNowLevel;
48 /// HasX86_64 - True if the processor supports X86-64 instructions.
51 /// stackAlignment - The minimum alignment known to hold of the stack frame on
52 /// entry to the function and which must be maintained by every function.
53 unsigned stackAlignment;
55 /// Min. memset / memcpy size that is turned into rep/movs, rep/stos ops.
56 unsigned MinRepStrSizeThreshold;
59 /// Is64Bit - True if the processor supports 64-bit instructions and module
60 /// pointer size is 64 bit.
65 isELF, isCygwin, isDarwin, isWindows
68 /// This constructor initializes the data members to match that
69 /// of the specified module.
71 X86Subtarget(const Module &M, const std::string &FS, bool is64Bit);
73 /// getStackAlignment - Returns the minimum alignment known to hold of the
74 /// stack frame on entry to the function and which must be maintained by every
75 /// function for this subtarget.
76 unsigned getStackAlignment() const { return stackAlignment; }
78 /// getMinRepStrSizeThreshold - Returns the minimum memset / memcpy size
79 /// required to turn the operation into a X86 rep/movs or rep/stos
80 /// instruction. This is only used if the src / dst alignment is not DWORD
82 unsigned getMinRepStrSizeThreshold() const { return MinRepStrSizeThreshold; }
84 /// ParseSubtargetFeatures - Parses features string setting specified
85 /// subtarget options. Definition of function is auto generated by tblgen.
86 void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
88 bool is64Bit() const { return Is64Bit; }
90 bool hasMMX() const { return X86SSELevel >= MMX; }
91 bool hasSSE1() const { return X86SSELevel >= SSE1; }
92 bool hasSSE2() const { return X86SSELevel >= SSE2; }
93 bool hasSSE3() const { return X86SSELevel >= SSE3; }
94 bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
95 bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
97 bool isFlavorAtt() const { return AsmFlavor == att; }
98 bool isFlavorIntel() const { return AsmFlavor == intel; }
100 bool isTargetDarwin() const { return TargetType == isDarwin; }
101 bool isTargetELF() const { return TargetType == isELF; }
103 } // End llvm namespace