1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
|
//=====---- X86Subtarget.h - Define Subtarget for the X86 -----*- C++ -*--====//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Nate Begeman and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the X86 specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
#ifndef X86SUBTARGET_H
#define X86SUBTARGET_H
#include "llvm/Target/TargetSubtarget.h"
#include <string>
namespace llvm {
class Module;
class GlobalValue;
class X86Subtarget : public TargetSubtarget {
public:
enum AsmWriterFlavorTy {
att, intel, unset
};
protected:
enum X86SSEEnum {
NoMMXSSE, MMX, SSE1, SSE2, SSE3
};
enum X863DNowEnum {
NoThreeDNow, ThreeDNow, ThreeDNowA
};
/// AsmFlavor - Which x86 asm dialect to use.
AsmWriterFlavorTy AsmFlavor;
/// X86SSELevel - MMX, SSE1, SSE2, SSE3, or none supported.
X86SSEEnum X86SSELevel;
/// X863DNowLevel - 3DNow or 3DNow Athlon, or none supported.
X863DNowEnum X863DNowLevel;
/// HasX86_64 - True if the processor supports X86-64 instructions.
bool HasX86_64;
/// stackAlignment - The minimum alignment known to hold of the stack frame on
/// entry to the function and which must be maintained by every function.
unsigned stackAlignment;
/// Min. memset / memcpy size that is turned into rep/movs, rep/stos ops.
unsigned MinRepStrSizeThreshold;
private:
/// Is64Bit - True if the processor supports 64-bit instructions and module
/// pointer size is 64 bit.
bool Is64Bit;
public:
enum {
isELF, isCygwin, isDarwin, isWindows
} TargetType;
/// This constructor initializes the data members to match that
/// of the specified module.
///
X86Subtarget(const Module &M, const std::string &FS, bool is64Bit);
/// getStackAlignment - Returns the minimum alignment known to hold of the
/// stack frame on entry to the function and which must be maintained by every
/// function for this subtarget.
unsigned getStackAlignment() const { return stackAlignment; }
/// getMinRepStrSizeThreshold - Returns the minimum memset / memcpy size
/// required to turn the operation into a X86 rep/movs or rep/stos
/// instruction. This is only used if the src / dst alignment is not DWORD
/// aligned.
unsigned getMinRepStrSizeThreshold() const { return MinRepStrSizeThreshold; }
/// ParseSubtargetFeatures - Parses features string setting specified
/// subtarget options. Definition of function is auto generated by tblgen.
void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
/// AutoDetectSubtargetFeatures - Auto-detect CPU features using CPUID
/// instruction.
void AutoDetectSubtargetFeatures();
bool is64Bit() const { return Is64Bit; }
bool hasMMX() const { return X86SSELevel >= MMX; }
bool hasSSE1() const { return X86SSELevel >= SSE1; }
bool hasSSE2() const { return X86SSELevel >= SSE2; }
bool hasSSE3() const { return X86SSELevel >= SSE3; }
bool has3DNow() const { return X863DNowLevel >= ThreeDNow; }
bool has3DNowA() const { return X863DNowLevel >= ThreeDNowA; }
bool isFlavorAtt() const { return AsmFlavor == att; }
bool isFlavorIntel() const { return AsmFlavor == intel; }
bool isTargetDarwin() const { return TargetType == isDarwin; }
bool isTargetELF() const { return TargetType == isELF; }
bool isTargetWindows() const { return TargetType == isWindows; }
bool isTargetCygwin() const { return TargetType == isCygwin; }
/// True if accessing the GV requires an extra load. For Windows, dllimported
/// symbols are indirect, loading the value at address GV rather then the
/// value of GV itself. This means that the GlobalAddress must be in the base
/// or index register of the address, not the GV offset field.
bool GVRequiresExtraLoad(const GlobalValue* GV, bool isDirectCall) const;
};
namespace X86 {
/// GetCpuIDAndInfo - Execute the specified cpuid and return the 4 values in
/// the specified arguments. If we can't run cpuid on the host, return true.
bool GetCpuIDAndInfo(unsigned value, unsigned *rEAX, unsigned *rEBX,
unsigned *rECX, unsigned *rEDX);
}
} // End llvm namespace
#endif
|
