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
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
|
//=====---- ARMSubtarget.h - Define Subtarget for the ARM -----*- C++ -*--====//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the ARM specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
#ifndef ARMSUBTARGET_H
#define ARMSUBTARGET_H
#include "llvm/Target/TargetInstrItineraries.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetSubtarget.h"
#include "ARMBaseRegisterInfo.h"
#include <string>
namespace llvm {
class GlobalValue;
class ARMSubtarget : public TargetSubtarget {
protected:
enum ARMArchEnum {
V4, V4T, V5T, V5TE, V6, V6M, V6T2, V7A, V7M
};
enum ARMFPEnum {
None, VFPv2, VFPv3, NEON
};
enum ThumbTypeEnum {
Thumb1,
Thumb2
};
/// ARMArchVersion - ARM architecture version: V4, V4T (base), V5T, V5TE,
/// V6, V6T2, V7A, V7M.
ARMArchEnum ARMArchVersion;
/// ARMFPUType - Floating Point Unit type.
ARMFPEnum ARMFPUType;
/// UseNEONForSinglePrecisionFP - if the NEONFP attribute has been
/// specified. Use the method useNEONForSinglePrecisionFP() to
/// determine if NEON should actually be used.
bool UseNEONForSinglePrecisionFP;
/// SlowVMLx - If the VFP2 instructions are available, indicates whether
/// the VML[AS] instructions are slow (if so, don't use them).
bool SlowVMLx;
/// SlowFPBrcc - True if floating point compare + branch is slow.
bool SlowFPBrcc;
/// IsThumb - True if we are in thumb mode, false if in ARM mode.
bool IsThumb;
/// ThumbMode - Indicates supported Thumb version.
ThumbTypeEnum ThumbMode;
/// NoARM - True if subtarget does not support ARM mode execution.
bool NoARM;
/// PostRAScheduler - True if using post-register-allocation scheduler.
bool PostRAScheduler;
/// IsR9Reserved - True if R9 is a not available as general purpose register.
bool IsR9Reserved;
/// UseMovt - True if MOVT / MOVW pairs are used for materialization of 32-bit
/// imms (including global addresses).
bool UseMovt;
/// HasFP16 - True if subtarget supports half-precision FP (We support VFP+HF
/// only so far)
bool HasFP16;
/// HasHardwareDivide - True if subtarget supports [su]div
bool HasHardwareDivide;
/// HasT2ExtractPack - True if subtarget supports thumb2 extract/pack
/// instructions.
bool HasT2ExtractPack;
/// HasDataBarrier - True if the subtarget supports DMB / DSB data barrier
/// instructions.
bool HasDataBarrier;
/// Pref32BitThumb - If true, codegen would prefer 32-bit Thumb instructions
/// over 16-bit ones.
bool Pref32BitThumb;
/// FPOnlySP - If true, the floating point unit only supports single
/// precision.
bool FPOnlySP;
/// 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;
/// CPUString - String name of used CPU.
std::string CPUString;
/// Selected instruction itineraries (one entry per itinerary class.)
InstrItineraryData InstrItins;
public:
enum {
isELF, isDarwin
} TargetType;
enum {
ARM_ABI_APCS,
ARM_ABI_AAPCS // ARM EABI
} TargetABI;
/// This constructor initializes the data members to match that
/// of the specified triple.
///
ARMSubtarget(const std::string &TT, const std::string &FS, bool isThumb);
/// getMaxInlineSizeThreshold - Returns the maximum memset / memcpy size
/// that still makes it profitable to inline the call.
unsigned getMaxInlineSizeThreshold() const {
// FIXME: For now, we don't lower memcpy's to loads / stores for Thumb1.
// Change this once Thumb1 ldmia / stmia support is added.
return isThumb1Only() ? 0 : 64;
}
/// ParseSubtargetFeatures - Parses features string setting specified
/// subtarget options. Definition of function is auto generated by tblgen.
std::string ParseSubtargetFeatures(const std::string &FS,
const std::string &CPU);
bool hasV4TOps() const { return ARMArchVersion >= V4T; }
bool hasV5TOps() const { return ARMArchVersion >= V5T; }
bool hasV5TEOps() const { return ARMArchVersion >= V5TE; }
bool hasV6Ops() const { return ARMArchVersion >= V6; }
bool hasV6T2Ops() const { return ARMArchVersion >= V6T2; }
bool hasV7Ops() const { return ARMArchVersion >= V7A; }
bool hasARMOps() const { return !NoARM; }
bool hasVFP2() const { return ARMFPUType >= VFPv2; }
bool hasVFP3() const { return ARMFPUType >= VFPv3; }
bool hasNEON() const { return ARMFPUType >= NEON; }
bool useNEONForSinglePrecisionFP() const {
return hasNEON() && UseNEONForSinglePrecisionFP; }
bool hasDivide() const { return HasHardwareDivide; }
bool hasT2ExtractPack() const { return HasT2ExtractPack; }
bool hasDataBarrier() const { return HasDataBarrier; }
bool useVMLx() const {return hasVFP2() && !SlowVMLx; }
bool isFPBrccSlow() const { return SlowFPBrcc; }
bool isFPOnlySP() const { return FPOnlySP; }
bool prefers32BitThumb() const { return Pref32BitThumb; }
bool hasFP16() const { return HasFP16; }
bool isTargetDarwin() const { return TargetType == isDarwin; }
bool isTargetELF() const { return TargetType == isELF; }
bool isAPCS_ABI() const { return TargetABI == ARM_ABI_APCS; }
bool isAAPCS_ABI() const { return TargetABI == ARM_ABI_AAPCS; }
bool isThumb() const { return IsThumb; }
bool isThumb1Only() const { return IsThumb && (ThumbMode == Thumb1); }
bool isThumb2() const { return IsThumb && (ThumbMode == Thumb2); }
bool hasThumb2() const { return ThumbMode >= Thumb2; }
bool isR9Reserved() const { return IsR9Reserved; }
bool useMovt() const { return UseMovt && hasV6T2Ops(); }
const std::string & getCPUString() const { return CPUString; }
/// enablePostRAScheduler - True at 'More' optimization.
bool enablePostRAScheduler(CodeGenOpt::Level OptLevel,
TargetSubtarget::AntiDepBreakMode& Mode,
RegClassVector& CriticalPathRCs) const;
/// getInstrItins - Return the instruction itineraies based on subtarget
/// selection.
const InstrItineraryData &getInstrItineraryData() const { return InstrItins; }
/// 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; }
/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect
/// symbol.
bool GVIsIndirectSymbol(const GlobalValue *GV, Reloc::Model RelocM) const;
};
} // End llvm namespace
#endif // ARMSUBTARGET_H
|
