X86InstrFMA3Info.cpp
6.21 KB
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
//===-- X86InstrFMA3Info.cpp - X86 FMA3 Instruction Information -----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the implementation of the classes providing information
// about existing X86 FMA3 opcodes, classifying and grouping them.
//
//===----------------------------------------------------------------------===//
#include "X86InstrFMA3Info.h"
#include "X86InstrInfo.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/Threading.h"
#include <cassert>
#include <cstdint>
using namespace llvm;
#define FMA3GROUP(Name, Suf, Attrs) \
{ { X86::Name##132##Suf, X86::Name##213##Suf, X86::Name##231##Suf }, Attrs },
#define FMA3GROUP_MASKED(Name, Suf, Attrs) \
FMA3GROUP(Name, Suf, Attrs) \
FMA3GROUP(Name, Suf##k, Attrs | X86InstrFMA3Group::KMergeMasked) \
FMA3GROUP(Name, Suf##kz, Attrs | X86InstrFMA3Group::KZeroMasked)
#define FMA3GROUP_PACKED_WIDTHS(Name, Suf, Attrs) \
FMA3GROUP(Name, Suf##Ym, Attrs) \
FMA3GROUP(Name, Suf##Yr, Attrs) \
FMA3GROUP_MASKED(Name, Suf##Z128m, Attrs) \
FMA3GROUP_MASKED(Name, Suf##Z128r, Attrs) \
FMA3GROUP_MASKED(Name, Suf##Z256m, Attrs) \
FMA3GROUP_MASKED(Name, Suf##Z256r, Attrs) \
FMA3GROUP_MASKED(Name, Suf##Zm, Attrs) \
FMA3GROUP_MASKED(Name, Suf##Zr, Attrs) \
FMA3GROUP(Name, Suf##m, Attrs) \
FMA3GROUP(Name, Suf##r, Attrs)
#define FMA3GROUP_PACKED(Name, Attrs) \
FMA3GROUP_PACKED_WIDTHS(Name, PD, Attrs) \
FMA3GROUP_PACKED_WIDTHS(Name, PS, Attrs)
#define FMA3GROUP_SCALAR_WIDTHS(Name, Suf, Attrs) \
FMA3GROUP(Name, Suf##Zm, Attrs) \
FMA3GROUP_MASKED(Name, Suf##Zm_Int, Attrs | X86InstrFMA3Group::Intrinsic) \
FMA3GROUP(Name, Suf##Zr, Attrs) \
FMA3GROUP_MASKED(Name, Suf##Zr_Int, Attrs | X86InstrFMA3Group::Intrinsic) \
FMA3GROUP(Name, Suf##m, Attrs) \
FMA3GROUP(Name, Suf##m_Int, Attrs | X86InstrFMA3Group::Intrinsic) \
FMA3GROUP(Name, Suf##r, Attrs) \
FMA3GROUP(Name, Suf##r_Int, Attrs | X86InstrFMA3Group::Intrinsic)
#define FMA3GROUP_SCALAR(Name, Attrs) \
FMA3GROUP_SCALAR_WIDTHS(Name, SD, Attrs) \
FMA3GROUP_SCALAR_WIDTHS(Name, SS, Attrs)
#define FMA3GROUP_FULL(Name, Attrs) \
FMA3GROUP_PACKED(Name, Attrs) \
FMA3GROUP_SCALAR(Name, Attrs)
static const X86InstrFMA3Group Groups[] = {
FMA3GROUP_FULL(VFMADD, 0)
FMA3GROUP_PACKED(VFMADDSUB, 0)
FMA3GROUP_FULL(VFMSUB, 0)
FMA3GROUP_PACKED(VFMSUBADD, 0)
FMA3GROUP_FULL(VFNMADD, 0)
FMA3GROUP_FULL(VFNMSUB, 0)
};
#define FMA3GROUP_PACKED_AVX512_WIDTHS(Name, Type, Suf, Attrs) \
FMA3GROUP_MASKED(Name, Type##Z128##Suf, Attrs) \
FMA3GROUP_MASKED(Name, Type##Z256##Suf, Attrs) \
FMA3GROUP_MASKED(Name, Type##Z##Suf, Attrs)
#define FMA3GROUP_PACKED_AVX512(Name, Suf, Attrs) \
FMA3GROUP_PACKED_AVX512_WIDTHS(Name, PD, Suf, Attrs) \
FMA3GROUP_PACKED_AVX512_WIDTHS(Name, PS, Suf, Attrs)
#define FMA3GROUP_PACKED_AVX512_ROUND(Name, Suf, Attrs) \
FMA3GROUP_MASKED(Name, PDZ##Suf, Attrs) \
FMA3GROUP_MASKED(Name, PSZ##Suf, Attrs)
#define FMA3GROUP_SCALAR_AVX512_ROUND(Name, Suf, Attrs) \
FMA3GROUP(Name, SDZ##Suf, Attrs) \
FMA3GROUP_MASKED(Name, SDZ##Suf##_Int, Attrs) \
FMA3GROUP(Name, SSZ##Suf, Attrs) \
FMA3GROUP_MASKED(Name, SSZ##Suf##_Int, Attrs)
static const X86InstrFMA3Group BroadcastGroups[] = {
FMA3GROUP_PACKED_AVX512(VFMADD, mb, 0)
FMA3GROUP_PACKED_AVX512(VFMADDSUB, mb, 0)
FMA3GROUP_PACKED_AVX512(VFMSUB, mb, 0)
FMA3GROUP_PACKED_AVX512(VFMSUBADD, mb, 0)
FMA3GROUP_PACKED_AVX512(VFNMADD, mb, 0)
FMA3GROUP_PACKED_AVX512(VFNMSUB, mb, 0)
};
static const X86InstrFMA3Group RoundGroups[] = {
FMA3GROUP_PACKED_AVX512_ROUND(VFMADD, rb, 0)
FMA3GROUP_SCALAR_AVX512_ROUND(VFMADD, rb, X86InstrFMA3Group::Intrinsic)
FMA3GROUP_PACKED_AVX512_ROUND(VFMADDSUB, rb, 0)
FMA3GROUP_PACKED_AVX512_ROUND(VFMSUB, rb, 0)
FMA3GROUP_SCALAR_AVX512_ROUND(VFMSUB, rb, X86InstrFMA3Group::Intrinsic)
FMA3GROUP_PACKED_AVX512_ROUND(VFMSUBADD, rb, 0)
FMA3GROUP_PACKED_AVX512_ROUND(VFNMADD, rb, 0)
FMA3GROUP_SCALAR_AVX512_ROUND(VFNMADD, rb, X86InstrFMA3Group::Intrinsic)
FMA3GROUP_PACKED_AVX512_ROUND(VFNMSUB, rb, 0)
FMA3GROUP_SCALAR_AVX512_ROUND(VFNMSUB, rb, X86InstrFMA3Group::Intrinsic)
};
static void verifyTables() {
#ifndef NDEBUG
static std::atomic<bool> TableChecked(false);
if (!TableChecked.load(std::memory_order_relaxed)) {
assert(llvm::is_sorted(Groups) && llvm::is_sorted(RoundGroups) &&
llvm::is_sorted(BroadcastGroups) && "FMA3 tables not sorted!");
TableChecked.store(true, std::memory_order_relaxed);
}
#endif
}
/// Returns a reference to a group of FMA3 opcodes to where the given
/// \p Opcode is included. If the given \p Opcode is not recognized as FMA3
/// and not included into any FMA3 group, then nullptr is returned.
const X86InstrFMA3Group *llvm::getFMA3Group(unsigned Opcode, uint64_t TSFlags) {
// FMA3 instructions have a well defined encoding pattern we can exploit.
uint8_t BaseOpcode = X86II::getBaseOpcodeFor(TSFlags);
bool IsFMA3 = ((TSFlags & X86II::EncodingMask) == X86II::VEX ||
(TSFlags & X86II::EncodingMask) == X86II::EVEX) &&
(TSFlags & X86II::OpMapMask) == X86II::T8 &&
(TSFlags & X86II::OpPrefixMask) == X86II::PD &&
((BaseOpcode >= 0x96 && BaseOpcode <= 0x9F) ||
(BaseOpcode >= 0xA6 && BaseOpcode <= 0xAF) ||
(BaseOpcode >= 0xB6 && BaseOpcode <= 0xBF));
if (!IsFMA3)
return nullptr;
verifyTables();
ArrayRef<X86InstrFMA3Group> Table;
if (TSFlags & X86II::EVEX_RC)
Table = makeArrayRef(RoundGroups);
else if (TSFlags & X86II::EVEX_B)
Table = makeArrayRef(BroadcastGroups);
else
Table = makeArrayRef(Groups);
// FMA 132 instructions have an opcode of 0x96-0x9F
// FMA 213 instructions have an opcode of 0xA6-0xAF
// FMA 231 instructions have an opcode of 0xB6-0xBF
unsigned FormIndex = ((BaseOpcode - 0x90) >> 4) & 0x3;
auto I = partition_point(Table, [=](const X86InstrFMA3Group &Group) {
return Group.Opcodes[FormIndex] < Opcode;
});
assert(I != Table.end() && I->Opcodes[FormIndex] == Opcode &&
"Couldn't find FMA3 opcode!");
return I;
}