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
|
//===- SubtargetFeatureInfo.cpp - Helpers for subtarget features ----------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "SubtargetFeatureInfo.h"
#include "Types.h"
#include "llvm/Config/llvm-config.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include <map>
using namespace llvm;
#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
LLVM_DUMP_METHOD void SubtargetFeatureInfo::dump() const {
errs() << getEnumName() << " " << Index << "\n" << *TheDef;
}
#endif
std::vector<std::pair<Record *, SubtargetFeatureInfo>>
SubtargetFeatureInfo::getAll(const RecordKeeper &Records) {
std::vector<std::pair<Record *, SubtargetFeatureInfo>> SubtargetFeatures;
std::vector<Record *> AllPredicates =
Records.getAllDerivedDefinitions("Predicate");
for (Record *Pred : AllPredicates) {
// Ignore predicates that are not intended for the assembler.
//
// The "AssemblerMatcherPredicate" string should be promoted to an argument
// if we re-use the machinery for non-assembler purposes in future.
if (!Pred->getValueAsBit("AssemblerMatcherPredicate"))
continue;
if (Pred->getName().empty())
PrintFatalError(Pred->getLoc(), "Predicate has no name!");
// Ignore always true predicates.
if (Pred->getValueAsString("CondString").empty())
continue;
SubtargetFeatures.emplace_back(
Pred, SubtargetFeatureInfo(Pred, SubtargetFeatures.size()));
}
return SubtargetFeatures;
}
void SubtargetFeatureInfo::emitSubtargetFeatureBitEnumeration(
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS) {
OS << "// Bits for subtarget features that participate in "
<< "instruction matching.\n";
OS << "enum SubtargetFeatureBits : "
<< getMinimalTypeForRange(SubtargetFeatures.size()) << " {\n";
for (const auto &SF : SubtargetFeatures) {
const SubtargetFeatureInfo &SFI = SF.second;
OS << " " << SFI.getEnumBitName() << " = " << SFI.Index << ",\n";
}
OS << "};\n\n";
}
void SubtargetFeatureInfo::emitNameTable(
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS) {
// Need to sort the name table so that lookup by the log of the enum value
// gives the proper name. More specifically, for a feature of value 1<<n,
// SubtargetFeatureNames[n] should be the name of the feature.
uint64_t IndexUB = 0;
for (const auto &SF : SubtargetFeatures)
if (IndexUB <= SF.second.Index)
IndexUB = SF.second.Index+1;
std::vector<std::string> Names;
if (IndexUB > 0)
Names.resize(IndexUB);
for (const auto &SF : SubtargetFeatures)
Names[SF.second.Index] = SF.second.getEnumName();
OS << "static const char *SubtargetFeatureNames[] = {\n";
for (uint64_t I = 0; I < IndexUB; ++I)
OS << " \"" << Names[I] << "\",\n";
// A small number of targets have no predicates. Null terminate the array to
// avoid a zero-length array.
OS << " nullptr\n"
<< "};\n\n";
}
void SubtargetFeatureInfo::emitComputeAvailableFeatures(
StringRef TargetName, StringRef ClassName, StringRef FuncName,
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS,
StringRef ExtraParams) {
OS << "PredicateBitset " << TargetName << ClassName << "::\n"
<< FuncName << "(const " << TargetName << "Subtarget *Subtarget";
if (!ExtraParams.empty())
OS << ", " << ExtraParams;
OS << ") const {\n";
OS << " PredicateBitset Features;\n";
for (const auto &SF : SubtargetFeatures) {
const SubtargetFeatureInfo &SFI = SF.second;
StringRef CondStr = SFI.TheDef->getValueAsString("CondString");
assert(!CondStr.empty() && "true predicate should have been filtered");
OS << " if (" << CondStr << ")\n";
OS << " Features.set(" << SFI.getEnumBitName() << ");\n";
}
OS << " return Features;\n";
OS << "}\n\n";
}
void SubtargetFeatureInfo::emitComputeAssemblerAvailableFeatures(
StringRef TargetName, StringRef ClassName, StringRef FuncName,
SubtargetFeatureInfoMap &SubtargetFeatures, raw_ostream &OS) {
OS << "FeatureBitset " << TargetName << ClassName << "::\n"
<< FuncName << "(const FeatureBitset &FB) const {\n";
OS << " FeatureBitset Features;\n";
for (const auto &SF : SubtargetFeatures) {
const SubtargetFeatureInfo &SFI = SF.second;
OS << " if (";
const DagInit *D = SFI.TheDef->getValueAsDag("AssemblerCondDag");
std::string CombineType = D->getOperator()->getAsString();
if (CombineType != "any_of" && CombineType != "all_of")
PrintFatalError(SFI.TheDef->getLoc(), "Invalid AssemblerCondDag!");
if (D->getNumArgs() == 0)
PrintFatalError(SFI.TheDef->getLoc(), "Invalid AssemblerCondDag!");
bool IsOr = CombineType == "any_of";
if (IsOr)
OS << "(";
bool First = true;
for (auto *Arg : D->getArgs()) {
if (!First) {
if (IsOr)
OS << " || ";
else
OS << " && ";
}
if (auto *NotArg = dyn_cast<DagInit>(Arg)) {
if (NotArg->getOperator()->getAsString() != "not" ||
NotArg->getNumArgs() != 1)
PrintFatalError(SFI.TheDef->getLoc(), "Invalid AssemblerCondDag!");
Arg = NotArg->getArg(0);
OS << "!";
}
if (!isa<DefInit>(Arg) ||
!cast<DefInit>(Arg)->getDef()->isSubClassOf("SubtargetFeature"))
PrintFatalError(SFI.TheDef->getLoc(), "Invalid AssemblerCondDag!");
OS << "FB[" << TargetName << "::" << Arg->getAsString() << "]";
First = false;
}
if (IsOr)
OS << ")";
OS << ")\n";
OS << " Features.set(" << SFI.getEnumBitName() << ");\n";
}
OS << " return Features;\n";
OS << "}\n\n";
}
|
