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
201
202
203
204
205
206
207
208
209
210
211
|
//===- ExegesisEmitter.cpp - Generate exegesis target data ----------------===//
//
// 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 tablegen backend emits llvm-exegesis information.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TableGen/Error.h"
#include "llvm/TableGen/Record.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <cassert>
#include <map>
#include <string>
#include <vector>
using namespace llvm;
#define DEBUG_TYPE "exegesis-emitter"
namespace {
class ExegesisEmitter {
public:
ExegesisEmitter(RecordKeeper &RK);
void run(raw_ostream &OS) const;
private:
unsigned getPfmCounterId(llvm::StringRef Name) const {
const auto It = PfmCounterNameTable.find(Name);
if (It == PfmCounterNameTable.end())
PrintFatalError("no pfm counter id for " + Name);
return It->second;
}
// Collects all the ProcPfmCounters definitions available in this target.
void emitPfmCounters(raw_ostream &OS) const;
void emitPfmCountersInfo(const Record &Def,
unsigned &IssueCountersTableOffset,
raw_ostream &OS) const;
void emitPfmCountersLookupTable(raw_ostream &OS) const;
RecordKeeper &Records;
std::string Target;
// Table of counter name -> counter index.
const std::map<llvm::StringRef, unsigned> PfmCounterNameTable;
};
static std::map<llvm::StringRef, unsigned>
collectPfmCounters(const RecordKeeper &Records) {
std::map<llvm::StringRef, unsigned> PfmCounterNameTable;
const auto AddPfmCounterName = [&PfmCounterNameTable](
const Record *PfmCounterDef) {
const llvm::StringRef Counter = PfmCounterDef->getValueAsString("Counter");
if (!Counter.empty())
PfmCounterNameTable.emplace(Counter, 0);
};
for (Record *Def : Records.getAllDerivedDefinitions("ProcPfmCounters")) {
// Check that ResourceNames are unique.
llvm::SmallSet<llvm::StringRef, 16> Seen;
for (const Record *IssueCounter :
Def->getValueAsListOfDefs("IssueCounters")) {
const llvm::StringRef ResourceName =
IssueCounter->getValueAsString("ResourceName");
if (ResourceName.empty())
PrintFatalError(IssueCounter->getLoc(), "invalid empty ResourceName");
if (!Seen.insert(ResourceName).second)
PrintFatalError(IssueCounter->getLoc(),
"duplicate ResourceName " + ResourceName);
AddPfmCounterName(IssueCounter);
}
AddPfmCounterName(Def->getValueAsDef("CycleCounter"));
AddPfmCounterName(Def->getValueAsDef("UopsCounter"));
}
unsigned Index = 0;
for (auto &NameAndIndex : PfmCounterNameTable)
NameAndIndex.second = Index++;
return PfmCounterNameTable;
}
ExegesisEmitter::ExegesisEmitter(RecordKeeper &RK)
: Records(RK), PfmCounterNameTable(collectPfmCounters(RK)) {
std::vector<Record *> Targets = Records.getAllDerivedDefinitions("Target");
if (Targets.size() == 0)
PrintFatalError("No 'Target' subclasses defined!");
if (Targets.size() != 1)
PrintFatalError("Multiple subclasses of Target defined!");
Target = std::string(Targets[0]->getName());
}
void ExegesisEmitter::emitPfmCountersInfo(const Record &Def,
unsigned &IssueCountersTableOffset,
raw_ostream &OS) const {
const auto CycleCounter =
Def.getValueAsDef("CycleCounter")->getValueAsString("Counter");
const auto UopsCounter =
Def.getValueAsDef("UopsCounter")->getValueAsString("Counter");
const size_t NumIssueCounters =
Def.getValueAsListOfDefs("IssueCounters").size();
OS << "\nstatic const PfmCountersInfo " << Target << Def.getName()
<< " = {\n";
// Cycle Counter.
if (CycleCounter.empty())
OS << " nullptr, // No cycle counter.\n";
else
OS << " " << Target << "PfmCounterNames[" << getPfmCounterId(CycleCounter)
<< "], // Cycle counter\n";
// Uops Counter.
if (UopsCounter.empty())
OS << " nullptr, // No uops counter.\n";
else
OS << " " << Target << "PfmCounterNames[" << getPfmCounterId(UopsCounter)
<< "], // Uops counter\n";
// Issue Counters
if (NumIssueCounters == 0)
OS << " nullptr, // No issue counters.\n 0\n";
else
OS << " " << Target << "PfmIssueCounters + " << IssueCountersTableOffset
<< ", " << NumIssueCounters << " // Issue counters.\n";
OS << "};\n";
IssueCountersTableOffset += NumIssueCounters;
}
void ExegesisEmitter::emitPfmCounters(raw_ostream &OS) const {
// Emit the counter name table.
OS << "\nstatic const char *" << Target << "PfmCounterNames[] = {\n";
for (const auto &NameAndIndex : PfmCounterNameTable)
OS << " \"" << NameAndIndex.first << "\", // " << NameAndIndex.second
<< "\n";
OS << "};\n\n";
// Emit the IssueCounters table.
const auto PfmCounterDefs =
Records.getAllDerivedDefinitions("ProcPfmCounters");
// Only emit if non-empty.
const bool HasAtLeastOnePfmIssueCounter =
llvm::any_of(PfmCounterDefs, [](const Record *Def) {
return !Def->getValueAsListOfDefs("IssueCounters").empty();
});
if (HasAtLeastOnePfmIssueCounter) {
OS << "static const PfmCountersInfo::IssueCounter " << Target
<< "PfmIssueCounters[] = {\n";
for (const Record *Def : PfmCounterDefs) {
for (const Record *ICDef : Def->getValueAsListOfDefs("IssueCounters"))
OS << " { " << Target << "PfmCounterNames["
<< getPfmCounterId(ICDef->getValueAsString("Counter")) << "], \""
<< ICDef->getValueAsString("ResourceName") << "\"},\n";
}
OS << "};\n";
}
// Now generate the PfmCountersInfo.
unsigned IssueCountersTableOffset = 0;
for (const Record *Def : PfmCounterDefs)
emitPfmCountersInfo(*Def, IssueCountersTableOffset, OS);
OS << "\n";
} // namespace
void ExegesisEmitter::emitPfmCountersLookupTable(raw_ostream &OS) const {
std::vector<Record *> Bindings =
Records.getAllDerivedDefinitions("PfmCountersBinding");
assert(!Bindings.empty() && "there must be at least one binding");
llvm::sort(Bindings, [](const Record *L, const Record *R) {
return L->getValueAsString("CpuName") < R->getValueAsString("CpuName");
});
OS << "// Sorted (by CpuName) array of pfm counters.\n"
<< "static const CpuAndPfmCounters " << Target << "CpuPfmCounters[] = {\n";
for (Record *Binding : Bindings) {
// Emit as { "cpu", procinit },
OS << " { \"" //
<< Binding->getValueAsString("CpuName") << "\"," //
<< " &" << Target << Binding->getValueAsDef("Counters")->getName() //
<< " },\n";
}
OS << "};\n\n";
}
void ExegesisEmitter::run(raw_ostream &OS) const {
emitSourceFileHeader("Exegesis Tables", OS);
emitPfmCounters(OS);
emitPfmCountersLookupTable(OS);
}
} // end anonymous namespace
namespace llvm {
void EmitExegesis(RecordKeeper &RK, raw_ostream &OS) {
ExegesisEmitter(RK).run(OS);
}
} // end namespace llvm
|
