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
| //===-- Target.cpp ----------------------------------------------*- C++ -*-===//
//
// 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 "Target.h"
#include "Latency.h"
#include "Uops.h"
namespace llvm {
namespace exegesis {
ExegesisTarget::~ExegesisTarget() {} // anchor.
static ExegesisTarget *FirstTarget = nullptr;
const ExegesisTarget *ExegesisTarget::lookup(Triple TT) {
for (const ExegesisTarget *T = FirstTarget; T != nullptr; T = T->Next) {
if (T->matchesArch(TT.getArch()))
return T;
}
return nullptr;
}
void ExegesisTarget::registerTarget(ExegesisTarget *Target) {
if (FirstTarget == nullptr) {
FirstTarget = Target;
return;
}
if (Target->Next != nullptr)
return; // Already registered.
Target->Next = FirstTarget;
FirstTarget = Target;
}
std::unique_ptr<SnippetGenerator> ExegesisTarget::createSnippetGenerator(
InstructionBenchmark::ModeE Mode, const LLVMState &State,
const SnippetGenerator::Options &Opts) const {
switch (Mode) {
case InstructionBenchmark::Unknown:
return nullptr;
case InstructionBenchmark::Latency:
return createLatencySnippetGenerator(State, Opts);
case InstructionBenchmark::Uops:
case InstructionBenchmark::InverseThroughput:
return createUopsSnippetGenerator(State, Opts);
}
return nullptr;
}
std::unique_ptr<BenchmarkRunner>
ExegesisTarget::createBenchmarkRunner(InstructionBenchmark::ModeE Mode,
const LLVMState &State) const {
switch (Mode) {
case InstructionBenchmark::Unknown:
return nullptr;
case InstructionBenchmark::Latency:
case InstructionBenchmark::InverseThroughput:
return createLatencyBenchmarkRunner(State, Mode);
case InstructionBenchmark::Uops:
return createUopsBenchmarkRunner(State);
}
return nullptr;
}
std::unique_ptr<SnippetGenerator> ExegesisTarget::createLatencySnippetGenerator(
const LLVMState &State, const SnippetGenerator::Options &Opts) const {
return std::make_unique<LatencySnippetGenerator>(State, Opts);
}
std::unique_ptr<SnippetGenerator> ExegesisTarget::createUopsSnippetGenerator(
const LLVMState &State, const SnippetGenerator::Options &Opts) const {
return std::make_unique<UopsSnippetGenerator>(State, Opts);
}
std::unique_ptr<BenchmarkRunner> ExegesisTarget::createLatencyBenchmarkRunner(
const LLVMState &State, InstructionBenchmark::ModeE Mode) const {
return std::make_unique<LatencyBenchmarkRunner>(State, Mode);
}
std::unique_ptr<BenchmarkRunner>
ExegesisTarget::createUopsBenchmarkRunner(const LLVMState &State) const {
return std::make_unique<UopsBenchmarkRunner>(State);
}
void ExegesisTarget::randomizeMCOperand(const Instruction &Instr,
const Variable &Var,
MCOperand &AssignedValue,
const BitVector &ForbiddenRegs) const {
const Operand &Op = Instr.getPrimaryOperand(Var);
switch (Op.getExplicitOperandInfo().OperandType) {
case MCOI::OperandType::OPERAND_IMMEDIATE:
// FIXME: explore immediate values too.
AssignedValue = MCOperand::createImm(1);
break;
case MCOI::OperandType::OPERAND_REGISTER: {
assert(Op.isReg());
auto AllowedRegs = Op.getRegisterAliasing().sourceBits();
assert(AllowedRegs.size() == ForbiddenRegs.size());
for (auto I : ForbiddenRegs.set_bits())
AllowedRegs.reset(I);
AssignedValue = MCOperand::createReg(randomBit(AllowedRegs));
break;
}
default:
break;
}
}
static_assert(std::is_pod<PfmCountersInfo>::value,
"We shouldn't have dynamic initialization here");
const PfmCountersInfo PfmCountersInfo::Default = {nullptr, nullptr, nullptr,
0u};
const PfmCountersInfo &ExegesisTarget::getPfmCounters(StringRef CpuName) const {
assert(std::is_sorted(
CpuPfmCounters.begin(), CpuPfmCounters.end(),
[](const CpuAndPfmCounters &LHS, const CpuAndPfmCounters &RHS) {
return strcmp(LHS.CpuName, RHS.CpuName) < 0;
}) &&
"CpuPfmCounters table is not sorted");
// Find entry
auto Found =
std::lower_bound(CpuPfmCounters.begin(), CpuPfmCounters.end(), CpuName);
if (Found == CpuPfmCounters.end() || StringRef(Found->CpuName) != CpuName) {
// Use the default.
if (CpuPfmCounters.begin() != CpuPfmCounters.end() &&
CpuPfmCounters.begin()->CpuName[0] == '\0') {
Found = CpuPfmCounters.begin(); // The target specifies a default.
} else {
return PfmCountersInfo::Default; // No default for the target.
}
}
assert(Found->PCI && "Missing counters");
return *Found->PCI;
}
namespace {
// Default implementation.
class ExegesisDefaultTarget : public ExegesisTarget {
public:
ExegesisDefaultTarget() : ExegesisTarget({}) {}
private:
std::vector<MCInst> setRegTo(const MCSubtargetInfo &STI, unsigned Reg,
const APInt &Value) const override {
llvm_unreachable("Not yet implemented");
}
bool matchesArch(Triple::ArchType Arch) const override {
llvm_unreachable("never called");
return false;
}
};
} // namespace
const ExegesisTarget &ExegesisTarget::getDefault() {
static ExegesisDefaultTarget Target;
return Target;
}
} // namespace exegesis
} // namespace llvm
|