forked from OSchip/llvm-project
[llvm-exegesis] Cut run time of analysis mode by -84% (*sic*) (YamlContext::getInstrOpcode())
Summary:
```
$ perf stat -r 9 ./bin/llvm-exegesis -mode=analysis -analysis-epsilon=1.0 -benchmarks-file=/tmp/benchmarks-inverse_throughput-onefull.yaml -analysis-clusters-output-file="" -analysis-inconsistencies-output-file=/tmp/clusters-old.html
no exegesis target for x86_64-unknown-linux-gnu, using default
Parsed 14656 benchmark points
Printing sched class consistency analysis results to file '/tmp/clusters-old.html'
...
no exegesis target for x86_64-unknown-linux-gnu, using default
Parsed 14656 benchmark points
Printing sched class consistency analysis results to file '/tmp/clusters-old.html'
Performance counter stats for './bin/llvm-exegesis -mode=analysis -analysis-epsilon=1.0 -benchmarks-file=/tmp/benchmarks-inverse_throughput-onefull.yaml -analysis-clusters-output-file= -analysis-inconsistencies-output-file=/tmp/clusters-old.html' (9 runs):
9465.46 msec task-clock # 1.000 CPUs utilized ( +- 0.05% )
60 context-switches # 6.363 M/sec ( +- 79.45% )
0 cpu-migrations # 0.000 K/sec
11364 page-faults # 1200.697 M/sec ( +- 0.60% )
37935623543 cycles # 4008083.912 GHz ( +- 0.05% ) (83.32%)
2371625356 stalled-cycles-frontend # 6.25% frontend cycles idle ( +- 0.37% ) (83.32%)
8476077875 stalled-cycles-backend # 22.34% backend cycles idle ( +- 0.18% ) (33.36%)
41822439158 instructions # 1.10 insn per cycle
# 0.20 stalled cycles per insn ( +- 0.02% ) (50.03%)
11607658944 branches # 1226405861.486 M/sec ( +- 0.01% ) (66.69%)
210864633 branch-misses # 1.82% of all branches ( +- 0.06% ) (83.34%)
9.46636 +- 0.00441 seconds time elapsed ( +- 0.05% )
```
```
$ perf stat -r 9 ./bin/llvm-exegesis -mode=analysis -analysis-epsilon=1.0 -benchmarks-file=/tmp/benchmarks-inverse_throughput-onefull.yaml -analysis-clusters-output-file="" -analysis-inconsistencies-output-file=/tmp/clusters-bew.html
no exegesis target for x86_64-unknown-linux-gnu, using default
Parsed 14656 benchmark points
Printing sched class consistency analysis results to file '/tmp/clusters-bew.html'
...
no exegesis target for x86_64-unknown-linux-gnu, using default
Parsed 14656 benchmark points
Printing sched class consistency analysis results to file '/tmp/clusters-bew.html'
Performance counter stats for './bin/llvm-exegesis -mode=analysis -analysis-epsilon=1.0 -benchmarks-file=/tmp/benchmarks-inverse_throughput-onefull.yaml -analysis-clusters-output-file= -analysis-inconsistencies-output-file=/tmp/clusters-bew.html' (9 runs):
1480.66 msec task-clock # 1.000 CPUs utilized ( +- 0.19% )
13 context-switches # 8.483 M/sec ( +- 83.10% )
0 cpu-migrations # 0.075 M/sec ( +-100.00% )
11596 page-faults # 7834.247 M/sec ( +- 0.59% )
5933732194 cycles # 4008977.535 GHz ( +- 0.19% ) (83.22%)
438111928 stalled-cycles-frontend # 7.38% frontend cycles idle ( +- 0.37% ) (83.25%)
1454969705 stalled-cycles-backend # 24.52% backend cycles idle ( +- 0.94% ) (33.53%)
7724218604 instructions # 1.30 insn per cycle
# 0.19 stalled cycles per insn ( +- 0.07% ) (50.14%)
1979796413 branches # 1337599858.945 M/sec ( +- 0.06% ) (66.74%)
32641638 branch-misses # 1.65% of all branches ( +- 0.18% ) (83.31%)
1.48128 +- 0.00284 seconds time elapsed ( +- 0.19% )
$ sha512sum /tmp/clusters-*
db4bbd904fe8840853b589b032c5041bc060b91bcd9c27b914b56581fbc473550eea74b852238c79963b5adf2419f379e9f5db76784048b48e3937f9f3e732bf /tmp/clusters-bew.html
db4bbd904fe8840853b589b032c5041bc060b91bcd9c27b914b56581fbc473550eea74b852238c79963b5adf2419f379e9f5db76784048b48e3937f9f3e732bf /tmp/clusters-old.html
```
Reviewers: courbet, gchatelet
Reviewed By: courbet
Subscribers: tschuett, llvm-commits, RKSimon
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D57657
llvm-svn: 353024
This commit is contained in:
Roman Lebedev
parent
1a0d595f15
commit
5b94fe9623
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@ -9,8 +9,9 @@
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#include "BenchmarkResult.h"
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#include "BenchmarkRunner.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/bit.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/bit.h"
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#include "llvm/ObjectYAML/YAML.h"
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#include "llvm/Support/FileOutputBuffer.h"
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#include "llvm/Support/FileSystem.h"
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@ -29,7 +30,18 @@ namespace {
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// serialization process to encode/decode registers and instructions.
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struct YamlContext {
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YamlContext(const exegesis::LLVMState &State)
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: State(&State), ErrorStream(LastError) {}
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: State(&State), ErrorStream(LastError),
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OpcodeNameToOpcodeIdx(
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generateOpcodeNameToOpcodeIdxMapping(State.getInstrInfo())) {}
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static llvm::StringMap<unsigned>
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generateOpcodeNameToOpcodeIdxMapping(const llvm::MCInstrInfo &InstrInfo) {
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llvm::StringMap<unsigned> Map(InstrInfo.getNumOpcodes());
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for (unsigned I = 0, E = InstrInfo.getNumOpcodes(); I < E; ++I)
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Map[InstrInfo.getName(I)] = I;
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assert(Map.size() == InstrInfo.getNumOpcodes() && "Size prediction failed");
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return Map;
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};
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void serializeMCInst(const llvm::MCInst &MCInst, llvm::raw_ostream &OS) {
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OS << getInstrName(MCInst.getOpcode());
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@ -136,10 +148,9 @@ private:
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}
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unsigned getInstrOpcode(llvm::StringRef InstrName) {
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const llvm::MCInstrInfo &InstrInfo = State->getInstrInfo();
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for (unsigned E = InstrInfo.getNumOpcodes(), I = 0; I < E; ++I)
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if (InstrInfo.getName(I) == InstrName)
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return I;
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auto Iter = OpcodeNameToOpcodeIdx.find(InstrName);
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if (Iter != OpcodeNameToOpcodeIdx.end())
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return Iter->second;
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ErrorStream << "No opcode with name " << InstrName;
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return 0;
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}
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@ -147,6 +158,7 @@ private:
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const llvm::exegesis::LLVMState *State;
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std::string LastError;
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llvm::raw_string_ostream ErrorStream;
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const llvm::StringMap<unsigned> OpcodeNameToOpcodeIdx;
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};
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} // namespace
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