3e5d8a1439
This reverts commit 334e9bf2dd01fbbfe785624c0de477b725cde6f2. Check if llvm-nm exists before building the benchmark.
122 lines
4.0 KiB
C++
122 lines
4.0 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/RuntimeLibcalls.h"
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#include "benchmark/benchmark.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/LineIterator.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/TargetParser/Triple.h"
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#include <random>
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#include <string>
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using namespace llvm;
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static constexpr unsigned MaxFuncNameSize = 53;
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static std::vector<StringRef> getLibcallNameStringRefs() {
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std::vector<StringRef> Names(RTLIB::NumLibcallImpls);
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// Keep the strlens on the StringRef construction out of the benchmark loop.
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for (RTLIB::LibcallImpl LC : RTLIB::libcall_impls())
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Names[LC] = RTLIB::RuntimeLibcallsInfo::getLibcallImplName(LC);
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return Names;
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}
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static std::vector<std::string> getRandomFuncNames() {
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std::mt19937_64 Rng;
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std::uniform_int_distribution<> StringLengthDistribution(1, MaxFuncNameSize);
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std::uniform_int_distribution<> CharDistribution(1, 255);
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int NumTestFuncs = 1 << 10;
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std::vector<std::string> TestFuncNames(NumTestFuncs);
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for (std::string &TestFuncName : TestFuncNames) {
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for (int I = 0, E = StringLengthDistribution(Rng); I != E; ++I)
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TestFuncName += static_cast<char>(CharDistribution(Rng));
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}
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return TestFuncNames;
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}
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#ifdef SYMBOL_TEST_DATA_FILE
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static std::vector<std::string> readSymbolsFromFile(StringRef InputFile) {
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auto BufOrError = MemoryBuffer::getFileOrSTDIN(InputFile, /*IsText=*/true);
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if (!BufOrError) {
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reportFatalUsageError("failed to open \'" + Twine(InputFile) +
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"\': " + BufOrError.getError().message());
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}
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// Hackily figure out if there's a prefix on the symbol names - llvm-nm
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// appears to not have a flag to skip this.
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llvm::Triple HostTriple(LLVM_HOST_TRIPLE);
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std::string DummyDatalayout = "e";
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DummyDatalayout += DataLayout::getManglingComponent(HostTriple);
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DataLayout DL(DummyDatalayout);
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char GlobalPrefix = DL.getGlobalPrefix();
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std::vector<std::string> Lines;
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for (line_iterator LineIt(**BufOrError, /*SkipBlanks=*/true);
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!LineIt.is_at_eof(); ++LineIt) {
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StringRef SymbolName = *LineIt;
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SymbolName.consume_front(StringRef(&GlobalPrefix, 1));
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Lines.push_back(SymbolName.str());
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}
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return Lines;
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}
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#endif
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static void BM_LookupRuntimeLibcallByNameKnownCalls(benchmark::State &State) {
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std::vector<StringRef> Names = getLibcallNameStringRefs();
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for (auto _ : State) {
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for (StringRef Name : Names) {
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benchmark::DoNotOptimize(
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RTLIB::RuntimeLibcallsInfo::lookupLibcallImplName(Name).empty());
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}
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}
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}
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static void BM_LookupRuntimeLibcallByNameRandomCalls(benchmark::State &State) {
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std::vector<std::string> TestFuncNames = getRandomFuncNames();
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for (auto _ : State) {
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for (const std::string &Name : TestFuncNames) {
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benchmark::DoNotOptimize(
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RTLIB::RuntimeLibcallsInfo::lookupLibcallImplName(StringRef(Name))
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.empty());
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}
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}
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}
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#ifdef SYMBOL_TEST_DATA_FILE
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// This isn't fully representative, it doesn't include any anonymous functions.
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// nm -n --no-demangle --format=just-symbols sample-binary > sample.txt
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static void BM_LookupRuntimeLibcallByNameSampleData(benchmark::State &State) {
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std::vector<std::string> TestFuncNames =
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readSymbolsFromFile(SYMBOL_TEST_DATA_FILE);
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for (auto _ : State) {
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for (const std::string &Name : TestFuncNames) {
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benchmark::DoNotOptimize(
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RTLIB::RuntimeLibcallsInfo::lookupLibcallImplName(StringRef(Name))
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.empty());
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}
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}
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}
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#endif
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BENCHMARK(BM_LookupRuntimeLibcallByNameKnownCalls);
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BENCHMARK(BM_LookupRuntimeLibcallByNameRandomCalls);
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#ifdef SYMBOL_TEST_DATA_FILE
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BENCHMARK(BM_LookupRuntimeLibcallByNameSampleData);
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#endif
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BENCHMARK_MAIN();
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