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