102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdint.h>
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#include <string.h>
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#include <benchmark/benchmark.h>
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constexpr auto KB = 1024;
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#define AT_COMMON_SIZES \
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Arg(8)->Arg(64)->Arg(512)->Arg(1*KB)->Arg(8*KB)->Arg(16*KB)->Arg(32*KB)->Arg(64*KB)
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// TODO: test unaligned operation too? (currently everything will be 8-byte aligned by malloc.)
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static void BM_string_memcmp(benchmark::State& state) {
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const size_t nbytes = state.range(0);
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char* src = new char[nbytes]; char* dst = new char[nbytes];
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memset(src, 'x', nbytes);
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memset(dst, 'x', nbytes);
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volatile int c __attribute__((unused)) = 0;
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while (state.KeepRunning()) {
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c += memcmp(dst, src, nbytes);
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}
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state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes));
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delete[] src;
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delete[] dst;
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}
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BENCHMARK(BM_string_memcmp)->AT_COMMON_SIZES;
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static void BM_string_memcpy(benchmark::State& state) {
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const size_t nbytes = state.range(0);
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char* src = new char[nbytes]; char* dst = new char[nbytes];
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memset(src, 'x', nbytes);
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while (state.KeepRunning()) {
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memcpy(dst, src, nbytes);
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}
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state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes));
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delete[] src;
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delete[] dst;
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}
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BENCHMARK(BM_string_memcpy)->AT_COMMON_SIZES;
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static void BM_string_memmove(benchmark::State& state) {
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const size_t nbytes = state.range(0);
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char* buf = new char[nbytes + 64];
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memset(buf, 'x', nbytes + 64);
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while (state.KeepRunning()) {
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memmove(buf, buf + 1, nbytes); // Worst-case overlap.
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}
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state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes));
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delete[] buf;
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}
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BENCHMARK(BM_string_memmove)->AT_COMMON_SIZES;
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static void BM_string_memset(benchmark::State& state) {
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const size_t nbytes = state.range(0);
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char* dst = new char[nbytes];
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while (state.KeepRunning()) {
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memset(dst, 0, nbytes);
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}
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state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes));
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delete[] dst;
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}
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BENCHMARK(BM_string_memset)->AT_COMMON_SIZES;
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static void BM_string_strlen(benchmark::State& state) {
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const size_t nbytes = state.range(0);
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char* s = new char[nbytes];
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memset(s, 'x', nbytes);
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s[nbytes - 1] = 0;
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volatile int c __attribute__((unused)) = 0;
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while (state.KeepRunning()) {
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c += strlen(s);
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}
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state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes));
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delete[] s;
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}
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BENCHMARK(BM_string_strlen)->AT_COMMON_SIZES;
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