1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include <stdint.h> 18 #include <string.h> 19 20 #include <benchmark/benchmark.h> 21 22 constexpr auto KB = 1024; 23 24 #define AT_COMMON_SIZES \ 25 Arg(8)->Arg(64)->Arg(512)->Arg(1*KB)->Arg(8*KB)->Arg(16*KB)->Arg(32*KB)->Arg(64*KB) 26 27 // TODO: test unaligned operation too? (currently everything will be 8-byte aligned by malloc.) 28 29 static void BM_string_memcmp(benchmark::State& state) { 30 const size_t nbytes = state.range(0); 31 char* src = new char[nbytes]; char* dst = new char[nbytes]; 32 memset(src, 'x', nbytes); 33 memset(dst, 'x', nbytes); 34 35 volatile int c __attribute__((unused)) = 0; 36 while (state.KeepRunning()) { 37 c += memcmp(dst, src, nbytes); 38 } 39 40 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 41 delete[] src; 42 delete[] dst; 43 } 44 BENCHMARK(BM_string_memcmp)->AT_COMMON_SIZES; 45 46 static void BM_string_memcpy(benchmark::State& state) { 47 const size_t nbytes = state.range(0); 48 char* src = new char[nbytes]; char* dst = new char[nbytes]; 49 memset(src, 'x', nbytes); 50 51 while (state.KeepRunning()) { 52 memcpy(dst, src, nbytes); 53 } 54 55 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 56 delete[] src; 57 delete[] dst; 58 } 59 BENCHMARK(BM_string_memcpy)->AT_COMMON_SIZES; 60 61 static void BM_string_memmove(benchmark::State& state) { 62 const size_t nbytes = state.range(0); 63 char* buf = new char[nbytes + 64]; 64 memset(buf, 'x', nbytes + 64); 65 66 while (state.KeepRunning()) { 67 memmove(buf, buf + 1, nbytes); // Worst-case overlap. 68 } 69 70 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 71 delete[] buf; 72 } 73 BENCHMARK(BM_string_memmove)->AT_COMMON_SIZES; 74 75 static void BM_string_memset(benchmark::State& state) { 76 const size_t nbytes = state.range(0); 77 char* dst = new char[nbytes]; 78 79 while (state.KeepRunning()) { 80 memset(dst, 0, nbytes); 81 } 82 83 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 84 delete[] dst; 85 } 86 BENCHMARK(BM_string_memset)->AT_COMMON_SIZES; 87 88 static void BM_string_strlen(benchmark::State& state) { 89 const size_t nbytes = state.range(0); 90 char* s = new char[nbytes]; 91 memset(s, 'x', nbytes); 92 s[nbytes - 1] = 0; 93 94 volatile int c __attribute__((unused)) = 0; 95 while (state.KeepRunning()) { 96 c += strlen(s); 97 } 98 99 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 100 delete[] s; 101 } 102 BENCHMARK(BM_string_strlen)->AT_COMMON_SIZES; 103
