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 #define KB 1024 23 #define MB 1024*KB 24 25 #define AT_COMMON_SIZES \ 26 Arg(8)->Arg(64)->Arg(512)->Arg(1*KB)->Arg(8*KB)->Arg(16*KB)->Arg(32*KB)->Arg(64*KB) 27 28 // TODO: test unaligned operation too? (currently everything will be 8-byte aligned by malloc.) 29 30 static void BM_string_memcmp(benchmark::State& state) { 31 const size_t nbytes = state.range_x(); 32 char* src = new char[nbytes]; char* dst = new char[nbytes]; 33 memset(src, 'x', nbytes); 34 memset(dst, 'x', nbytes); 35 36 volatile int c __attribute__((unused)) = 0; 37 while (state.KeepRunning()) { 38 c += memcmp(dst, src, nbytes); 39 } 40 41 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 42 delete[] src; 43 delete[] dst; 44 } 45 BENCHMARK(BM_string_memcmp)->AT_COMMON_SIZES; 46 47 static void BM_string_memcpy(benchmark::State& state) { 48 const size_t nbytes = state.range_x(); 49 char* src = new char[nbytes]; char* dst = new char[nbytes]; 50 memset(src, 'x', nbytes); 51 52 while (state.KeepRunning()) { 53 memcpy(dst, src, nbytes); 54 } 55 56 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 57 delete[] src; 58 delete[] dst; 59 } 60 BENCHMARK(BM_string_memcpy)->AT_COMMON_SIZES; 61 62 static void BM_string_memmove(benchmark::State& state) { 63 const size_t nbytes = state.range_x(); 64 char* buf = new char[nbytes + 64]; 65 memset(buf, 'x', nbytes + 64); 66 67 while (state.KeepRunning()) { 68 memmove(buf, buf + 1, nbytes); // Worst-case overlap. 69 } 70 71 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 72 delete[] buf; 73 } 74 BENCHMARK(BM_string_memmove)->AT_COMMON_SIZES; 75 76 static void BM_string_memset(benchmark::State& state) { 77 const size_t nbytes = state.range_x(); 78 char* dst = new char[nbytes]; 79 80 while (state.KeepRunning()) { 81 memset(dst, 0, nbytes); 82 } 83 84 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 85 delete[] dst; 86 } 87 BENCHMARK(BM_string_memset)->AT_COMMON_SIZES; 88 89 static void BM_string_strlen(benchmark::State& state) { 90 const size_t nbytes = state.range_x(); 91 char* s = new char[nbytes]; 92 memset(s, 'x', nbytes); 93 s[nbytes - 1] = 0; 94 95 volatile int c __attribute__((unused)) = 0; 96 while (state.KeepRunning()) { 97 c += strlen(s); 98 } 99 100 state.SetBytesProcessed(uint64_t(state.iterations()) * uint64_t(nbytes)); 101 delete[] s; 102 } 103 BENCHMARK(BM_string_strlen)->AT_COMMON_SIZES; 104
