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
30static 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}
45BENCHMARK(BM_string_memcmp)->AT_COMMON_SIZES;
46
47static 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}
60BENCHMARK(BM_string_memcpy)->AT_COMMON_SIZES;
61
62static 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}
74BENCHMARK(BM_string_memmove)->AT_COMMON_SIZES;
75
76static 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}
87BENCHMARK(BM_string_memset)->AT_COMMON_SIZES;
88
89static 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}
103BENCHMARK(BM_string_strlen)->AT_COMMON_SIZES;
104