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
BM_string_memcmp(benchmark::State & state)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
BM_string_memcpy(benchmark::State & state)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
BM_string_memmove(benchmark::State & state)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
BM_string_memset(benchmark::State & state)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
BM_string_strlen(benchmark::State & state)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