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 "benchmark.h"
18
19#include <string.h>
20
21#define KB 1024
22#define MB 1024*KB
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
29static void BM_string_memcmp(int iters, int nbytes) {
30  StopBenchmarkTiming();
31  char* src = new char[nbytes]; char* dst = new char[nbytes];
32  memset(src, 'x', nbytes);
33  memset(dst, 'x', nbytes);
34  StartBenchmarkTiming();
35
36  volatile int c __attribute__((unused)) = 0;
37  for (int i = 0; i < iters; ++i) {
38    c += memcmp(dst, src, nbytes);
39  }
40
41  StopBenchmarkTiming();
42  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
43  delete[] src;
44  delete[] dst;
45}
46BENCHMARK(BM_string_memcmp)->AT_COMMON_SIZES;
47
48static void BM_string_memcpy(int iters, int nbytes) {
49  StopBenchmarkTiming();
50  char* src = new char[nbytes]; char* dst = new char[nbytes];
51  memset(src, 'x', nbytes);
52  StartBenchmarkTiming();
53
54  for (int i = 0; i < iters; ++i) {
55    memcpy(dst, src, nbytes);
56  }
57
58  StopBenchmarkTiming();
59  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
60  delete[] src;
61  delete[] dst;
62}
63BENCHMARK(BM_string_memcpy)->AT_COMMON_SIZES;
64
65static void BM_string_memmove(int iters, int nbytes) {
66  StopBenchmarkTiming();
67  char* buf = new char[nbytes + 64];
68  memset(buf, 'x', nbytes + 64);
69  StartBenchmarkTiming();
70
71  for (int i = 0; i < iters; ++i) {
72    memmove(buf, buf + 1, nbytes); // Worst-case overlap.
73  }
74
75  StopBenchmarkTiming();
76  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
77  delete[] buf;
78}
79BENCHMARK(BM_string_memmove)->AT_COMMON_SIZES;
80
81static void BM_string_memset(int iters, int nbytes) {
82  StopBenchmarkTiming();
83  char* dst = new char[nbytes];
84  StartBenchmarkTiming();
85
86  for (int i = 0; i < iters; ++i) {
87    memset(dst, 0, nbytes);
88  }
89
90  StopBenchmarkTiming();
91  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
92  delete[] dst;
93}
94BENCHMARK(BM_string_memset)->AT_COMMON_SIZES;
95
96static void BM_string_strlen(int iters, int nbytes) {
97  StopBenchmarkTiming();
98  char* s = new char[nbytes];
99  memset(s, 'x', nbytes);
100  s[nbytes - 1] = 0;
101  StartBenchmarkTiming();
102
103  volatile int c __attribute__((unused)) = 0;
104  for (int i = 0; i < iters; ++i) {
105    c += strlen(s);
106  }
107
108  StopBenchmarkTiming();
109  SetBenchmarkBytesProcessed(int64_t(iters) * int64_t(nbytes));
110  delete[] s;
111}
112BENCHMARK(BM_string_strlen)->AT_COMMON_SIZES;
113