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      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 BENCHMARK_WITH_ARG(BM_string_memcmp, int)->AT_COMMON_SIZES;
     31 void BM_string_memcmp::Run(int iters, int nbytes) {
     32   StopBenchmarkTiming();
     33   char* src = new char[nbytes]; char* dst = new char[nbytes];
     34   memset(src, 'x', nbytes);
     35   memset(dst, 'x', nbytes);
     36   StartBenchmarkTiming();
     37 
     38   volatile int c __attribute__((unused)) = 0;
     39   for (int i = 0; i < iters; ++i) {
     40     c += memcmp(dst, src, nbytes);
     41   }
     42 
     43   StopBenchmarkTiming();
     44   SetBenchmarkBytesProcessed(uint64_t(iters) * uint64_t(nbytes));
     45   delete[] src;
     46   delete[] dst;
     47 }
     48 
     49 BENCHMARK_WITH_ARG(BM_string_memcpy, int)->AT_COMMON_SIZES;
     50 void BM_string_memcpy::Run(int iters, int nbytes) {
     51   StopBenchmarkTiming();
     52   char* src = new char[nbytes]; char* dst = new char[nbytes];
     53   memset(src, 'x', nbytes);
     54   StartBenchmarkTiming();
     55 
     56   for (int i = 0; i < iters; ++i) {
     57     memcpy(dst, src, nbytes);
     58   }
     59 
     60   StopBenchmarkTiming();
     61   SetBenchmarkBytesProcessed(uint64_t(iters) * uint64_t(nbytes));
     62   delete[] src;
     63   delete[] dst;
     64 }
     65 
     66 BENCHMARK_WITH_ARG(BM_string_memmove, int)->AT_COMMON_SIZES;
     67 void BM_string_memmove::Run(int iters, int nbytes) {
     68   StopBenchmarkTiming();
     69   char* buf = new char[nbytes + 64];
     70   memset(buf, 'x', nbytes + 64);
     71   StartBenchmarkTiming();
     72 
     73   for (int i = 0; i < iters; ++i) {
     74     memmove(buf, buf + 1, nbytes); // Worst-case overlap.
     75   }
     76 
     77   StopBenchmarkTiming();
     78   SetBenchmarkBytesProcessed(uint64_t(iters) * uint64_t(nbytes));
     79   delete[] buf;
     80 }
     81 
     82 BENCHMARK_WITH_ARG(BM_string_memset, int)->AT_COMMON_SIZES;
     83 void BM_string_memset::Run(int iters, int nbytes) {
     84   StopBenchmarkTiming();
     85   char* dst = new char[nbytes];
     86   StartBenchmarkTiming();
     87 
     88   for (int i = 0; i < iters; ++i) {
     89     memset(dst, 0, nbytes);
     90   }
     91 
     92   StopBenchmarkTiming();
     93   SetBenchmarkBytesProcessed(uint64_t(iters) * uint64_t(nbytes));
     94   delete[] dst;
     95 }
     96 
     97 BENCHMARK_WITH_ARG(BM_string_strlen, int)->AT_COMMON_SIZES;
     98 void BM_string_strlen::Run(int iters, int nbytes) {
     99   StopBenchmarkTiming();
    100   char* s = new char[nbytes];
    101   memset(s, 'x', nbytes);
    102   s[nbytes - 1] = 0;
    103   StartBenchmarkTiming();
    104 
    105   volatile int c __attribute__((unused)) = 0;
    106   for (int i = 0; i < iters; ++i) {
    107     c += strlen(s);
    108   }
    109 
    110   StopBenchmarkTiming();
    111   SetBenchmarkBytesProcessed(uint64_t(iters) * uint64_t(nbytes));
    112   delete[] s;
    113 }
    114