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      1 /*
      2  * Copyright (C) 2013 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 <fenv.h>
     18 #include <math.h>
     19 
     20 #include <benchmark/Benchmark.h>
     21 
     22 #define AT_COMMON_VALS \
     23     Arg(1234.0)->Arg(nan(""))->Arg(HUGE_VAL)->Arg(0.0)
     24 
     25 // Avoid optimization.
     26 volatile double d;
     27 volatile double v;
     28 
     29 BENCHMARK_NO_ARG(BM_math_sqrt);
     30 void BM_math_sqrt::Run(int iters) {
     31   StartBenchmarkTiming();
     32 
     33   d = 0.0;
     34   v = 2.0;
     35   for (int i = 0; i < iters; ++i) {
     36     d += sqrt(v);
     37   }
     38 
     39   StopBenchmarkTiming();
     40 }
     41 
     42 BENCHMARK_NO_ARG(BM_math_log10);
     43 void BM_math_log10::Run(int iters) {
     44   StartBenchmarkTiming();
     45 
     46   d = 0.0;
     47   v = 1234.0;
     48   for (int i = 0; i < iters; ++i) {
     49     d += log10(v);
     50   }
     51 
     52   StopBenchmarkTiming();
     53 }
     54 
     55 BENCHMARK_NO_ARG(BM_math_logb);
     56 void BM_math_logb::Run(int iters) {
     57   StartBenchmarkTiming();
     58 
     59   d = 0.0;
     60   v = 1234.0;
     61   for (int i = 0; i < iters; ++i) {
     62     d += logb(v);
     63   }
     64 
     65   StopBenchmarkTiming();
     66 }
     67 
     68 BENCHMARK_WITH_ARG(BM_math_isinf, double)->AT_COMMON_VALS;
     69 void BM_math_isinf::Run(int iters, double value) {
     70   StartBenchmarkTiming();
     71 
     72   d = 0.0;
     73   v = value;
     74   for (int i = 0; i < iters; ++i) {
     75     d += (isinf)(v);
     76   }
     77 
     78   StopBenchmarkTiming();
     79 }
     80 
     81 BENCHMARK_NO_ARG(BM_math_sin_fast);
     82 void BM_math_sin_fast::Run(int iters) {
     83   StartBenchmarkTiming();
     84 
     85   d = 1.0;
     86   for (int i = 0; i < iters; ++i) {
     87     d += sin(d);
     88   }
     89 
     90   StopBenchmarkTiming();
     91 }
     92 
     93 BENCHMARK_NO_ARG(BM_math_sin_feupdateenv);
     94 void BM_math_sin_feupdateenv::Run(int iters) {
     95   StartBenchmarkTiming();
     96 
     97   d = 1.0;
     98   for (int i = 0; i < iters; ++i) {
     99     fenv_t __libc_save_rm;
    100     feholdexcept(&__libc_save_rm);
    101     fesetround(FE_TONEAREST);
    102     d += sin(d);
    103     feupdateenv(&__libc_save_rm);
    104   }
    105 
    106   StopBenchmarkTiming();
    107 }
    108 
    109 BENCHMARK_NO_ARG(BM_math_sin_fesetenv);
    110 void BM_math_sin_fesetenv::Run(int iters) {
    111   StartBenchmarkTiming();
    112 
    113   d = 1.0;
    114   for (int i = 0; i < iters; ++i) {
    115     fenv_t __libc_save_rm;
    116     feholdexcept(&__libc_save_rm);
    117     fesetround(FE_TONEAREST);
    118     d += sin(d);
    119     fesetenv(&__libc_save_rm);
    120   }
    121 
    122   StopBenchmarkTiming();
    123 }
    124 
    125 BENCHMARK_WITH_ARG(BM_math_fpclassify, double)->AT_COMMON_VALS;
    126 void BM_math_fpclassify::Run(int iters, double value) {
    127   StartBenchmarkTiming();
    128 
    129   d = 0.0;
    130   v = value;
    131   for (int i = 0; i < iters; ++i) {
    132     d += fpclassify(v);
    133   }
    134 
    135   StopBenchmarkTiming();
    136 }
    137