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RocksDB for Erlang

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rocksdb deps snappy third_party benchmark test donotoptimize_test.cc
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deps/snappy/third_party/benchmark/test/donotoptimize_test.cc 

#include <cstdint>



#include "benchmark/benchmark.h"



namespace {

#if defined(__GNUC__)

std::int64_t double_up(const std::int64_t x) __attribute__((const));

#endif

std::int64_t double_up(const std::int64_t x) { return x * 2; }

}  // namespace



// Using DoNotOptimize on types like BitRef seem to cause a lot of problems

// with the inline assembly on both GCC and Clang.

struct BitRef {

  int index;

  unsigned char& byte;



 public:

  static BitRef Make() {

    static unsigned char arr[2] = {};

    BitRef b(1, arr[0]);

    return b;

  }



 private:

  BitRef(int i, unsigned char& b) : index(i), byte(b) {}

};



int main(int, char*[]) {

  // this test verifies compilation of DoNotOptimize() for some types



  char buffer1[1] = "";

  benchmark::DoNotOptimize(buffer1);



  char buffer2[2] = "";

  benchmark::DoNotOptimize(buffer2);



  char buffer3[3] = "";

  benchmark::DoNotOptimize(buffer3);



  char buffer8[8] = "";

  benchmark::DoNotOptimize(buffer8);



  char buffer20[20] = "";

  benchmark::DoNotOptimize(buffer20);



  char buffer1024[1024] = "";

  benchmark::DoNotOptimize(buffer1024);

  char* bptr = &buffer1024[0];

  benchmark::DoNotOptimize(bptr);



  int x = 123;

  benchmark::DoNotOptimize(x);

  int* xp = &x;

  benchmark::DoNotOptimize(xp);

  benchmark::DoNotOptimize(x += 42);



  std::int64_t y = double_up(x);

  benchmark::DoNotOptimize(y);



  // These tests are to e

  BitRef lval = BitRef::Make();

  benchmark::DoNotOptimize(lval);



#ifdef BENCHMARK_HAS_CXX11

  // Check that accept rvalue.

  benchmark::DoNotOptimize(BitRef::Make());

#endif

}