main.cc

text/x-c-code

Filename: main.cc

Type: text/x-c-code

Part: 2

Message: Re: Use compiler intrinsics for bit ops in hash

#include "benchmark/benchmark.h"

#include "lzcnt.h"

static void BM_pfunc(benchmark::State& state) {
  auto word = state.range(0);
  for (auto _ : state) {
    lzcnt_pfunc(word);
  }
}

static void BM_slow(benchmark::State& state) {
  auto word = state.range(0);
  for (auto _ : state) {
    benchmark::DoNotOptimize(lzcnt_slow(word));
  }
}

static void BM_fast(benchmark::State& state) {
  auto word = state.range(0);
  for (auto _ : state) {
    lzcnt_fast(word);
  }
}

BENCHMARK(BM_pfunc)->Arg(0)->Range(1, 64);
BENCHMARK(BM_slow)->Arg(0)->Range(1, 64);
BENCHMARK(BM_fast)->Arg(0)->Range(1, 64);

BENCHMARK_MAIN();