mb.cpp

#include <benchmark/benchmark.h>
// ----------------------------------------------------------
// Benchmark                Time             CPU   Iterations
// ----------------------------------------------------------
// BM_StaticFalse       0.228 ns        0.227 ns   1000000000
// BM_StaticTrue        0.457 ns        0.456 ns   1000000000
// BM_DynamicFalse      0.228 ns        0.228 ns   1000000000
// BM_DynamicTrue       0.458 ns        0.457 ns   1000000000

void func_static_false() {
  benchmark::DoNotOptimize(42);
}

void func_static_true() {
  benchmark::DoNotOptimize(42);
  benchmark::DoNotOptimize(42);
}

void func_dynamic(bool val) {
  if (val) {
    benchmark::DoNotOptimize(42);
  }
  benchmark::DoNotOptimize(42);
}

static void BM_StaticFalse(benchmark::State& state) {
  for (auto _ : state) {
    func_static_false();
  }
}
BENCHMARK(BM_StaticFalse);

static void BM_StaticTrue(benchmark::State& state) {
  for (auto _ : state) {
    func_static_true();
  }
}
BENCHMARK(BM_StaticTrue);

static void BM_DynamicFalse(benchmark::State& state) {
  for (auto _ : state) {
    func_dynamic(false);
  }
}
BENCHMARK(BM_DynamicFalse);

static void BM_DynamicTrue(benchmark::State& state) {
  for (auto _ : state) {
    func_dynamic(true);
  }
}
BENCHMARK(BM_DynamicTrue);

BENCHMARK_MAIN();