benchmark/test/perf_counters_test.cc

#undef NDEBUG

#include "../src/perf_counters.h"

#include "../src/commandlineflags.h"
#include "benchmark/benchmark.h"
#include "output_test.h"

namespace benchmark {

BM_DECLARE_string(benchmark_perf_counters);

}  // namespace benchmark

static void BM_Simple(benchmark::State& state) {
  for (auto _ : state) {
    auto iterations = state.iterations();
    benchmark::DoNotOptimize(iterations);
  }
}
BENCHMARK(BM_Simple);
ADD_CASES(TC_JSONOut, {{"\"name\": \"BM_Simple\",$"}});

static void CheckSimple(Results const& e) {
  CHECK_COUNTER_VALUE(e, double, "CYCLES", GT, 0);
  CHECK_COUNTER_VALUE(e, double, "BRANCHES", GT, 0.0);
}
CHECK_BENCHMARK_RESULTS("BM_Simple", &CheckSimple);

int main(int argc, char* argv[]) {
  if (!benchmark::internal::PerfCounters::kSupported) {
    return 0;
  }
  benchmark::FLAGS_benchmark_perf_counters = "CYCLES,BRANCHES";
  benchmark::internal::PerfCounters::Initialize();
  RunOutputTests(argc, argv);
}