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fix: dont optimize out benches #18

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Merged
merged 1 commit into from
Jul 4, 2025
Merged

fix: dont optimize out benches #18

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6 changes: 6 additions & 0 deletions examples/google_benchmark_cmake/fixture_bench.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -16,10 +16,12 @@ class MyFixture : public benchmark::Fixture {
};
BENCHMARK_F(MyFixture, FooTest)(benchmark::State &st) {
for (auto _ : st) {
benchmark::ClobberMemory();
}
}
BENCHMARK_DEFINE_F(MyFixture, BarTest)(benchmark::State &st) {
for (auto _ : st) {
benchmark::ClobberMemory();
}
}
BENCHMARK_REGISTER_F(MyFixture, BarTest);
Expand All @@ -31,11 +33,13 @@ template <typename T>
class MyTemplatedFixture : public benchmark::Fixture {};
BENCHMARK_TEMPLATE_F(MyTemplatedFixture, IntTest, int)(benchmark::State &st) {
for (auto _ : st) {
benchmark::ClobberMemory();
}
}
BENCHMARK_TEMPLATE_DEFINE_F(MyTemplatedFixture, DoubleTest,
double)(benchmark::State &st) {
for (auto _ : st) {
benchmark::ClobberMemory();
}
}
BENCHMARK_REGISTER_F(MyTemplatedFixture, DoubleTest);
Expand All @@ -47,6 +51,7 @@ template <typename T>
class MyTemplate1 : public benchmark::Fixture {};
BENCHMARK_TEMPLATE1_DEFINE_F(MyTemplate1, TestA, int)(benchmark::State &st) {
for (auto _ : st) {
benchmark::ClobberMemory();
}
}
BENCHMARK_REGISTER_F(MyTemplate1, TestA);
Expand All @@ -59,6 +64,7 @@ class MyTemplate2 : public benchmark::Fixture {};
BENCHMARK_TEMPLATE2_DEFINE_F(MyTemplate2, TestB, int,
double)(benchmark::State &st) {
for (auto _ : st) {
benchmark::ClobberMemory();
}
}
BENCHMARK_REGISTER_F(MyTemplate2, TestB);
Expand Down
13 changes: 11 additions & 2 deletions examples/google_benchmark_cmake/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -8,8 +8,9 @@
template <class... Args>
void BM_Capture(benchmark::State &state, Args &&...args) {
auto args_tuple = std::make_tuple(std::move(args)...);
(void)args_tuple;
for (auto _ : state) {
benchmark::DoNotOptimize(args_tuple);
benchmark::ClobberMemory();
}
}
BENCHMARK_CAPTURE(BM_Capture, int_string_test, 42, std::string("abc"));
Expand All @@ -20,6 +21,8 @@ static void BM_rand_vector(benchmark::State &state) {
std::vector<int> v;
for (auto _ : state) {
std::string empty_string;
benchmark::DoNotOptimize(empty_string);
benchmark::ClobberMemory();
}
}
// Register the function as a benchmark
Expand All @@ -30,6 +33,8 @@ static void BM_StringCopy(benchmark::State &state) {
std::string x = "hello";
for (auto _ : state) {
std::string copy(x);
benchmark::DoNotOptimize(copy);
benchmark::ClobberMemory();
}
}
// Register the function as a benchmark
Expand All @@ -39,7 +44,11 @@ static void BM_memcpy(benchmark::State &state) {
char *src = new char[state.range(0)];
char *dst = new char[state.range(0)];
memset(src, 'x', state.range(0));
for (auto _ : state) memcpy(dst, src, state.range(0));
for (auto _ : state) {
memcpy(dst, src, state.range(0));
benchmark::DoNotOptimize(dst);
benchmark::ClobberMemory();
}
delete[] src;
delete[] dst;
}
Expand Down
4 changes: 4 additions & 0 deletions examples/google_benchmark_cmake/template_bench.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,8 @@ template <class T> void BM_Template(benchmark::State &state) {
std::vector<T> v;
for (auto _ : state) {
v.push_back(T());
benchmark::DoNotOptimize(v);
benchmark::ClobberMemory();
}
}
BENCHMARK_TEMPLATE(BM_Template, int);
Expand Down Expand Up @@ -46,6 +48,8 @@ template <typename T, class... ExtraArgs>
void BM_Template1_Capture(benchmark::State &state, ExtraArgs &&...extra_args) {
auto args_tuple = std::make_tuple(std::move(extra_args)...);
for (auto _ : state) {
benchmark::DoNotOptimize(args_tuple);
benchmark::ClobberMemory();
}
}
BENCHMARK_TEMPLATE1_CAPTURE(BM_Template1_Capture, void, int_string_test, 42,
Expand Down