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make DoNotOptimize work with rvalues and convert basic_test to use it.

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This commit is contained in:
Eric Fiselier 2015-03-27 04:53:09 -04:00
parent 21cc79f397
commit 6bc1d1c19e
2 changed files with 13 additions and 24 deletions
include/benchmark
benchmark_api.h
test
basic_test.cc

4
include/benchmark/benchmark_api.h
View File

@ -184,12 +184,12 @@ void UseCharPointer(char const volatile*);
// See: http://stackoverflow.com/questions/28287064
#if defined(__GNUC__)
template <class Tp>
inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp& value) {
inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp const& value) {
asm volatile("" : "+r" (value));
}
#else
template <class Tp>
inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp& value) {
inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp const& value) {
internal::UseCharPointer(&reinterpret_cast<char const volatile&>(value));
}
#endif

33
test/basic_test.cc
View File

@ -8,8 +8,7 @@
void BM_empty(benchmark::State& state) {
while (state.KeepRunning()) {
volatile std::size_t x = state.iterations();
((void)x);
benchmark::DoNotOptimize(state.iterations());
}
}
BENCHMARK(BM_empty);
@ -18,8 +17,7 @@ BENCHMARK(BM_empty)->ThreadPerCpu();
void BM_spin_empty(benchmark::State& state) {
while (state.KeepRunning()) {
for (int x = 0; x < state.range_x(); ++x) {
volatile int dummy = x;
((void)dummy);
benchmark::DoNotOptimize(x);
}
}
}
@ -28,13 +26,11 @@ BASIC_BENCHMARK_TEST(BM_spin_empty)->ThreadPerCpu();
void BM_spin_pause_before(benchmark::State& state) {
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
while(state.KeepRunning()) {
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
}
}
@ -46,13 +42,11 @@ void BM_spin_pause_during(benchmark::State& state) {
while(state.KeepRunning()) {
state.PauseTiming();
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
state.ResumeTiming();
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
}
}
@ -63,13 +57,11 @@ BASIC_BENCHMARK_TEST(BM_spin_pause_during)->ThreadPerCpu();
void BM_spin_pause_after(benchmark::State& state) {
while(state.KeepRunning()) {
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
}
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
}
BASIC_BENCHMARK_TEST(BM_spin_pause_after);
@ -78,18 +70,15 @@ BASIC_BENCHMARK_TEST(BM_spin_pause_after)->ThreadPerCpu();
void BM_spin_pause_before_and_after(benchmark::State& state) {
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
while(state.KeepRunning()) {
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
}
for (int i = 0; i < state.range_x(); ++i) {
volatile int dummy = i;
((void)dummy);
benchmark::DoNotOptimize(i);
}
}
BASIC_BENCHMARK_TEST(BM_spin_pause_before_and_after);