06719ae42f
Make sure it is faster than std::to_value(). And it is, by ~30% for the normal use case, and much faster when close to the double limits. util::dtoa also offers a much better precision.
67 lines
1.6 KiB
C++
67 lines
1.6 KiB
C++
#include <benchmark/benchmark.h>
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#include <mbgl/util/dtoa.hpp>
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#include <cfloat>
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#include <cmath>
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using namespace mbgl;
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static void Util_dtoa(::benchmark::State& state) {
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while (state.KeepRunning()) {
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util::dtoa(0.);
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util::dtoa(M_E);
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util::dtoa(M_LOG2E);
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util::dtoa(M_LOG10E);
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util::dtoa(M_LN2);
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util::dtoa(M_LN10);
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util::dtoa(M_PI);
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util::dtoa(M_PI_2);
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util::dtoa(M_PI_4);
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util::dtoa(M_1_PI);
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util::dtoa(M_2_PI);
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util::dtoa(M_2_SQRTPI);
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util::dtoa(M_SQRT2);
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util::dtoa(M_SQRT1_2);
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}
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}
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static void Util_standardDtoa(::benchmark::State& state) {
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while (state.KeepRunning()) {
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std::to_string(0.);
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std::to_string(M_E);
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std::to_string(M_LOG2E);
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std::to_string(M_LOG10E);
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std::to_string(M_LN2);
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std::to_string(M_LN10);
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std::to_string(M_PI);
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std::to_string(M_PI_2);
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std::to_string(M_PI_4);
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std::to_string(M_1_PI);
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std::to_string(M_2_PI);
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std::to_string(M_2_SQRTPI);
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std::to_string(M_SQRT2);
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std::to_string(M_SQRT1_2);
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}
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}
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static void Util_dtoaLimits(::benchmark::State& state) {
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while (state.KeepRunning()) {
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util::dtoa(DBL_MIN);
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util::dtoa(DBL_MAX);
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}
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}
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static void Util_standardDtoaLimits(::benchmark::State& state) {
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while (state.KeepRunning()) {
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std::to_string(DBL_MIN);
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std::to_string(DBL_MAX);
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}
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}
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BENCHMARK(Util_dtoa);
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BENCHMARK(Util_standardDtoa);
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BENCHMARK(Util_dtoaLimits);
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BENCHMARK(Util_standardDtoaLimits);
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