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llvm-project/libcxx/test/benchmarks/format/formatter_float.bench.cpp
Nikolas Klauser c7cd15fcdd
[libc++] Refactor formatter_float.bench.cpp and drop some benchmarks (#178886) 
`formatter_float.bench.cpp` currently benchmarks the floating point
formatting very extensively. This patch reduces the number of benchmarks
by removing some of the cases that are relatively meaningless.
The benchmark is also converted to the more recent style of benchmarks.
As a nice side-effect, this reduces the time it takes to compile the
benchmark by ~20x.

We may be able to drop more benchmarks, but I'm not an expert here and
am rather conservative here for that reason.
2026-02-03 11:14:50 +01:00

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14, c++17
#include <format>
#include <array>
#include <bit>
#include <cmath>
#include <limits>
#include <random>
#include <string>
#include "benchmark/benchmark.h"
template <class>
inline constexpr std::string to_string = "";
template <>
inline constexpr std::string to_string<float> = "float";
template <>
inline constexpr std::string to_string<double> = "double";
enum class ValueE { Inf, Random };
int main(int argc, char** argv) {
auto bm = []<class FloatingPoint>(std::type_identity<FloatingPoint>, ValueE v, std::string fmt) {
benchmark::RegisterBenchmark(
"std::format(" + to_string<FloatingPoint> + ") (fmt: " + fmt + ")", [fmt, v](benchmark::State& state) {
std::array<FloatingPoint, 1000> data = [&] {
std::array<FloatingPoint, 1000> result;
if (v == ValueE::Inf) {
std::fill(result.begin(), result.end(), -std::numeric_limits<FloatingPoint>::infinity());
} else {
std::mt19937 generator(123456);
std::uniform_int_distribution<
std::conditional_t<sizeof(FloatingPoint) == sizeof(uint32_t), uint32_t, uint64_t>>
distribution;
std::generate(result.begin(), result.end(), [&] {
while (true) {
auto val = std::bit_cast<FloatingPoint>(distribution(generator));
if (std::isfinite(val))
return val;
}
});
}
return result;
}();
std::array<char, 20'000> output;
while (state.KeepRunningBatch(1000))
for (auto value : data)
benchmark::DoNotOptimize(std::vformat_to(output.begin(), fmt, std::make_format_args(value)));
});
};
bm(std::type_identity<float>(), ValueE::Inf, "{:.0}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0}");
bm(std::type_identity<float>(), ValueE::Inf, "{:0<17500.0}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0}");
bm(std::type_identity<float>(), ValueE::Inf, "{:0^17500.0}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0}");
bm(std::type_identity<float>(), ValueE::Inf, "{:0>17500.0}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0}");
bm(std::type_identity<float>(), ValueE::Inf, "{:017500.0}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10}");
bm(std::type_identity<float>(), ValueE::Random, "{:.17000}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.17000}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.17000}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.17000}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.17000}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0L}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0L}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10L}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10L}");
bm(std::type_identity<float>(), ValueE::Random, "{:.17000L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.17000L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.17000L}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.17000L}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.17000L}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0a}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0a}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0a}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0a}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0a}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10a}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10a}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10a}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10a}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10a}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0La}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0La}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0La}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0La}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0La}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10La}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10La}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10La}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10La}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10La}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0e}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0e}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0e}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0e}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0e}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10e}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10e}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10e}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10e}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10e}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10Le}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0f}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0f}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0f}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0f}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0f}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10f}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10f}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10f}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10f}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10f}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10Lf}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0g}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0g}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0g}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0g}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0g}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10g}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10g}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10g}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10g}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10g}");
bm(std::type_identity<float>(), ValueE::Random, "{:.0Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.0Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.0Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.0Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.0Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:.10Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:0<17500.10Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:0^17500.10Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:0>17500.10Lg}");
bm(std::type_identity<float>(), ValueE::Random, "{:017500.10Lg}");
bm(std::type_identity<double>(), ValueE::Inf, "{:.0}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0}");
bm(std::type_identity<double>(), ValueE::Inf, "{:0<17500.0}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0}");
bm(std::type_identity<double>(), ValueE::Inf, "{:0^17500.0}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0}");
bm(std::type_identity<double>(), ValueE::Inf, "{:0>17500.0}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0}");
bm(std::type_identity<double>(), ValueE::Inf, "{:017500.0}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10}");
bm(std::type_identity<double>(), ValueE::Random, "{:.17000}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.17000}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.17000}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.17000}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.17000}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0L}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0L}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10L}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10L}");
bm(std::type_identity<double>(), ValueE::Random, "{:.17000L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.17000L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.17000L}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.17000L}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.17000L}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0a}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0a}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0a}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0a}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0a}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10a}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10a}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10a}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10a}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10a}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0La}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0La}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0La}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0La}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0La}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10La}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10La}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10La}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10La}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10La}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0e}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0e}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0e}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0e}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0e}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10e}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10e}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10e}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10e}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10e}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10Le}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0f}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0f}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0f}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0f}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0f}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10f}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10f}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10f}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10f}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10f}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10Lf}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0g}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0g}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0g}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0g}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0g}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10g}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10g}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10g}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10g}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10g}");
bm(std::type_identity<double>(), ValueE::Random, "{:.0Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.0Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.0Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.0Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.0Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:.10Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:0<17500.10Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:0^17500.10Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:0>17500.10Lg}");
bm(std::type_identity<double>(), ValueE::Random, "{:017500.10Lg}");
benchmark::Initialize(&argc, argv);
benchmark::RunSpecifiedBenchmarks();
benchmark::Shutdown();
return 0;
}
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