fbde9240e9
This patch removes some of the benchmarks in our suite that are
relatively low value. Specifically:
- `lexicographical_compare` isn't benchmarked with every number of
elements between 1 and 8 anymore
- `bitset` isn't benchmarked with as many sizes anymore. Instead, only
some representative sizes are benchmarked.
- `to_chars` isn't benchmarked for every possible base anymore, but only
2, 8, 10, 16 and 23 (so we have an uncommon base as well)
56 lines
1.9 KiB
C++
56 lines
1.9 KiB
C++
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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
|
|
|
|
#include <array>
|
|
#include <charconv>
|
|
#include <random>
|
|
|
|
#include "benchmark/benchmark.h"
|
|
#include "test_macros.h"
|
|
|
|
static const std::array<unsigned, 1000> input = [] {
|
|
std::mt19937 generator;
|
|
std::uniform_int_distribution<unsigned> distribution(0, std::numeric_limits<unsigned>::max());
|
|
std::array<unsigned, 1000> result;
|
|
std::generate_n(result.begin(), result.size(), [&] { return distribution(generator); });
|
|
return result;
|
|
}();
|
|
|
|
static void BM_to_chars_good(benchmark::State& state) {
|
|
char buffer[128];
|
|
int base = state.range(0);
|
|
while (state.KeepRunningBatch(input.size()))
|
|
for (auto value : input)
|
|
benchmark::DoNotOptimize(std::to_chars(buffer, &buffer[128], value, base));
|
|
}
|
|
BENCHMARK(BM_to_chars_good)->Arg(2)->Arg(8)->Arg(10)->Arg(16)->Arg(23);
|
|
|
|
static void BM_to_chars_bad(benchmark::State& state) {
|
|
char buffer[128];
|
|
int base = state.range(0);
|
|
struct sample {
|
|
unsigned size;
|
|
unsigned value;
|
|
};
|
|
std::array<sample, 1000> data;
|
|
// Assume the failure occurs, on average, halfway during the conversion.
|
|
std::transform(input.begin(), input.end(), data.begin(), [&](unsigned value) {
|
|
std::to_chars_result result = std::to_chars(buffer, &buffer[128], value, base);
|
|
return sample{unsigned((result.ptr - buffer) / 2), value};
|
|
});
|
|
|
|
while (state.KeepRunningBatch(data.size()))
|
|
for (auto element : data)
|
|
benchmark::DoNotOptimize(std::to_chars(buffer, &buffer[element.size], element.value, base));
|
|
}
|
|
BENCHMARK(BM_to_chars_bad)->Arg(2)->Arg(8)->Arg(10)->Arg(16)->Arg(23);
|
|
|
|
BENCHMARK_MAIN();
|