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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
#include <array>
#include <benchmark/benchmark.h>
#include <cstring>
#include <numeric>
#include <random>
template <class T>
static std::array<T, 1000> generate(std::uniform_int_distribution<T> distribution = std::uniform_int_distribution<T>{
std::numeric_limits<T>::min() + 1, std::numeric_limits<T>::max()}) {
std::mt19937 generator;
std::array<T, 1000> result;
std::generate_n(result.begin(), result.size(), [&] { return distribution(generator); });
return result;
}
static void bm_gcd_random(benchmark::State& state) {
std::array data = generate<int>();
while (state.KeepRunningBatch(data.size() * data.size()))
for (auto v0 : data)
for (auto v1 : data)
benchmark::DoNotOptimize(std::gcd(v0, v1));
}
BENCHMARK(bm_gcd_random);
static void bm_gcd_trivial(benchmark::State& state) {
int lhs = ~static_cast<int>(0), rhs = 1;
for (auto _ : state) {
benchmark::DoNotOptimize(lhs);
benchmark::DoNotOptimize(rhs);
benchmark::DoNotOptimize(std::gcd(lhs, rhs));
}
}
BENCHMARK(bm_gcd_trivial);
static void bm_gcd_complex(benchmark::State& state) {
long long lhs = 2971215073;
long long rhs = 1836311903;
for (auto _ : state) {
benchmark::DoNotOptimize(lhs);
benchmark::DoNotOptimize(rhs);
benchmark::DoNotOptimize(std::gcd(lhs, rhs));
}
}
BENCHMARK(bm_gcd_complex);
BENCHMARK_MAIN();
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