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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 <cstdint>
#include <cstddef>
#include <functional>
#include "benchmark/benchmark.h"
#include "GenerateInput.h"
#include "test_macros.h"
constexpr std::size_t TestNumInputs = 1024;
template <class HashFn, class GenInputs>
void BM_Hash(benchmark::State& st, HashFn fn, GenInputs gen) {
auto in = gen(st.range(0));
const auto end = in.data() + in.size();
std::size_t last_hash = 0;
benchmark::DoNotOptimize(&last_hash);
while (st.KeepRunning()) {
for (auto it = in.data(); it != end; ++it) {
benchmark::DoNotOptimize(last_hash += fn(*it));
}
benchmark::ClobberMemory();
}
}
BENCHMARK_CAPTURE(BM_Hash, uint32_random_std_hash, std::hash<uint32_t>{}, getRandomIntegerInputs<uint32_t>)
->Arg(TestNumInputs);
BENCHMARK_CAPTURE(BM_Hash, uint32_top_std_hash, std::hash<uint32_t>{}, getSortedTopBitsIntegerInputs<uint32_t>)
->Arg(TestNumInputs);
BENCHMARK_MAIN();
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