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09a8440b45
PR-URL: https://github.com/nodejs/node/pull/51362 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Rafael Gonzaga <rafael.nunu@hotmail.com>
58 lines
1.9 KiB
C++
58 lines
1.9 KiB
C++
// Copyright 2020 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <cstdint>
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#include "benchmark/benchmark.h"
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#include "absl/log/check.h"
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#include "absl/strings/charset.h"
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namespace {
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absl::CharSet MakeBenchmarkMap() {
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absl::CharSet m;
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uint32_t x[] = {0x0, 0x1, 0x2, 0x3, 0xf, 0xe, 0xd, 0xc};
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for (uint32_t& t : x) t *= static_cast<uint32_t>(0x11111111UL);
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for (uint32_t i = 0; i < 256; ++i) {
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if ((x[i / 32] >> (i % 32)) & 1) m = m | absl::CharSet::Char(i);
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}
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return m;
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}
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// Micro-benchmark for Charmap::contains.
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static void BM_Contains(benchmark::State& state) {
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// Loop-body replicated 10 times to increase time per iteration.
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// Argument continuously changed to avoid generating common subexpressions.
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// Final CHECK used to discourage unwanted optimization.
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const absl::CharSet benchmark_map = MakeBenchmarkMap();
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unsigned char c = 0;
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int ops = 0;
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for (auto _ : state) {
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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ops += benchmark_map.contains(c++);
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}
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CHECK_NE(ops, -1);
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}
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BENCHMARK(BM_Contains);
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} // namespace
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