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62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
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// Copyright 2017 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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// http://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 "absl/strings/internal/char_map.h"
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#include <cstdint>
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#include "benchmark/benchmark.h"
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namespace {
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absl::strings_internal::Charmap MakeBenchmarkMap() {
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absl::strings_internal::Charmap 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)
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m = m | absl::strings_internal::Charmap::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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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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const absl::strings_internal::Charmap 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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benchmark::DoNotOptimize(ops);
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}
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BENCHMARK(BM_Contains);
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// We don't bother benchmarking Charmap::IsZero or Charmap::IntersectsWith;
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// their running time is data-dependent and it is not worth characterizing
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// "typical" data.
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} // namespace
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