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25acf220a4
Recently the library added a new ranged-for variant of the KeepRunning loop that is much faster. For this reason it should be preferred in all new code. Because a library, its documentation, and its tests should all embody the best practices of using the library, this patch changes all but a few usages of KeepRunning() into for (auto _ : state). The remaining usages in the tests and documentation persist only to document and test behavior that is different between the two formulations. Also note that because the range-for loop requires C++11, the KeepRunning variant has not been deprecated at this time.
75 lines
2.1 KiB
C++
75 lines
2.1 KiB
C++
#include "benchmark/benchmark.h"
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#include <cassert>
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#include <set>
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class MultipleRangesFixture : public ::benchmark::Fixture {
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public:
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MultipleRangesFixture()
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: expectedValues({{1, 3, 5},
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{1, 3, 8},
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{1, 3, 15},
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{2, 3, 5},
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{2, 3, 8},
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{2, 3, 15},
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{1, 4, 5},
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{1, 4, 8},
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{1, 4, 15},
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{2, 4, 5},
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{2, 4, 8},
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{2, 4, 15},
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{1, 7, 5},
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{1, 7, 8},
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{1, 7, 15},
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{2, 7, 5},
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{2, 7, 8},
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{2, 7, 15},
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{7, 6, 3}}) {}
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void SetUp(const ::benchmark::State& state) {
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std::vector<int> ranges = {state.range(0), state.range(1), state.range(2)};
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assert(expectedValues.find(ranges) != expectedValues.end());
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actualValues.insert(ranges);
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}
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virtual ~MultipleRangesFixture() {
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assert(actualValues.size() == expectedValues.size());
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}
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std::set<std::vector<int>> expectedValues;
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std::set<std::vector<int>> actualValues;
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};
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BENCHMARK_DEFINE_F(MultipleRangesFixture, Empty)(benchmark::State& state) {
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for (auto _ : state) {
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int product = state.range(0) * state.range(1) * state.range(2);
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for (int x = 0; x < product; x++) {
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benchmark::DoNotOptimize(x);
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}
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}
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}
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BENCHMARK_REGISTER_F(MultipleRangesFixture, Empty)
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->RangeMultiplier(2)
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->Ranges({{1, 2}, {3, 7}, {5, 15}})
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->Args({7, 6, 3});
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void BM_CheckDefaultArgument(benchmark::State& state) {
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// Test that the 'range()' without an argument is the same as 'range(0)'.
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assert(state.range() == state.range(0));
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assert(state.range() != state.range(1));
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for (auto _ : state) {
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}
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}
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BENCHMARK(BM_CheckDefaultArgument)->Ranges({{1, 5}, {6, 10}});
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static void BM_MultipleRanges(benchmark::State& st) {
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for (auto _ : st) {
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}
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}
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BENCHMARK(BM_MultipleRanges)->Ranges({{5, 5}, {6, 6}});
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BENCHMARK_MAIN()
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