diff options
Diffstat (limited to 'absl/strings/string_view_benchmark.cc')
-rw-r--r-- | absl/strings/string_view_benchmark.cc | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/absl/strings/string_view_benchmark.cc b/absl/strings/string_view_benchmark.cc index 46909cb0..0d74e23e 100644 --- a/absl/strings/string_view_benchmark.cc +++ b/absl/strings/string_view_benchmark.cc @@ -30,6 +30,24 @@ namespace { +void BM_StringViewFromString(benchmark::State& state) { + std::string s(state.range(0), 'x'); + std::string* ps = &s; + struct SV { + SV() = default; + explicit SV(const std::string& s) : sv(s) {} + absl::string_view sv; + } sv; + SV* psv = &sv; + benchmark::DoNotOptimize(ps); + benchmark::DoNotOptimize(psv); + for (auto _ : state) { + new (psv) SV(*ps); + benchmark::DoNotOptimize(sv); + } +} +BENCHMARK(BM_StringViewFromString)->Arg(12)->Arg(128); + // Provide a forcibly out-of-line wrapper for operator== that can be used in // benchmarks to measure the impact of inlining. ABSL_ATTRIBUTE_NOINLINE @@ -142,11 +160,45 @@ void BM_CompareSame(benchmark::State& state) { absl::string_view b = y; for (auto _ : state) { + benchmark::DoNotOptimize(a); + benchmark::DoNotOptimize(b); benchmark::DoNotOptimize(a.compare(b)); } } BENCHMARK(BM_CompareSame)->DenseRange(0, 3)->Range(4, 1 << 10); +void BM_CompareFirstOneLess(benchmark::State& state) { + const int len = state.range(0); + std::string x(len, 'a'); + std::string y = x; + y.back() = 'b'; + absl::string_view a = x; + absl::string_view b = y; + + for (auto _ : state) { + benchmark::DoNotOptimize(a); + benchmark::DoNotOptimize(b); + benchmark::DoNotOptimize(a.compare(b)); + } +} +BENCHMARK(BM_CompareFirstOneLess)->DenseRange(1, 3)->Range(4, 1 << 10); + +void BM_CompareSecondOneLess(benchmark::State& state) { + const int len = state.range(0); + std::string x(len, 'a'); + std::string y = x; + x.back() = 'b'; + absl::string_view a = x; + absl::string_view b = y; + + for (auto _ : state) { + benchmark::DoNotOptimize(a); + benchmark::DoNotOptimize(b); + benchmark::DoNotOptimize(a.compare(b)); + } +} +BENCHMARK(BM_CompareSecondOneLess)->DenseRange(1, 3)->Range(4, 1 << 10); + void BM_find_string_view_len_one(benchmark::State& state) { std::string haystack(state.range(0), '0'); absl::string_view s(haystack); |