#include #include #include #include #include #include #include static constexpr frozen::unordered_map Keywords{ {"auto", "keyword"}, {"break", "keyword"}, {"case", "keyword"}, {"char", "keyword"}, {"const", "keyword"}, {"continue", "keyword"}, {"default", "keyword"}, {"do", "keyword"}, {"double", "keyword"}, {"else", "keyword"}, {"enum", "keyword"}, {"extern", "keyword"}, {"float", "keyword"}, {"for", "keyword"}, {"goto", "keyword"}, {"if", "keyword"}, {"int", "keyword"}, {"long", "keyword"}, {"register", "keyword"}, {"return", "keyword"}, {"short", "keyword"}, {"signed", "keyword"}, {"sizeof", "keyword"}, {"static", "keyword"}, {"struct", "keyword"}, {"switch", "keyword"}, {"typedef", "keyword"}, {"union", "keyword"}, {"unsigned", "keyword"}, {"void", "keyword"}, {"volatile", "keyword"}, {"while", "keyword"} }; static auto const *volatile Some = &Keywords; static void BM_StrInFzUnorderedMap(benchmark::State &state) { for (auto _ : state) { for (auto kw : *Some) { volatile bool status = Keywords.count(kw.first); benchmark::DoNotOptimize(status); } } } BENCHMARK(BM_StrInFzUnorderedMap); static const std::unordered_map Keywords_(Keywords.begin(), Keywords.end()); static void BM_StrInStdUnorderedMap(benchmark::State &state) { for (auto _ : state) { for (auto kw : *Some) { volatile bool status = Keywords_.count(kw.first); benchmark::DoNotOptimize(status); } } } BENCHMARK(BM_StrInStdUnorderedMap); static const frozen::string SomeStrings[32] = { "auto0", "break0", "case0", "char0", "const0", "continue0", "default0", "do0", "double0", "else0", "enum0", "extern0", "float0", "for0", "goto0", "if0", "int0", "long0", "register0", "return0", "short0", "signed0", "sizeof0", "static0", "struct0", "switch0", "typedef0", "union0", "unsigned0", "void0", "volatile0", "while0"}; static auto const *volatile SomeStringsPtr = &SomeStrings; static void BM_StrNotInFzUnorderedMap(benchmark::State &state) { for (auto _ : state) { for (auto kw : *SomeStringsPtr) { volatile bool status = Keywords.count(kw); benchmark::DoNotOptimize(status); } } } BENCHMARK(BM_StrNotInFzUnorderedMap); static void BM_StrNotInStdUnorderedMap(benchmark::State &state) { for (auto _ : state) { for (auto kw : *SomeStringsPtr) { volatile bool status = Keywords_.count(kw); benchmark::DoNotOptimize(status); } } } BENCHMARK(BM_StrNotInStdUnorderedMap);