| // Copyright 2018 The Abseil Authors. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // https://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include <cstdint> |
| #include <random> |
| #include <string> |
| #include <type_traits> |
| #include <vector> |
| |
| #include "benchmark/benchmark.h" |
| #include "absl/base/internal/raw_logging.h" |
| #include "absl/strings/numbers.h" |
| |
| namespace { |
| |
| template <typename T> |
| void BM_FastIntToBuffer(benchmark::State& state) { |
| const int inc = state.range(0); |
| char buf[absl::numbers_internal::kFastToBufferSize]; |
| // Use the unsigned type to increment to take advantage of well-defined |
| // modular arithmetic. |
| typename std::make_unsigned<T>::type x = 0; |
| for (auto _ : state) { |
| absl::numbers_internal::FastIntToBuffer(static_cast<T>(x), buf); |
| x += inc; |
| } |
| } |
| BENCHMARK_TEMPLATE(BM_FastIntToBuffer, int32_t)->Range(0, 1 << 15); |
| BENCHMARK_TEMPLATE(BM_FastIntToBuffer, int64_t)->Range(0, 1 << 30); |
| |
| // Creates an integer that would be printed as `num_digits` repeated 7s in the |
| // given `base`. `base` must be greater than or equal to 8. |
| int64_t RepeatedSevens(int num_digits, int base) { |
| ABSL_RAW_CHECK(base >= 8, ""); |
| int64_t num = 7; |
| while (--num_digits) num = base * num + 7; |
| return num; |
| } |
| |
| void BM_safe_strto32_string(benchmark::State& state) { |
| const int digits = state.range(0); |
| const int base = state.range(1); |
| std::string str(digits, '7'); // valid in octal, decimal and hex |
| int32_t value = 0; |
| for (auto _ : state) { |
| benchmark::DoNotOptimize( |
| absl::numbers_internal::safe_strto32_base(str, &value, base)); |
| } |
| ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), ""); |
| } |
| BENCHMARK(BM_safe_strto32_string) |
| ->ArgPair(1, 8) |
| ->ArgPair(1, 10) |
| ->ArgPair(1, 16) |
| ->ArgPair(2, 8) |
| ->ArgPair(2, 10) |
| ->ArgPair(2, 16) |
| ->ArgPair(4, 8) |
| ->ArgPair(4, 10) |
| ->ArgPair(4, 16) |
| ->ArgPair(8, 8) |
| ->ArgPair(8, 10) |
| ->ArgPair(8, 16) |
| ->ArgPair(10, 8) |
| ->ArgPair(9, 10); |
| |
| void BM_safe_strto64_string(benchmark::State& state) { |
| const int digits = state.range(0); |
| const int base = state.range(1); |
| std::string str(digits, '7'); // valid in octal, decimal and hex |
| int64_t value = 0; |
| for (auto _ : state) { |
| benchmark::DoNotOptimize( |
| absl::numbers_internal::safe_strto64_base(str, &value, base)); |
| } |
| ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), ""); |
| } |
| BENCHMARK(BM_safe_strto64_string) |
| ->ArgPair(1, 8) |
| ->ArgPair(1, 10) |
| ->ArgPair(1, 16) |
| ->ArgPair(2, 8) |
| ->ArgPair(2, 10) |
| ->ArgPair(2, 16) |
| ->ArgPair(4, 8) |
| ->ArgPair(4, 10) |
| ->ArgPair(4, 16) |
| ->ArgPair(8, 8) |
| ->ArgPair(8, 10) |
| ->ArgPair(8, 16) |
| ->ArgPair(16, 8) |
| ->ArgPair(16, 10) |
| ->ArgPair(16, 16); |
| |
| void BM_safe_strtou32_string(benchmark::State& state) { |
| const int digits = state.range(0); |
| const int base = state.range(1); |
| std::string str(digits, '7'); // valid in octal, decimal and hex |
| uint32_t value = 0; |
| for (auto _ : state) { |
| benchmark::DoNotOptimize( |
| absl::numbers_internal::safe_strtou32_base(str, &value, base)); |
| } |
| ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), ""); |
| } |
| BENCHMARK(BM_safe_strtou32_string) |
| ->ArgPair(1, 8) |
| ->ArgPair(1, 10) |
| ->ArgPair(1, 16) |
| ->ArgPair(2, 8) |
| ->ArgPair(2, 10) |
| ->ArgPair(2, 16) |
| ->ArgPair(4, 8) |
| ->ArgPair(4, 10) |
| ->ArgPair(4, 16) |
| ->ArgPair(8, 8) |
| ->ArgPair(8, 10) |
| ->ArgPair(8, 16) |
| ->ArgPair(10, 8) |
| ->ArgPair(9, 10); |
| |
| void BM_safe_strtou64_string(benchmark::State& state) { |
| const int digits = state.range(0); |
| const int base = state.range(1); |
| std::string str(digits, '7'); // valid in octal, decimal and hex |
| uint64_t value = 0; |
| for (auto _ : state) { |
| benchmark::DoNotOptimize( |
| absl::numbers_internal::safe_strtou64_base(str, &value, base)); |
| } |
| ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), ""); |
| } |
| BENCHMARK(BM_safe_strtou64_string) |
| ->ArgPair(1, 8) |
| ->ArgPair(1, 10) |
| ->ArgPair(1, 16) |
| ->ArgPair(2, 8) |
| ->ArgPair(2, 10) |
| ->ArgPair(2, 16) |
| ->ArgPair(4, 8) |
| ->ArgPair(4, 10) |
| ->ArgPair(4, 16) |
| ->ArgPair(8, 8) |
| ->ArgPair(8, 10) |
| ->ArgPair(8, 16) |
| ->ArgPair(16, 8) |
| ->ArgPair(16, 10) |
| ->ArgPair(16, 16); |
| |
| // Returns a vector of `num_strings` strings. Each string represents a |
| // floating point number with `num_digits` digits before the decimal point and |
| // another `num_digits` digits after. |
| std::vector<std::string> MakeFloatStrings(int num_strings, int num_digits) { |
| // For convenience, use a random number generator to generate the test data. |
| // We don't actually need random properties, so use a fixed seed. |
| std::minstd_rand0 rng(1); |
| std::uniform_int_distribution<int> random_digit('0', '9'); |
| |
| std::vector<std::string> float_strings(num_strings); |
| for (std::string& s : float_strings) { |
| s.reserve(2 * num_digits + 1); |
| for (int i = 0; i < num_digits; ++i) { |
| s.push_back(static_cast<char>(random_digit(rng))); |
| } |
| s.push_back('.'); |
| for (int i = 0; i < num_digits; ++i) { |
| s.push_back(static_cast<char>(random_digit(rng))); |
| } |
| } |
| return float_strings; |
| } |
| |
| template <typename StringType> |
| StringType GetStringAs(const std::string& s) { |
| return static_cast<StringType>(s); |
| } |
| template <> |
| const char* GetStringAs<const char*>(const std::string& s) { |
| return s.c_str(); |
| } |
| |
| template <typename StringType> |
| std::vector<StringType> GetStringsAs(const std::vector<std::string>& strings) { |
| std::vector<StringType> result; |
| result.reserve(strings.size()); |
| for (const std::string& s : strings) { |
| result.push_back(GetStringAs<StringType>(s)); |
| } |
| return result; |
| } |
| |
| template <typename T> |
| void BM_SimpleAtof(benchmark::State& state) { |
| const int num_strings = state.range(0); |
| const int num_digits = state.range(1); |
| std::vector<std::string> backing_strings = |
| MakeFloatStrings(num_strings, num_digits); |
| std::vector<T> inputs = GetStringsAs<T>(backing_strings); |
| float value; |
| for (auto _ : state) { |
| for (const T& input : inputs) { |
| benchmark::DoNotOptimize(absl::SimpleAtof(input, &value)); |
| } |
| } |
| } |
| BENCHMARK_TEMPLATE(BM_SimpleAtof, absl::string_view) |
| ->ArgPair(10, 1) |
| ->ArgPair(10, 2) |
| ->ArgPair(10, 4) |
| ->ArgPair(10, 8); |
| BENCHMARK_TEMPLATE(BM_SimpleAtof, const char*) |
| ->ArgPair(10, 1) |
| ->ArgPair(10, 2) |
| ->ArgPair(10, 4) |
| ->ArgPair(10, 8); |
| BENCHMARK_TEMPLATE(BM_SimpleAtof, std::string) |
| ->ArgPair(10, 1) |
| ->ArgPair(10, 2) |
| ->ArgPair(10, 4) |
| ->ArgPair(10, 8); |
| |
| template <typename T> |
| void BM_SimpleAtod(benchmark::State& state) { |
| const int num_strings = state.range(0); |
| const int num_digits = state.range(1); |
| std::vector<std::string> backing_strings = |
| MakeFloatStrings(num_strings, num_digits); |
| std::vector<T> inputs = GetStringsAs<T>(backing_strings); |
| double value; |
| for (auto _ : state) { |
| for (const T& input : inputs) { |
| benchmark::DoNotOptimize(absl::SimpleAtod(input, &value)); |
| } |
| } |
| } |
| BENCHMARK_TEMPLATE(BM_SimpleAtod, absl::string_view) |
| ->ArgPair(10, 1) |
| ->ArgPair(10, 2) |
| ->ArgPair(10, 4) |
| ->ArgPair(10, 8); |
| BENCHMARK_TEMPLATE(BM_SimpleAtod, const char*) |
| ->ArgPair(10, 1) |
| ->ArgPair(10, 2) |
| ->ArgPair(10, 4) |
| ->ArgPair(10, 8); |
| BENCHMARK_TEMPLATE(BM_SimpleAtod, std::string) |
| ->ArgPair(10, 1) |
| ->ArgPair(10, 2) |
| ->ArgPair(10, 4) |
| ->ArgPair(10, 8); |
| |
| } // namespace |