fc8dc48020
git-subtree-dir: third_party/abseil_cpp git-subtree-mainline:ffb2ae54begit-subtree-split:768eb2ca28
286 lines
8.3 KiB
C++
286 lines
8.3 KiB
C++
// Copyright 2018 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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// https://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 <cstdint>
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#include <random>
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#include <string>
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#include <type_traits>
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#include <vector>
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#include "benchmark/benchmark.h"
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#include "absl/base/internal/raw_logging.h"
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#include "absl/random/distributions.h"
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#include "absl/random/random.h"
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#include "absl/strings/numbers.h"
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namespace {
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template <typename T>
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void BM_FastIntToBuffer(benchmark::State& state) {
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const int inc = state.range(0);
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char buf[absl::numbers_internal::kFastToBufferSize];
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// Use the unsigned type to increment to take advantage of well-defined
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// modular arithmetic.
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typename std::make_unsigned<T>::type x = 0;
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for (auto _ : state) {
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absl::numbers_internal::FastIntToBuffer(static_cast<T>(x), buf);
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x += inc;
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}
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}
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BENCHMARK_TEMPLATE(BM_FastIntToBuffer, int32_t)->Range(0, 1 << 15);
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BENCHMARK_TEMPLATE(BM_FastIntToBuffer, int64_t)->Range(0, 1 << 30);
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// Creates an integer that would be printed as `num_digits` repeated 7s in the
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// given `base`. `base` must be greater than or equal to 8.
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int64_t RepeatedSevens(int num_digits, int base) {
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ABSL_RAW_CHECK(base >= 8, "");
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int64_t num = 7;
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while (--num_digits) num = base * num + 7;
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return num;
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}
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void BM_safe_strto32_string(benchmark::State& state) {
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const int digits = state.range(0);
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const int base = state.range(1);
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std::string str(digits, '7'); // valid in octal, decimal and hex
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int32_t value = 0;
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for (auto _ : state) {
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benchmark::DoNotOptimize(
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absl::numbers_internal::safe_strto32_base(str, &value, base));
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}
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ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), "");
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}
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BENCHMARK(BM_safe_strto32_string)
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->ArgPair(1, 8)
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->ArgPair(1, 10)
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->ArgPair(1, 16)
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->ArgPair(2, 8)
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->ArgPair(2, 10)
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->ArgPair(2, 16)
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->ArgPair(4, 8)
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->ArgPair(4, 10)
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->ArgPair(4, 16)
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->ArgPair(8, 8)
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->ArgPair(8, 10)
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->ArgPair(8, 16)
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->ArgPair(10, 8)
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->ArgPair(9, 10);
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void BM_safe_strto64_string(benchmark::State& state) {
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const int digits = state.range(0);
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const int base = state.range(1);
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std::string str(digits, '7'); // valid in octal, decimal and hex
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int64_t value = 0;
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for (auto _ : state) {
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benchmark::DoNotOptimize(
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absl::numbers_internal::safe_strto64_base(str, &value, base));
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}
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ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), "");
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}
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BENCHMARK(BM_safe_strto64_string)
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->ArgPair(1, 8)
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->ArgPair(1, 10)
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->ArgPair(1, 16)
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->ArgPair(2, 8)
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->ArgPair(2, 10)
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->ArgPair(2, 16)
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->ArgPair(4, 8)
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->ArgPair(4, 10)
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->ArgPair(4, 16)
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->ArgPair(8, 8)
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->ArgPair(8, 10)
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->ArgPair(8, 16)
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->ArgPair(16, 8)
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->ArgPair(16, 10)
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->ArgPair(16, 16);
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void BM_safe_strtou32_string(benchmark::State& state) {
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const int digits = state.range(0);
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const int base = state.range(1);
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std::string str(digits, '7'); // valid in octal, decimal and hex
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uint32_t value = 0;
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for (auto _ : state) {
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benchmark::DoNotOptimize(
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absl::numbers_internal::safe_strtou32_base(str, &value, base));
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}
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ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), "");
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}
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BENCHMARK(BM_safe_strtou32_string)
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->ArgPair(1, 8)
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->ArgPair(1, 10)
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->ArgPair(1, 16)
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->ArgPair(2, 8)
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->ArgPair(2, 10)
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->ArgPair(2, 16)
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->ArgPair(4, 8)
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->ArgPair(4, 10)
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->ArgPair(4, 16)
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->ArgPair(8, 8)
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->ArgPair(8, 10)
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->ArgPair(8, 16)
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->ArgPair(10, 8)
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->ArgPair(9, 10);
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void BM_safe_strtou64_string(benchmark::State& state) {
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const int digits = state.range(0);
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const int base = state.range(1);
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std::string str(digits, '7'); // valid in octal, decimal and hex
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uint64_t value = 0;
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for (auto _ : state) {
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benchmark::DoNotOptimize(
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absl::numbers_internal::safe_strtou64_base(str, &value, base));
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}
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ABSL_RAW_CHECK(value == RepeatedSevens(digits, base), "");
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}
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BENCHMARK(BM_safe_strtou64_string)
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->ArgPair(1, 8)
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->ArgPair(1, 10)
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->ArgPair(1, 16)
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->ArgPair(2, 8)
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->ArgPair(2, 10)
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->ArgPair(2, 16)
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->ArgPair(4, 8)
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->ArgPair(4, 10)
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->ArgPair(4, 16)
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->ArgPair(8, 8)
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->ArgPair(8, 10)
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->ArgPair(8, 16)
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->ArgPair(16, 8)
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->ArgPair(16, 10)
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->ArgPair(16, 16);
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// Returns a vector of `num_strings` strings. Each string represents a
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// floating point number with `num_digits` digits before the decimal point and
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// another `num_digits` digits after.
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std::vector<std::string> MakeFloatStrings(int num_strings, int num_digits) {
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// For convenience, use a random number generator to generate the test data.
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// We don't actually need random properties, so use a fixed seed.
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std::minstd_rand0 rng(1);
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std::uniform_int_distribution<int> random_digit('0', '9');
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std::vector<std::string> float_strings(num_strings);
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for (std::string& s : float_strings) {
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s.reserve(2 * num_digits + 1);
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for (int i = 0; i < num_digits; ++i) {
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s.push_back(static_cast<char>(random_digit(rng)));
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}
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s.push_back('.');
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for (int i = 0; i < num_digits; ++i) {
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s.push_back(static_cast<char>(random_digit(rng)));
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}
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}
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return float_strings;
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}
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template <typename StringType>
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StringType GetStringAs(const std::string& s) {
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return static_cast<StringType>(s);
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}
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template <>
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const char* GetStringAs<const char*>(const std::string& s) {
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return s.c_str();
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}
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template <typename StringType>
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std::vector<StringType> GetStringsAs(const std::vector<std::string>& strings) {
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std::vector<StringType> result;
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result.reserve(strings.size());
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for (const std::string& s : strings) {
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result.push_back(GetStringAs<StringType>(s));
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}
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return result;
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}
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template <typename T>
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void BM_SimpleAtof(benchmark::State& state) {
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const int num_strings = state.range(0);
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const int num_digits = state.range(1);
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std::vector<std::string> backing_strings =
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MakeFloatStrings(num_strings, num_digits);
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std::vector<T> inputs = GetStringsAs<T>(backing_strings);
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float value;
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for (auto _ : state) {
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for (const T& input : inputs) {
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benchmark::DoNotOptimize(absl::SimpleAtof(input, &value));
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}
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}
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}
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BENCHMARK_TEMPLATE(BM_SimpleAtof, absl::string_view)
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->ArgPair(10, 1)
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->ArgPair(10, 2)
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->ArgPair(10, 4)
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->ArgPair(10, 8);
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BENCHMARK_TEMPLATE(BM_SimpleAtof, const char*)
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->ArgPair(10, 1)
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->ArgPair(10, 2)
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->ArgPair(10, 4)
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->ArgPair(10, 8);
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BENCHMARK_TEMPLATE(BM_SimpleAtof, std::string)
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->ArgPair(10, 1)
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->ArgPair(10, 2)
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->ArgPair(10, 4)
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->ArgPair(10, 8);
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template <typename T>
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void BM_SimpleAtod(benchmark::State& state) {
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const int num_strings = state.range(0);
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const int num_digits = state.range(1);
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std::vector<std::string> backing_strings =
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MakeFloatStrings(num_strings, num_digits);
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std::vector<T> inputs = GetStringsAs<T>(backing_strings);
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double value;
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for (auto _ : state) {
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for (const T& input : inputs) {
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benchmark::DoNotOptimize(absl::SimpleAtod(input, &value));
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}
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}
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}
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BENCHMARK_TEMPLATE(BM_SimpleAtod, absl::string_view)
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->ArgPair(10, 1)
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->ArgPair(10, 2)
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->ArgPair(10, 4)
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->ArgPair(10, 8);
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BENCHMARK_TEMPLATE(BM_SimpleAtod, const char*)
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->ArgPair(10, 1)
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->ArgPair(10, 2)
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->ArgPair(10, 4)
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->ArgPair(10, 8);
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BENCHMARK_TEMPLATE(BM_SimpleAtod, std::string)
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->ArgPair(10, 1)
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->ArgPair(10, 2)
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->ArgPair(10, 4)
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->ArgPair(10, 8);
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void BM_FastHexToBufferZeroPad16(benchmark::State& state) {
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absl::BitGen rng;
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std::vector<uint64_t> nums;
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nums.resize(1000);
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auto min = std::numeric_limits<uint64_t>::min();
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auto max = std::numeric_limits<uint64_t>::max();
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for (auto& num : nums) {
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num = absl::LogUniform(rng, min, max);
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}
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char buf[16];
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while (state.KeepRunningBatch(nums.size())) {
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for (auto num : nums) {
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auto digits = absl::numbers_internal::FastHexToBufferZeroPad16(num, buf);
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benchmark::DoNotOptimize(digits);
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benchmark::DoNotOptimize(buf);
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}
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}
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}
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BENCHMARK(BM_FastHexToBufferZeroPad16);
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} // namespace
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