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- /*
- * Copyright 2018-present Facebook, Inc.
- *
- * 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
- *
- * http://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 <folly/Benchmark.h>
- #include <folly/ConstexprMath.h>
- #include <glog/logging.h>
- #include <limits>
- #include <type_traits>
- template <typename ValueT>
- constexpr ValueT UBSafeAdd(ValueT a, ValueT b) {
- using UnsignedT = typename std::make_unsigned<ValueT>::type;
- return static_cast<ValueT>(
- static_cast<UnsignedT>(a) + static_cast<UnsignedT>(b));
- }
- template <typename ValueT>
- constexpr ValueT UBSafeSub(ValueT a, ValueT b) {
- using UnsignedT = typename std::make_unsigned<ValueT>::type;
- return static_cast<ValueT>(
- static_cast<UnsignedT>(a) - static_cast<UnsignedT>(b));
- }
- template <typename ValueT, typename Op>
- void Run(size_t iterations, ValueT kMin, ValueT kMax, Op&& op) {
- auto kMid = (kMin + kMax) / 2;
- for (size_t round = 0; round < iterations; round++) {
- for (ValueT a = kMin; a < kMin + 100; a++) {
- for (ValueT b = kMin; b < kMin + 100; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- for (ValueT a = kMin; a < kMin + 100; a++) {
- for (ValueT b = kMid - 50; b < kMid + 50; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- for (ValueT a = kMin; a < kMin + 100; a++) {
- for (ValueT b = kMax - 100; b < kMax; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- for (ValueT a = kMid - 50; a < kMid + 50; a++) {
- for (ValueT b = kMin; b < kMin + 100; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- for (ValueT a = kMid - 50; a < kMid + 50; a++) {
- for (ValueT b = kMid - 50; b < kMid + 50; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- for (ValueT a = kMid - 50; a < kMid + 50; a++) {
- for (ValueT b = kMax - 100; b < kMax; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- for (ValueT a = kMax - 100; a < kMax; a++) {
- for (ValueT b = kMin; b < kMin + 100; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- for (ValueT a = kMax - 100; a < kMax; a++) {
- for (ValueT b = kMid - 50; b < kMid + 50; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- for (ValueT a = kMax - 100; a < kMax; a++) {
- for (ValueT b = kMax - 100; b < kMax; b++) {
- auto a1 = a, b1 = b;
- folly::makeUnpredictable(a1);
- folly::makeUnpredictable(b1);
- ValueT c = op(a1, b1);
- folly::doNotOptimizeAway(c);
- }
- }
- }
- }
- template <typename ValueT>
- void Add(size_t iterations, ValueT kMin, ValueT kMax) {
- Run<ValueT>(iterations, kMin, kMax, [](ValueT a, ValueT b) {
- return UBSafeAdd(a, b);
- });
- }
- template <typename ValueT>
- void NoOverflowAdd(size_t iterations, ValueT kMin, ValueT kMax) {
- Run<ValueT>(iterations, kMin, kMax, [](ValueT a, ValueT b) {
- return folly::constexpr_add_overflow_clamped(a, b);
- });
- }
- template <typename ValueT>
- void Sub(size_t iterations, ValueT kMin, ValueT kMax) {
- Run<ValueT>(iterations, kMin, kMax, [](ValueT a, ValueT b) {
- return UBSafeSub(a, b);
- });
- }
- template <typename ValueT>
- void NoOverflowSub(size_t iterations, ValueT kMin, ValueT kMax) {
- Run<ValueT>(iterations, kMin, kMax, [](ValueT a, ValueT b) {
- return folly::constexpr_sub_overflow_clamped(a, b);
- });
- }
- #define GENERATE_BENCHMARKS_FOR_TYPE(ValueT) \
- BENCHMARK_NAMED_PARAM( \
- Add, \
- ValueT, \
- std::numeric_limits<ValueT>::min(), \
- std::numeric_limits<ValueT>::max()) \
- BENCHMARK_RELATIVE_NAMED_PARAM( \
- NoOverflowAdd, \
- ValueT, \
- std::numeric_limits<ValueT>::min(), \
- std::numeric_limits<ValueT>::max()) \
- BENCHMARK_NAMED_PARAM( \
- Sub, \
- ValueT, \
- std::numeric_limits<ValueT>::min(), \
- std::numeric_limits<ValueT>::max()) \
- BENCHMARK_RELATIVE_NAMED_PARAM( \
- NoOverflowSub, \
- ValueT, \
- std::numeric_limits<ValueT>::min(), \
- std::numeric_limits<ValueT>::max())
- GENERATE_BENCHMARKS_FOR_TYPE(int8_t)
- BENCHMARK_DRAW_LINE();
- GENERATE_BENCHMARKS_FOR_TYPE(uint8_t)
- BENCHMARK_DRAW_LINE();
- GENERATE_BENCHMARKS_FOR_TYPE(int16_t)
- BENCHMARK_DRAW_LINE();
- GENERATE_BENCHMARKS_FOR_TYPE(uint16_t)
- BENCHMARK_DRAW_LINE();
- GENERATE_BENCHMARKS_FOR_TYPE(int32_t)
- BENCHMARK_DRAW_LINE();
- GENERATE_BENCHMARKS_FOR_TYPE(uint32_t)
- BENCHMARK_DRAW_LINE();
- GENERATE_BENCHMARKS_FOR_TYPE(int64_t)
- BENCHMARK_DRAW_LINE();
- GENERATE_BENCHMARKS_FOR_TYPE(uint64_t)
- int main(int argc, char** argv) {
- gflags::ParseCommandLineFlags(&argc, &argv, true);
- folly::runBenchmarks();
- return 0;
- }
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