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+// Copyright 2022 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 <vector>
+
+#include "benchmark/benchmark.h"
+#include "absl/base/optimization.h"
+#include "absl/numeric/bits.h"
+#include "absl/random/random.h"
+
+namespace absl {
+namespace {
+
+template <typename T>
+static void BM_bitwidth(benchmark::State& state) {
+ const int count = state.range(0);
+
+ absl::BitGen rng;
+ std::vector<T> values;
+ values.reserve(count);
+ for (int i = 0; i < count; ++i) {
+ values.push_back(absl::Uniform<T>(rng, 0, std::numeric_limits<T>::max()));
+ }
+
+ while (state.KeepRunningBatch(count)) {
+ for (int i = 0; i < count; ++i) {
+ benchmark::DoNotOptimize(values[i]);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_bitwidth, uint8_t)->Range(1, 1 << 20);
+BENCHMARK_TEMPLATE(BM_bitwidth, uint16_t)->Range(1, 1 << 20);
+BENCHMARK_TEMPLATE(BM_bitwidth, uint32_t)->Range(1, 1 << 20);
+BENCHMARK_TEMPLATE(BM_bitwidth, uint64_t)->Range(1, 1 << 20);
+
+template <typename T>
+static void BM_bitwidth_nonzero(benchmark::State& state) {
+ const int count = state.range(0);
+
+ absl::BitGen rng;
+ std::vector<T> values;
+ values.reserve(count);
+ for (int i = 0; i < count; ++i) {
+ values.push_back(absl::Uniform<T>(rng, 1, std::numeric_limits<T>::max()));
+ }
+
+ while (state.KeepRunningBatch(count)) {
+ for (int i = 0; i < count; ++i) {
+ const T value = values[i];
+ ABSL_INTERNAL_ASSUME(value > 0);
+ benchmark::DoNotOptimize(value);
+ }
+ }
+}
+BENCHMARK_TEMPLATE(BM_bitwidth_nonzero, uint8_t)->Range(1, 1 << 20);
+BENCHMARK_TEMPLATE(BM_bitwidth_nonzero, uint16_t)->Range(1, 1 << 20);
+BENCHMARK_TEMPLATE(BM_bitwidth_nonzero, uint32_t)->Range(1, 1 << 20);
+BENCHMARK_TEMPLATE(BM_bitwidth_nonzero, uint64_t)->Range(1, 1 << 20);
+
+} // namespace
+} // namespace absl