Use STL algorithms available since C++14 to implement absl::equal and

absl::rotate.

Prior to C++14 these were either polyfills or fixes for bugs in
standard libraries.

PiperOrigin-RevId: 575295101
Change-Id: Ie01e77fedadc879c73203d71babd40c87a419af3

1 files changed, 0 insertions, 126 deletions

diff --git a/absl/algorithm/equal_benchmark.cc b/absl/algorithm/equal_benchmark.cc
deleted file mode 100644
index 948cd65c..00000000
--- a/absl/algorithm/equal_benchmark.cc
+++ /dev/null
@@ -1,126 +0,0 @@
-// Copyright 2017 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 <cstring>
-
-#include "absl/algorithm/algorithm.h"
-#include "benchmark/benchmark.h"
-
-namespace {
-
-// The range of sequence sizes to benchmark.
-constexpr int kMinBenchmarkSize = 1024;
-constexpr int kMaxBenchmarkSize = 8 * 1024 * 1024;
-
-// A user-defined type for use in equality benchmarks. Note that we expect
-// std::memcmp to win for this type: libstdc++'s std::equal only defers to
-// memcmp for integral types. This is because it is not straightforward to
-// guarantee that std::memcmp would produce a result "as-if" compared by
-// operator== for other types (example gotchas: NaN floats, structs with
-// padding).
-struct EightBits {
-  explicit EightBits(int /* unused */) : data(0) {}
-  bool operator==(const EightBits& rhs) const { return data == rhs.data; }
-  uint8_t data;
-};
-
-template <typename T>
-void BM_absl_equal_benchmark(benchmark::State& state) {
-  std::vector<T> xs(state.range(0), T(0));
-  std::vector<T> ys = xs;
-  while (state.KeepRunning()) {
-    const bool same = absl::equal(xs.begin(), xs.end(), ys.begin(), ys.end());
-    benchmark::DoNotOptimize(same);
-  }
-}
-
-template <typename T>
-void BM_std_equal_benchmark(benchmark::State& state) {
-  std::vector<T> xs(state.range(0), T(0));
-  std::vector<T> ys = xs;
-  while (state.KeepRunning()) {
-    const bool same = std::equal(xs.begin(), xs.end(), ys.begin());
-    benchmark::DoNotOptimize(same);
-  }
-}
-
-template <typename T>
-void BM_memcmp_benchmark(benchmark::State& state) {
-  std::vector<T> xs(state.range(0), T(0));
-  std::vector<T> ys = xs;
-  while (state.KeepRunning()) {
-    const bool same =
-        std::memcmp(xs.data(), ys.data(), xs.size() * sizeof(T)) == 0;
-    benchmark::DoNotOptimize(same);
-  }
-}
-
-// The expectation is that the compiler should be able to elide the equality
-// comparison altogether for sufficiently simple types.
-template <typename T>
-void BM_absl_equal_self_benchmark(benchmark::State& state) {
-  std::vector<T> xs(state.range(0), T(0));
-  while (state.KeepRunning()) {
-    const bool same = absl::equal(xs.begin(), xs.end(), xs.begin(), xs.end());
-    benchmark::DoNotOptimize(same);
-  }
-}
-
-BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint8_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint8_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint8_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint8_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-
-BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint16_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint16_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint16_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint16_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-
-BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint32_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint32_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint32_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint32_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-
-BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, uint64_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_std_equal_benchmark, uint64_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_memcmp_benchmark, uint64_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, uint64_t)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-
-BENCHMARK_TEMPLATE(BM_absl_equal_benchmark, EightBits)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_std_equal_benchmark, EightBits)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_memcmp_benchmark, EightBits)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-BENCHMARK_TEMPLATE(BM_absl_equal_self_benchmark, EightBits)
-    ->Range(kMinBenchmarkSize, kMaxBenchmarkSize);
-
-}  // namespace