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1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9// UNSUPPORTED: c++03, c++11, c++14, c++1710 11#include <algorithm>12#include <cstddef>13#include <deque>14#include <list>15#include <string>16#include <vector>17 18#include <benchmark/benchmark.h>19#include "../../GenerateInput.h"20 21int main(int argc, char** argv) {22  auto std_adjacent_find      = [](auto first, auto last) { return std::adjacent_find(first, last); };23  auto std_adjacent_find_pred = [](auto first, auto last) {24    return std::adjacent_find(first, last, [](auto x, auto y) {25      benchmark::DoNotOptimize(x);26      benchmark::DoNotOptimize(y);27      return x == y;28    });29  };30  auto ranges_adjacent_find_pred = [](auto first, auto last) {31    return std::ranges::adjacent_find(first, last, [](auto x, auto y) {32      benchmark::DoNotOptimize(x);33      benchmark::DoNotOptimize(y);34      return x == y;35    });36  };37 38  // Benchmark {std,ranges}::adjacent_find on a sequence of the form xyxyxyxyxyxyxyxyxyxy,39  // which means we never find adjacent equal elements (the worst case of the algorithm).40  {41    auto bm = []<class Container>(std::string name, auto adjacent_find) {42      benchmark::RegisterBenchmark(43          name,44          [adjacent_find](auto& st) {45            std::size_t const size = st.range(0);46            using ValueType        = typename Container::value_type;47            ValueType x            = Generate<ValueType>::random();48            ValueType y            = random_different_from({x});49            Container c;50            for (std::size_t i = 0; i != size; ++i) {51              c.push_back(i % 2 == 0 ? x : y);52            }53 54            for ([[maybe_unused]] auto _ : st) {55              benchmark::DoNotOptimize(c);56              auto result = adjacent_find(c.begin(), c.end());57              benchmark::DoNotOptimize(result);58            }59          })60          ->Arg(8)61          ->Arg(50) // non power-of-two62          ->Arg(1024)63          ->Arg(8192)64          ->Arg(1 << 20);65    };66 67    // {std,ranges}::adjacent_find68    bm.operator()<std::vector<int>>("std::adjacent_find(vector<int>)", std_adjacent_find);69    bm.operator()<std::deque<int>>("std::adjacent_find(deque<int>)", std_adjacent_find);70    bm.operator()<std::list<int>>("std::adjacent_find(list<int>)", std_adjacent_find);71    bm.operator()<std::vector<int>>("rng::adjacent_find(vector<int>)", std::ranges::adjacent_find);72    bm.operator()<std::deque<int>>("rng::adjacent_find(deque<int>)", std::ranges::adjacent_find);73    bm.operator()<std::list<int>>("rng::adjacent_find(list<int>)", std::ranges::adjacent_find);74 75    // {std,ranges}::adjacent_find(pred)76    bm.operator()<std::vector<int>>("std::adjacent_find(vector<int>, pred)", std_adjacent_find_pred);77    bm.operator()<std::deque<int>>("std::adjacent_find(deque<int>, pred)", std_adjacent_find_pred);78    bm.operator()<std::list<int>>("std::adjacent_find(list<int>, pred)", std_adjacent_find_pred);79    bm.operator()<std::vector<int>>("rng::adjacent_find(vector<int>, pred)", ranges_adjacent_find_pred);80    bm.operator()<std::deque<int>>("rng::adjacent_find(deque<int>, pred)", ranges_adjacent_find_pred);81    bm.operator()<std::list<int>>("rng::adjacent_find(list<int>, pred)", ranges_adjacent_find_pred);82  }83 84  benchmark::Initialize(&argc, argv);85  benchmark::RunSpecifiedBenchmarks();86  benchmark::Shutdown();87  return 0;88}89