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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++17, c++2010 11#include <algorithm>12#include <cstddef>13#include <deque>14#include <iterator>15#include <list>16#include <string>17#include <type_traits>18#include <vector>19 20#include <benchmark/benchmark.h>21#include "../../GenerateInput.h"22 23int main(int argc, char** argv) {24  // ranges::{fold_left,fold_right}25  {26    auto bm = []<class Container>(std::string name, auto fold) {27      benchmark::RegisterBenchmark(28          name,29          [fold](auto& st) {30            std::size_t const size = st.range(0);31            using ValueType        = typename Container::value_type;32            static_assert(std::is_unsigned_v<ValueType>,33                          "We could encounter UB if signed arithmetic overflows in this benchmark");34 35            Container c;36            std::generate_n(std::back_inserter(c), size, [&] { return Generate<ValueType>::random(); });37            ValueType init = c.back();38            c.pop_back();39 40            auto f = [](auto x, auto y) {41              benchmark::DoNotOptimize(x);42              benchmark::DoNotOptimize(y);43              return x + y;44            };45 46            for ([[maybe_unused]] auto _ : st) {47              benchmark::DoNotOptimize(c);48              benchmark::DoNotOptimize(init);49              auto result = fold(c.begin(), c.end(), init, f);50              benchmark::DoNotOptimize(result);51            }52          })53          ->Arg(8)54          ->Arg(32)55          ->Arg(50) // non power-of-two56          ->Arg(8192)57          ->Arg(1 << 20);58    };59    bm.operator()<std::vector<unsigned int>>("rng::fold_left(vector<int>)", std::ranges::fold_left);60    bm.operator()<std::deque<unsigned int>>("rng::fold_left(deque<int>)", std::ranges::fold_left);61    bm.operator()<std::list<unsigned int>>("rng::fold_left(list<int>)", std::ranges::fold_left);62 63    // TODO: fold_right not implemented yet64    // bm.operator()<std::vector<unsigned int>>("rng::fold_right(vector<int>)", std::ranges::fold_right);65    // bm.operator()<std::deque<unsigned int>>("rng::fold_right(deque<int>)", std::ranges::fold_right);66    // bm.operator()<std::list<unsigned int>>("rng::fold_right(list<int>)", std::ranges::fold_right);67  }68 69  benchmark::Initialize(&argc, argv);70  benchmark::RunSpecifiedBenchmarks();71  benchmark::Shutdown();72  return 0;73}74