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//===- llvm/unittest/Support/ParallelTest.cpp -----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
///
/// \file
/// Parallel.h unit tests.
///
//===----------------------------------------------------------------------===//
#include "llvm/Support/Parallel.h"
#include "gtest/gtest.h"
#include <array>
#include <random>
uint32_t array[1024 * 1024];
using namespace llvm;
// Tests below are hanging up on mingw. Investigating.
#if !defined(__MINGW32__)
TEST(Parallel, sort) {
std::mt19937 randEngine;
std::uniform_int_distribution<uint32_t> dist;
for (auto &i : array)
i = dist(randEngine);
sort(parallel::par, std::begin(array), std::end(array));
ASSERT_TRUE(std::is_sorted(std::begin(array), std::end(array)));
}
TEST(Parallel, parallel_for) {
// We need to test the case with a TaskSize > 1. We are white-box testing
// here. The TaskSize is calculated as (End - Begin) / 1024 at the time of
// writing.
uint32_t range[2050];
std::fill(range, range + 2050, 1);
for_each_n(parallel::par, 0, 2049, [&range](size_t I) { ++range[I]; });
uint32_t expected[2049];
std::fill(expected, expected + 2049, 2);
ASSERT_TRUE(std::equal(range, range + 2049, expected));
// Check that we don't write past the end of the requested range.
ASSERT_EQ(range[2049], 1u);
}
#endif
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