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// -*- C++ -*-
//===-- reduce.pass.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
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++03, c++11, c++14
#include "support/pstl_test_config.h"
#include <execution>
#include <numeric>
#include "support/utils.h"
using namespace TestUtils;
struct test_long_forms_for_one_policy
{
template <typename Policy, typename Iterator, typename T, typename BinaryOp>
void
operator()(Policy&& exec, Iterator first, Iterator last, T init, BinaryOp binary, T expected)
{
T result_r = std::reduce(exec, first, last, init, binary);
EXPECT_EQ(expected, result_r, "bad result from reduce(exec, first, last, init, binary_op)");
}
};
template <typename T, typename BinaryOp, typename F>
void
test_long_form(T init, BinaryOp binary_op, F f)
{
// Try sequences of various lengths
for (size_t n = 0; n <= 100000; n = n <= 16 ? n + 1 : size_t(3.1415 * n))
{
T expected(init);
Sequence<T> in(n, [n, f](size_t k) { return f((int32_t(k ^ n) % 1000 - 500)); });
for (size_t k = 0; k < n; ++k)
expected = binary_op(expected, in[k]);
using namespace std;
T result = transform_reduce_serial(in.cfbegin(), in.cfend(), init, binary_op, [](const T& t) { return t; });
EXPECT_EQ(expected, result, "bad result from reduce(first, last, init, binary_op_op)");
invoke_on_all_policies(test_long_forms_for_one_policy(), in.begin(), in.end(), init, binary_op, expected);
invoke_on_all_policies(test_long_forms_for_one_policy(), in.cbegin(), in.cend(), init, binary_op, expected);
}
}
struct test_two_short_forms
{
#if defined(_PSTL_ICC_16_VC14_TEST_PAR_TBB_RT_RELEASE_64_BROKEN) //dummy specialization by policy type, in case of broken configuration
template <typename Iterator>
void
operator()(pstl::execution::parallel_policy, Iterator first, Iterator last, Sum init, Sum expected)
{
}
template <typename Iterator>
void
operator()(pstl::execution::parallel_unsequenced_policy, Iterator first, Iterator last, Sum init, Sum expected)
{
}
#endif
template <typename Policy, typename Iterator>
void
operator()(Policy&& exec, Iterator first, Iterator last, Sum init, Sum expected)
{
using namespace std;
Sum r0 = init + reduce(exec, first, last);
EXPECT_EQ(expected, r0, "bad result from reduce(exec, first, last)");
Sum r1 = reduce(exec, first, last, init);
EXPECT_EQ(expected, r1, "bad result from reduce(exec, first, last, init)");
}
};
// Test forms of reduce(...) that omit the binary_op or init operands.
void
test_short_forms()
{
for (size_t n = 0; n <= 100000; n = n <= 16 ? n + 1 : size_t(3.1415 * n))
{
Sum init(42, OddTag());
Sum expected(init);
Sequence<Sum> in(n, [n](size_t k) { return Sum((int32_t(k ^ n) % 1000 - 500), OddTag()); });
for (size_t k = 0; k < n; ++k)
expected = expected + in[k];
invoke_on_all_policies(test_two_short_forms(), in.begin(), in.end(), init, expected);
invoke_on_all_policies(test_two_short_forms(), in.cbegin(), in.cend(), init, expected);
}
}
int
main()
{
// Test for popular types
test_long_form(42, std::plus<int32_t>(), [](int32_t x) { return x; });
test_long_form(42.0, std::plus<float64_t>(), [](float64_t x) { return x; });
// Test for strict types
test_long_form<Number>(Number(42, OddTag()), Add(OddTag()), [](int32_t x) { return Number(x, OddTag()); });
// Short forms are just facade for long forms, so just test with a single type.
test_short_forms();
std::cout << done() << std::endl;
return 0;
}
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