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lammps/lib/kokkos/core/unit_test/TestCXX11Deduction.hpp
2023-03-03 09:22:33 -07:00

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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#include <Kokkos_Core.hpp>
#ifndef TESTCXX11DEDUCTION_HPP
#define TESTCXX11DEDUCTION_HPP
namespace TestCXX11 {
struct TestReductionDeductionTagA {};
struct TestReductionDeductionTagB {};
template <class ExecSpace>
struct TestReductionDeductionFunctor {
// KOKKOS_INLINE_FUNCTION
// void operator()( long i, long & value ) const
// { value += i + 1; }
KOKKOS_INLINE_FUNCTION
void operator()(TestReductionDeductionTagA, long i, long &value) const {
value += (2 * i + 1) + (2 * i + 2);
}
KOKKOS_INLINE_FUNCTION
void operator()(const TestReductionDeductionTagB &, const long i,
long &value) const {
value += (3 * i + 1) + (3 * i + 2) + (3 * i + 3);
}
};
template <class ExecSpace>
void test_reduction_deduction() {
using Functor = TestReductionDeductionFunctor<ExecSpace>;
const long N = 50;
// const long answer = N % 2 ? ( N * ( ( N + 1 ) / 2 ) ) : ( ( N / 2 ) * ( N
// + 1 ) );
const long answerA =
N % 2 ? ((2 * N) * (((2 * N) + 1) / 2)) : (((2 * N) / 2) * ((2 * N) + 1));
const long answerB =
N % 2 ? ((3 * N) * (((3 * N) + 1) / 2)) : (((3 * N) / 2) * ((3 * N) + 1));
long result = 0;
// Kokkos::parallel_reduce( Kokkos::RangePolicy< ExecSpace >( 0, N ),
// Functor(), result ); ASSERT_EQ( answer, result );
Kokkos::parallel_reduce(
Kokkos::RangePolicy<ExecSpace, TestReductionDeductionTagA>(0, N),
Functor(), result);
ASSERT_EQ(answerA, result);
Kokkos::parallel_reduce(
Kokkos::RangePolicy<ExecSpace, TestReductionDeductionTagB>(0, N),
Functor(), result);
ASSERT_EQ(answerB, result);
}
} // namespace TestCXX11
namespace Test {
TEST(TEST_CATEGORY, reduction_deduction) {
TestCXX11::test_reduction_deduction<TEST_EXECSPACE>();
}
} // namespace Test
#endif