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TestMDSpanConversion.hpp
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TestMDSpanConversion.hpp
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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 <gtest/gtest.h>
#include <type_traits>
#include <Kokkos_Core.hpp>
#ifdef KOKKOS_ENABLE_IMPL_MDSPAN
namespace Test {
template <class T, class ExecutionSpace>
struct TestViewMDSpanConversion {
using value_type = T;
template <std::size_t Padding>
using layout_left_padded = Kokkos::Experimental::layout_left_padded<Padding>;
template <std::size_t Padding>
using layout_right_padded =
Kokkos::Experimental::layout_right_padded<Padding>;
struct TestAccessor {
using offset_policy = TestAccessor;
using element_type = value_type;
using reference = element_type &;
using data_handle_type = element_type *;
constexpr TestAccessor() noexcept = default;
constexpr reference access(data_handle_type p, std::size_t i) noexcept {
return p[i];
}
constexpr data_handle_type offset(data_handle_type p, std::size_t i) noexcept {
return p + i;
}
};
template <class KokkosLayout, class DataType, class MDSpanLayoutMapping,
class... RefViewProps>
static void test_conversion_from_mdspan(
Kokkos::View<DataType, RefViewProps...> ref,
const MDSpanLayoutMapping &mapping) {
using unmanaged_view_view_type = Kokkos::View<DataType, KokkosLayout, ExecutionSpace,
Kokkos::MemoryTraits<Kokkos::Unmanaged>>;
using natural_mdspan_type = typename Kokkos::Impl::MDSpanViewTraits<
typename unmanaged_view_view_type::traits>::mdspan_type;
using mapping_type = MDSpanLayoutMapping;
using mdspan_layout_type = typename MDSpanLayoutMapping::layout_type;
using extents_type = typename mapping_type::extents_type;
using mdspan_type =
Kokkos::mdspan<value_type, extents_type, mdspan_layout_type>;
static_assert(std::is_constructible_v<natural_mdspan_type, mdspan_type>);
static_assert(std::is_convertible_v<mdspan_type, natural_mdspan_type> ==
std::is_convertible_v<mdspan_type, unmanaged_view_view_type>);
// Manually create an mdspan from ref so we have a valid pointer to play
// with
const auto &exts = mapping.extents();
auto mds = mdspan_type{ref.data(), mapping};
auto test_view = unmanaged_view_view_type(mds);
ASSERT_EQ(test_view.data(), ref.data());
ASSERT_EQ(test_view.data(), mds.data_handle());
ASSERT_EQ(test_view.layout(), ref.layout());
for (std::size_t r = 0; r < mdspan_type::rank(); ++r) {
ASSERT_EQ(test_view.extent(r), ref.extent(r));
ASSERT_EQ(test_view.extent(r), exts.extent(r));
}
}
template <class MDSpanLayoutMapping, class ViewType>
static void test_conversion_to_mdspan(
const MDSpanLayoutMapping &ref_layout_mapping, ViewType v) {
using view_type = ViewType;
using natural_mdspan_type = typename Kokkos::Impl::MDSpanViewTraits<
typename view_type::traits>::mdspan_type;
static_assert(natural_mdspan_type::rank() == view_type::rank);
static_assert(std::is_same_v<typename natural_mdspan_type::value_type, typename view_type::value_type>);
// test conversion operator to natural mdspan
{
natural_mdspan_type cvt = v;
ASSERT_EQ(cvt.data_handle(), v.data());
ASSERT_EQ(cvt.mapping(), ref_layout_mapping);
}
// test to_mdspan() returning natural mdspan
{
auto cvt = v.to_mdspan();
static_assert(std::is_same_v<natural_mdspan_type, decltype(cvt)>);
ASSERT_EQ(cvt.data_handle(), v.data());
ASSERT_EQ(cvt.mapping(), ref_layout_mapping);
}
// test conversion operator to different mdspan type
{
using mdspan_type = Kokkos::mdspan<
const typename natural_mdspan_type::element_type,
Kokkos::dextents<typename natural_mdspan_type::index_type,
natural_mdspan_type::rank()>,
typename natural_mdspan_type::layout_type,
typename natural_mdspan_type::accessor_type>;
mdspan_type cvt = v;
ASSERT_EQ(cvt.data_handle(), v.data());
ASSERT_EQ(cvt.mapping(), ref_layout_mapping);
}
}
template <class MDSpanLayoutMapping, class ViewType, class AccessorType>
static void test_conversion_to_mdspan_with_accessor(
const MDSpanLayoutMapping &ref_layout_mapping, ViewType v,
const AccessorType &a) {
auto cvt = v.to_mdspan(a);
static_assert(decltype(cvt)::rank() == ViewType::rank);
static_assert(std::is_same_v<typename decltype(cvt)::value_type,
typename ViewType::value_type>);
ASSERT_EQ(cvt.data_handle(), v.data());
ASSERT_EQ(cvt.mapping(), ref_layout_mapping);
}
static void run_test() {
// nvcc doesn't do CTAD properly here, making this way more verbose..
// LayoutLeft
test_conversion_from_mdspan<Kokkos::LayoutLeft>(
Kokkos::View<value_type *, Kokkos::LayoutLeft, ExecutionSpace>("ref",
7),
typename layout_left_padded<sizeof(
value_type)>::template mapping<Kokkos::dextents<std::size_t, 1>>{
Kokkos::dextents<std::size_t, 1>(7)});
test_conversion_from_mdspan<Kokkos::LayoutLeft>(
Kokkos::View<value_type[7], Kokkos::LayoutLeft, ExecutionSpace>("ref"),
typename layout_left_padded<sizeof(
value_type)>::template mapping<Kokkos::extents<std::size_t, 7>>{
Kokkos::extents<std::size_t, 7>()});
test_conversion_from_mdspan<Kokkos::LayoutLeft>(
Kokkos::View<value_type[7], Kokkos::LayoutLeft, ExecutionSpace>("ref"),
typename layout_left_padded<sizeof(
value_type)>::template mapping<Kokkos::dextents<std::size_t, 1>>{
Kokkos::dextents<std::size_t, 1>(7)});
test_conversion_from_mdspan<Kokkos::LayoutLeft>(
Kokkos::View<value_type *, Kokkos::LayoutLeft, ExecutionSpace>("ref",
7),
typename layout_left_padded<sizeof(
value_type)>::template mapping<Kokkos::extents<std::size_t, 7>>{
Kokkos::extents<std::size_t, 7>()});
test_conversion_from_mdspan<Kokkos::LayoutLeft>(
Kokkos::View<value_type **, Kokkos::LayoutLeft, ExecutionSpace>("ref",
7, 3),
typename layout_left_padded<sizeof(
value_type)>::template mapping<Kokkos::dextents<std::size_t, 2>>{
Kokkos::dextents<std::size_t, 2>(7, 3)});
test_conversion_from_mdspan<Kokkos::LayoutLeft>(
Kokkos::View<value_type[7][3], Kokkos::LayoutLeft, ExecutionSpace>(
"ref"),
typename layout_left_padded<sizeof(
value_type)>::template mapping<Kokkos::extents<std::size_t, 7, 3>>{
Kokkos::extents<std::size_t, 7, 3>()});
test_conversion_from_mdspan<Kokkos::LayoutLeft>(
Kokkos::View<value_type[7][3], Kokkos::LayoutLeft, ExecutionSpace>(
"ref"),
typename layout_left_padded<sizeof(
value_type)>::template mapping<Kokkos::dextents<std::size_t, 2>>{
Kokkos::dextents<std::size_t, 2>(7, 3)});
test_conversion_from_mdspan<Kokkos::LayoutLeft>(
Kokkos::View<value_type **, Kokkos::LayoutLeft, ExecutionSpace>("ref",
7, 3),
typename layout_left_padded<sizeof(
value_type)>::template mapping<Kokkos::extents<std::size_t, 7, 3>>{
Kokkos::extents<std::size_t, 7, 3>()});
// LayoutRight
test_conversion_from_mdspan<Kokkos::LayoutRight>(
Kokkos::View<value_type *, Kokkos::LayoutRight, ExecutionSpace>("ref",
7),
typename layout_right_padded<sizeof(
value_type)>::template mapping<Kokkos::dextents<std::size_t, 1>>{
Kokkos::dextents<std::size_t, 1>(7)});
test_conversion_from_mdspan<Kokkos::LayoutRight>(
Kokkos::View<value_type[7], Kokkos::LayoutRight, ExecutionSpace>("ref"),
typename layout_right_padded<sizeof(
value_type)>::template mapping<Kokkos::extents<std::size_t, 7>>{
Kokkos::extents<std::size_t, 7>()});
test_conversion_from_mdspan<Kokkos::LayoutRight>(
Kokkos::View<value_type[7], Kokkos::LayoutRight, ExecutionSpace>("ref"),
typename layout_right_padded<sizeof(
value_type)>::template mapping<Kokkos::dextents<std::size_t, 1>>{
Kokkos::dextents<std::size_t, 1>(7)});
test_conversion_from_mdspan<Kokkos::LayoutRight>(
Kokkos::View<value_type *, Kokkos::LayoutRight, ExecutionSpace>("ref",
7),
typename layout_right_padded<sizeof(
value_type)>::template mapping<Kokkos::extents<std::size_t, 7>>{
Kokkos::extents<std::size_t, 7>()});
test_conversion_from_mdspan<Kokkos::LayoutRight>(
Kokkos::View<value_type **, Kokkos::LayoutRight, ExecutionSpace>("ref",
7, 3),
typename layout_right_padded<sizeof(
value_type)>::template mapping<Kokkos::dextents<std::size_t, 2>>{
Kokkos::dextents<std::size_t, 2>(7, 3)});
test_conversion_from_mdspan<Kokkos::LayoutRight>(
Kokkos::View<value_type[7][3], Kokkos::LayoutRight, ExecutionSpace>(
"ref"),
typename layout_right_padded<sizeof(
value_type)>::template mapping<Kokkos::extents<std::size_t, 7, 3>>{
Kokkos::extents<std::size_t, 7, 3>()});
test_conversion_from_mdspan<Kokkos::LayoutRight>(
Kokkos::View<value_type[7][3], Kokkos::LayoutRight, ExecutionSpace>(
"ref"),
typename layout_right_padded<sizeof(
value_type)>::template mapping<Kokkos::dextents<std::size_t, 2>>{
Kokkos::dextents<std::size_t, 2>(7, 3)});
test_conversion_from_mdspan<Kokkos::LayoutRight>(
Kokkos::View<value_type **, Kokkos::LayoutRight, ExecutionSpace>("ref",
7, 3),
typename layout_right_padded<sizeof(
value_type)>::template mapping<Kokkos::extents<std::size_t, 7, 3>>{
Kokkos::extents<std::size_t, 7, 3>()});
// LayoutStride
test_conversion_from_mdspan<Kokkos::LayoutStride>(
Kokkos::View<value_type *, Kokkos::LayoutStride, ExecutionSpace>(
"ref", Kokkos::LayoutStride{7, 2}),
Kokkos::layout_stride::mapping<Kokkos::dextents<std::size_t, 1>>{
Kokkos::dextents<std::size_t, 1>{7},
std::array<std::size_t, 1>{2}});
test_conversion_from_mdspan<Kokkos::LayoutStride>(
Kokkos::View<value_type[7], Kokkos::LayoutStride, ExecutionSpace>(
"ref", Kokkos::LayoutStride{7, 2}),
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 7>>{
{}, std::array<std::size_t, 1>{2}});
test_conversion_from_mdspan<Kokkos::LayoutStride>(
Kokkos::View<value_type[7], Kokkos::LayoutStride, ExecutionSpace>(
"ref", Kokkos::LayoutStride{7, 2}),
Kokkos::layout_stride::mapping<Kokkos::dextents<std::size_t, 1>>{
Kokkos::dextents<std::size_t, 1>{7},
std::array<std::size_t, 1>{2}});
test_conversion_from_mdspan<Kokkos::LayoutStride>(
Kokkos::View<value_type *, Kokkos::LayoutStride, ExecutionSpace>(
"ref", Kokkos::LayoutStride{7, 2}),
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 7>>{
Kokkos::extents<std::size_t, 7>(), std::array<std::size_t, 1>{2}});
test_conversion_from_mdspan<Kokkos::LayoutStride>(
Kokkos::View<value_type **, Kokkos::LayoutStride, ExecutionSpace>(
"ref", Kokkos::LayoutStride{7, 2, 3, 4}),
Kokkos::layout_stride::mapping<Kokkos::dextents<std::size_t, 2>>{
Kokkos::dextents<std::size_t, 2>(7, 3),
std::array<std::size_t, 2>{2, 4}});
test_conversion_from_mdspan<Kokkos::LayoutStride>(
Kokkos::View<value_type[7][3], Kokkos::LayoutStride, ExecutionSpace>(
"ref", Kokkos::LayoutStride{7, 2, 3, 4}),
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 7, 3>>{
Kokkos::extents<std::size_t, 7, 3>(),
std::array<std::size_t, 2>{2, 4}});
test_conversion_from_mdspan<Kokkos::LayoutStride>(
Kokkos::View<value_type[7][3], Kokkos::LayoutStride, ExecutionSpace>(
"ref", Kokkos::LayoutStride{7, 2, 3, 4}),
Kokkos::layout_stride::mapping<Kokkos::dextents<std::size_t, 2>>{
Kokkos::dextents<std::size_t, 2>(7, 3),
std::array<std::size_t, 2>{2, 4}});
test_conversion_from_mdspan<Kokkos::LayoutStride>(
Kokkos::View<value_type **, Kokkos::LayoutStride, ExecutionSpace>(
"ref", Kokkos::LayoutStride{7, 2, 3, 4}),
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 7, 3>>{
Kokkos::extents<std::size_t, 7, 3>(),
std::array<std::size_t, 2>{2, 4}});
// Conversion to mdspan
test_conversion_to_mdspan(
layout_left_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4>>({}, 4),
Kokkos::View<value_type *, Kokkos::LayoutLeft, ExecutionSpace>("v", 4));
test_conversion_to_mdspan(
layout_left_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4, 7>>({}, 4),
Kokkos::View<value_type **, Kokkos::LayoutLeft, ExecutionSpace>("v", 4,
7));
test_conversion_to_mdspan(
layout_right_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4>>({}, 4),
Kokkos::View<value_type *, Kokkos::LayoutRight, ExecutionSpace>("v",
4));
test_conversion_to_mdspan(
layout_right_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4, 7>>({}, 7),
Kokkos::View<value_type **, Kokkos::LayoutRight, ExecutionSpace>("v", 4,
7));
test_conversion_to_mdspan(
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 4>>(
{}, std::array<std::size_t, 1>{5}),
Kokkos::View<value_type *, Kokkos::LayoutStride, ExecutionSpace>(
"v", Kokkos::LayoutStride{4, 5}));
test_conversion_to_mdspan(
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 4, 7>>(
{}, std::array<std::size_t, 2>{5, 9}),
Kokkos::View<value_type **, Kokkos::LayoutStride, ExecutionSpace>(
"v", Kokkos::LayoutStride{4, 5, 7, 9}));
// Conversion with standard default_accessor
test_conversion_to_mdspan_with_accessor(
layout_left_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4>>({}, 4),
Kokkos::View<value_type *, Kokkos::LayoutLeft, ExecutionSpace>("v", 4),
Kokkos::default_accessor<value_type>{});
test_conversion_to_mdspan_with_accessor(
layout_left_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4, 7>>({}, 4),
Kokkos::View<value_type **, Kokkos::LayoutLeft, ExecutionSpace>("v", 4,
7),
Kokkos::default_accessor<value_type>{});
test_conversion_to_mdspan_with_accessor(
layout_right_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4>>({}, 4),
Kokkos::View<value_type *, Kokkos::LayoutRight, ExecutionSpace>("v", 4),
Kokkos::default_accessor<value_type>{});
test_conversion_to_mdspan_with_accessor(
layout_right_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4, 7>>({}, 7),
Kokkos::View<value_type **, Kokkos::LayoutRight, ExecutionSpace>("v", 4,
7),
Kokkos::default_accessor<value_type>{});
test_conversion_to_mdspan_with_accessor(
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 4>>(
{}, std::array<std::size_t, 1>{5}),
Kokkos::View<value_type *, Kokkos::LayoutStride, ExecutionSpace>(
"v", Kokkos::LayoutStride{4, 5}),
Kokkos::default_accessor<value_type>{});
test_conversion_to_mdspan_with_accessor(
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 4, 7>>(
{}, std::array<std::size_t, 2>{5, 9}),
Kokkos::View<value_type **, Kokkos::LayoutStride, ExecutionSpace>(
"v", Kokkos::LayoutStride{4, 5, 7, 9}),
Kokkos::default_accessor<value_type>{});
// Conversion with a test accessor
test_conversion_to_mdspan_with_accessor(
layout_left_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4>>({}, 4),
Kokkos::View<value_type *, Kokkos::LayoutLeft, ExecutionSpace>("v", 4),
TestAccessor{});
test_conversion_to_mdspan_with_accessor(
layout_left_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4, 7>>({}, 4),
Kokkos::View<value_type **, Kokkos::LayoutLeft, ExecutionSpace>("v", 4,
7),
TestAccessor{});
test_conversion_to_mdspan_with_accessor(
layout_right_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4>>({}, 4),
Kokkos::View<value_type *, Kokkos::LayoutRight, ExecutionSpace>("v", 4),
TestAccessor{});
test_conversion_to_mdspan_with_accessor(
layout_right_padded<Kokkos::dynamic_extent>::mapping<
Kokkos::extents<std::size_t, 4, 7>>({}, 7),
Kokkos::View<value_type **, Kokkos::LayoutRight, ExecutionSpace>("v", 4,
7),
TestAccessor{});
test_conversion_to_mdspan_with_accessor(
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 4>>(
{}, std::array<std::size_t, 1>{5}),
Kokkos::View<value_type *, Kokkos::LayoutStride, ExecutionSpace>(
"v", Kokkos::LayoutStride{4, 5}),
TestAccessor{});
test_conversion_to_mdspan_with_accessor(
Kokkos::layout_stride::mapping<Kokkos::extents<std::size_t, 4, 7>>(
{}, std::array<std::size_t, 2>{5, 9}),
Kokkos::View<value_type **, Kokkos::LayoutStride, ExecutionSpace>(
"v", Kokkos::LayoutStride{4, 5, 7, 9}),
TestAccessor{});
}
};
TEST(TEST_CATEGORY, view_mdspan_conversion) {
TestViewMDSpanConversion<double, TEST_EXECSPACE>::run_test();
TestViewMDSpanConversion<float, TEST_EXECSPACE>::run_test();
TestViewMDSpanConversion<int, TEST_EXECSPACE>::run_test();
}
}
#endif // KOKKOS_ENABLE_IMPL_MDSPAN