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// Copyright (C) 2020-2022 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this library; see the file COPYING3. If not see
// <http://www.gnu.org/licenses/>.
#ifndef VC_TESTS_SIMD_VIEW_H_
#define VC_TESTS_SIMD_VIEW_H_
#include <experimental/simd>
_GLIBCXX_SIMD_BEGIN_NAMESPACE
namespace experimental
{
namespace imported_begin_end
{
using std::begin;
using std::end;
template <class T>
using begin_type = decltype(begin(std::declval<T>()));
template <class T>
using end_type = decltype(end(std::declval<T>()));
} // namespace imported_begin_end
template <class V, class It, class End>
class viewer
{
It it;
const End end;
template <class F>
void
for_each_impl(F &&fun, std::index_sequence<0, 1, 2>)
{
for (; it + V::size() <= end; it += V::size())
{
fun(V([&](auto i) { return std::get<0>(it[i].as_tuple()); }),
V([&](auto i) { return std::get<1>(it[i].as_tuple()); }),
V([&](auto i) { return std::get<2>(it[i].as_tuple()); }));
}
if (it != end)
{
fun(V([&](auto i)
{
auto ii = it + i < end ? i + 0 : 0;
return std::get<0>(it[ii].as_tuple());
}),
V([&](auto i) {
auto ii = it + i < end ? i + 0 : 0;
return std::get<1>(it[ii].as_tuple());
}),
V([&](auto i) {
auto ii = it + i < end ? i + 0 : 0;
return std::get<2>(it[ii].as_tuple());
}));
}
}
template <class F>
void
for_each_impl(F &&fun, std::index_sequence<0, 1>)
{
for (; it + V::size() <= end; it += V::size())
{
fun(V([&](auto i) { return std::get<0>(it[i].as_tuple()); }),
V([&](auto i) { return std::get<1>(it[i].as_tuple()); }));
}
if (it != end)
{
fun(V([&](auto i) {
auto ii = it + i < end ? i + 0 : 0;
return std::get<0>(it[ii].as_tuple());
}),
V([&](auto i) {
auto ii = it + i < end ? i + 0 : 0;
return std::get<1>(it[ii].as_tuple());
}));
}
}
public:
viewer(It _it, End _end)
: it(_it), end(_end) {}
template <class F>
void
for_each(F &&fun)
{
constexpr size_t N
= std::tuple_size<std::decay_t<decltype(it->as_tuple())>>::value;
for_each_impl(std::forward<F>(fun), std::make_index_sequence<N>());
}
};
template <class V, class Cont>
viewer<V, imported_begin_end::begin_type<const Cont &>,
imported_begin_end::end_type<const Cont &>>
simd_view(const Cont &data)
{
using std::begin;
using std::end;
return {begin(data), end(data)};
}
} // namespace experimental
_GLIBCXX_SIMD_END_NAMESPACE
#endif // VC_TESTS_SIMD_VIEW_H_
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