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construct/include/ircd/simd/upper.h

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// The Construct
//
// Copyright (C) The Construct Developers, Authors & Contributors
// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice is present in all copies. The
// full license for this software is available in the LICENSE file.
#pragma once
#define HAVE_IRCD_SIMD_UPPER_H
namespace ircd::simd
{
template<class R,
class T>
R upper(const T) noexcept;
}
template<class R,
class T>
inline R
ircd::simd::upper(const T a)
noexcept
{
static_assert
(
sizeof(R) * 2 == sizeof(T),
"Types must have equal size."
);
static_assert
(
lanes<R>() * 2 == lanes<T>(),
"T must have twice as many lanes as R"
);
R ret;
for(size_t i(0); i < lanes<R>(); ++i)
ret[i] = a[lanes<R>() + i];
return ret;
}