mirror of
https://github.com/matrix-construct/construct
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49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2021 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_SIMD_PACK_H
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// Pack values left overwriting unmasked lanes.
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namespace ircd::simd
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{
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template<class T,
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class U>
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T pack(const T vals, const U mask) noexcept;
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}
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/// Left-pack values to eliminate unmasked lanes.
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/// TODO: WIP
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template<class T,
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class U>
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inline T
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ircd::simd::pack(const T val,
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const U mask)
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noexcept
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{
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static_assert
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(
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lanes<T>() == lanes<U>()
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);
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static_assert
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(
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std::is_integral<lane_type<U>>()
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);
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U idx{0}, add(mask & 1);
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for(uint i(0); i < lanes<U>(); ++i)
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{
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add = shl<sizeof_lane<U>() * 8L>(add);
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idx += add;
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}
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return shuf(val, idx);
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}
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