mirror of
https://github.com/matrix-construct/construct
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56 lines
1.3 KiB
C++
56 lines
1.3 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_SHUF_H
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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
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shuf(const T in,
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const U dst = lane_id<U>(),
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const U src = lane_id<U>()) noexcept;
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}
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/// Move values between lanes in a vector. The destination lane number and
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/// source lane number are indexed by respective argument. Each argument is
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/// a vector with the same number of lanes as the input value vector. By
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/// default each argument vector is lane_id(), which means no-op.
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///
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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::shuf(const T in,
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const U dst,
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const U src)
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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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lane_type<T> out alignas(alignof(T)) [lanes<T>()]
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{
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0
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};
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for(uint i(0); i < lanes<T>(); ++i)
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out[dst[i]] = in[src[i]];
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return *reinterpret_cast<const T *>(out);
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}
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