mirror of
https://github.com/matrix-construct/construct
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105 lines
2.1 KiB
C++
105 lines
2.1 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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_ROR_H
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// xmmx rotate-right interface
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namespace ircd::simd
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{
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template<int b,
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class V,
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class T>
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T _ror(const T) noexcept;
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template<int b,
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class T>
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typename std::enable_if<sizeof(T) == 16, T>::type
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ror(const T a) noexcept;
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template<int b,
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class T>
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typename std::enable_if<sizeof(T) == 32, T>::type
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ror(const T a) noexcept;
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template<int b,
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class T>
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typename std::enable_if<sizeof(T) == 64, T>::type
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ror(const T a) noexcept;
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}
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template<int b,
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class V,
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class T>
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[[using gnu: always_inline, gnu_inline, artificial]]
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extern inline T
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ircd::simd::_ror(const T a)
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noexcept
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{
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static_assert
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(
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sizeof(T) == sizeof(V)
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);
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static_assert
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(
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b % 8 == 0, "[emulated] xmmx register only rotates left at bytewise resolution."
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);
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constexpr int B
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{
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b / 8
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};
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constexpr auto S
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{
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sizeof(V) - B
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};
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size_t i(0);
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V arg(a), ret;
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for(; i < S; ++i)
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ret[i] = arg[i + B];
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for(; i < sizeof(V); ++i)
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ret[i] = arg[i - S];
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return T(ret);
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}
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template<int b,
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class T>
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[[using gnu: always_inline, gnu_inline, artificial]]
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extern inline typename std::enable_if<sizeof(T) == 16, T>::type
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ircd::simd::ror(const T a)
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noexcept
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{
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return _ror<b, u8x16>(a);
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}
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template<int b,
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class T>
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[[using gnu: always_inline, gnu_inline, artificial]]
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extern inline typename std::enable_if<sizeof(T) == 32, T>::type
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ircd::simd::ror(const T a)
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noexcept
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{
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return _ror<b, u8x32>(a);
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}
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template<int b,
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class T>
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[[using gnu: always_inline, gnu_inline, artificial]]
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extern inline typename std::enable_if<sizeof(T) == 64, T>::type
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ircd::simd::ror(const T a)
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noexcept
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{
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return _ror<b, u8x64>(a);
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}
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