mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 02:32:43 +01:00
133 lines
2.9 KiB
C++
133 lines
2.9 KiB
C++
// 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_SHR_H
|
|
|
|
// xmmx shift-right interface
|
|
namespace ircd::simd
|
|
{
|
|
template<int b,
|
|
class V,
|
|
class T>
|
|
T _shr(const T) noexcept;
|
|
|
|
template<int b,
|
|
class T>
|
|
typename std::enable_if<sizeof(T) == 16, T>::type
|
|
shr(const T a) noexcept;
|
|
|
|
template<int b,
|
|
class T>
|
|
typename std::enable_if<sizeof(T) == 32, T>::type
|
|
shr(const T a) noexcept;
|
|
|
|
template<int b,
|
|
class T>
|
|
typename std::enable_if<sizeof(T) == 64, T>::type
|
|
shr(const T a) noexcept;
|
|
}
|
|
|
|
template<int b,
|
|
class V,
|
|
class T>
|
|
[[using gnu: always_inline, gnu_inline, artificial]]
|
|
extern inline T
|
|
ircd::simd::_shr(const T a)
|
|
noexcept
|
|
{
|
|
static_assert
|
|
(
|
|
sizeof(T) == sizeof(V)
|
|
);
|
|
|
|
static_assert
|
|
(
|
|
b % 8 == 0, "[emulated] xmmx register only shifts right at bytewise resolution."
|
|
);
|
|
|
|
constexpr int B
|
|
{
|
|
b / 8
|
|
};
|
|
|
|
V arg(a), ret;
|
|
for(size_t i(0); i < sizeof(V) - B; ++i)
|
|
ret[i] = arg[i + B];
|
|
|
|
for(size_t i(sizeof(V) - B); i < sizeof(V); ++i)
|
|
ret[i] = 0;
|
|
|
|
return T(ret);
|
|
}
|
|
|
|
#if defined(HAVE_X86INTRIN_H) && defined(__SSE2__)
|
|
template<int b,
|
|
class T>
|
|
[[using gnu: always_inline, gnu_inline, artificial]]
|
|
extern inline typename std::enable_if<sizeof(T) == 16, T>::type
|
|
ircd::simd::shr(const T a)
|
|
noexcept
|
|
{
|
|
static_assert
|
|
(
|
|
b % 8 == 0, "xmmx register only shifts right at bytewise resolution."
|
|
);
|
|
|
|
return T(_mm_bsrli_si128(u128x1(a), b / 8));
|
|
}
|
|
#else
|
|
template<int b,
|
|
class T>
|
|
[[using gnu: always_inline, gnu_inline, artificial]]
|
|
extern inline typename std::enable_if<sizeof(T) == 16, T>::type
|
|
ircd::simd::shr(const T a)
|
|
noexcept
|
|
{
|
|
return _shr<b, u8x16>(a);
|
|
}
|
|
#endif
|
|
|
|
#if defined(HAVE_X86INTRIN_H) && defined(__AVX2__)
|
|
template<int b,
|
|
class T>
|
|
[[using gnu: always_inline, gnu_inline, artificial]]
|
|
extern inline typename std::enable_if<sizeof(T) == 32, T>::type
|
|
ircd::simd::shr(const T a)
|
|
noexcept
|
|
{
|
|
static_assert
|
|
(
|
|
b % 8 == 0, "ymmx register only shifts right at bytewise resolution."
|
|
);
|
|
|
|
return T(_mm256_srli_si256(u256x1(a), b / 8));
|
|
}
|
|
#else
|
|
template<int b,
|
|
class T>
|
|
[[using gnu: always_inline, gnu_inline, artificial]]
|
|
extern inline typename std::enable_if<sizeof(T) == 32, T>::type
|
|
ircd::simd::shr(const T a)
|
|
noexcept
|
|
{
|
|
return _shr<b, u8x32>(a);
|
|
}
|
|
#endif
|
|
|
|
template<int b,
|
|
class T>
|
|
[[using gnu: always_inline, gnu_inline, artificial]]
|
|
extern inline typename std::enable_if<sizeof(T) == 64, T>::type
|
|
ircd::simd::shr(const T a)
|
|
noexcept
|
|
{
|
|
return _shr<b, u8x64>(a);
|
|
}
|