mirror of
https://github.com/matrix-construct/construct
synced 2024-12-29 00:44:17 +01:00
49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2021 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_PACK_H
|
|
|
|
// Pack values left overwriting unmasked lanes.
|
|
namespace ircd::simd
|
|
{
|
|
template<class T,
|
|
class U>
|
|
T pack(const T vals, const U mask) noexcept;
|
|
}
|
|
|
|
/// Left-pack values to eliminate unmasked lanes.
|
|
/// TODO: WIP
|
|
template<class T,
|
|
class U>
|
|
inline T
|
|
ircd::simd::pack(const T val,
|
|
const U mask)
|
|
noexcept
|
|
{
|
|
static_assert
|
|
(
|
|
lanes<T>() == lanes<U>()
|
|
);
|
|
|
|
static_assert
|
|
(
|
|
std::is_integral<lane_type<U>>()
|
|
);
|
|
|
|
U idx{0}, add(mask & 1);
|
|
for(uint i(0); i < lanes<U>(); ++i)
|
|
{
|
|
add = shl<sizeof_lane<U>() * 8L>(add);
|
|
idx += add;
|
|
}
|
|
|
|
return shuf(val, idx);
|
|
}
|