mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 02:32:43 +01:00
36 lines
1 KiB
C++
36 lines
1 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_POPCNT_H
|
|
|
|
namespace ircd::simd
|
|
{
|
|
template<class T> uint popcnt(const T) noexcept;
|
|
}
|
|
|
|
/// Convenience template. Unfortunately this drops to scalar until specific
|
|
/// targets and specializations are created.
|
|
template<class T>
|
|
inline uint
|
|
ircd::simd::popcnt(const T a)
|
|
noexcept
|
|
{
|
|
uint ret(0), i(0);
|
|
for(; i < lanes<T>(); ++i)
|
|
if constexpr(sizeof_lane<T>() <= sizeof(int))
|
|
ret += __builtin_popcount(a[i]);
|
|
else if constexpr(sizeof_lane<T>() <= sizeof(long))
|
|
ret += __builtin_popcountl(a[i]);
|
|
else
|
|
ret += __builtin_popcountll(a[i]);
|
|
|
|
return ret;
|
|
}
|