mirror of
https://github.com/matrix-construct/construct
synced 2024-11-25 08:12:37 +01:00
ircd::simd: Split bit manipulations suites to headers; renames.
This commit is contained in:
Jason Volk
parent
291038a014
commit
3a70943b94
5 changed files with 208 additions and 140 deletions
66
include/ircd/simd/lzcnt.h
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66
include/ircd/simd/lzcnt.h
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@ -0,0 +1,66 @@
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// 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_LZCNT_H
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namespace ircd::simd
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{
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template<class T> uint lzcnt(const T) noexcept;
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}
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/// Convenience template. Unfortunately this drops to scalar until specific
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/// targets and specializations are created.
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template<class T>
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inline uint
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__attribute__((target("lzcnt")))
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ircd::simd::lzcnt(const T a)
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noexcept
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{
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// The behavior of lzcnt can differ among platforms; when true we expect
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// lzcnt to fall back to bsr-like behavior.
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constexpr auto bitscan
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{
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#ifdef __LZCNT__
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false
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#else
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true
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#endif
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};
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uint ret(0), i(0); do
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{
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const auto mask
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{
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boolmask(uint(ret == sizeof_lane<T>() * 8 * i))
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};
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if constexpr(bitscan && sizeof_lane<T>() <= sizeof(u16))
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ret += (15 - __lzcnt16(__builtin_bswap16(a[i++]))) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u16))
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ret += __lzcnt16(__builtin_bswap16(a[i++])) & mask;
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else if constexpr(bitscan && sizeof_lane<T>() <= sizeof(u32))
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ret += (31 - __lzcnt32(__builtin_bswap32(a[i++]))) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u32))
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ret += __lzcnt32(__builtin_bswap32(a[i++])) & mask;
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else if constexpr(bitscan)
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ret += (63 - __lzcnt64(__builtin_bswap64(a[i++]))) & mask;
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else
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ret += __lzcnt64(__builtin_bswap64(a[i++])) & mask;
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}
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while(i < lanes<T>());
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return ret;
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}
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59
include/ircd/simd/popcnt.h
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59
include/ircd/simd/popcnt.h
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@ -0,0 +1,59 @@
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// 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_POPCNT_H
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namespace ircd::simd
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{
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template<class T> T popmask(const T) noexcept;
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template<class T> T boolmask(const T) noexcept;
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template<class T> uint popcnt(const T) noexcept;
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}
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/// Convenience template. Unfortunately this drops to scalar until specific
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/// targets and specializations are created.
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template<class T>
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inline uint
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ircd::simd::popcnt(const T a)
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noexcept
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{
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uint ret(0), i(0);
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for(; i < lanes<T>(); ++i)
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if constexpr(sizeof_lane<T>() <= sizeof(int))
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ret += __builtin_popcount(a[i]);
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else if constexpr(sizeof_lane<T>() <= sizeof(long))
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ret += __builtin_popcountl(a[i]);
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else
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ret += __builtin_popcountll(a[i]);
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return ret;
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}
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/// Convenience template. Extends a bool value where the lsb is 1 or 0 into a
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/// mask value like the result of vector comparisons.
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template<class T>
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inline T
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ircd::simd::boolmask(const T a)
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noexcept
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{
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return ~(popmask(a) - 1);
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}
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/// Convenience template. Vector compare instructions yield 0xff on equal;
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/// sometimes one might need an actual value of 1 for accumulators or maybe
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/// some bool-type reason...
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template<class T>
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inline T
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ircd::simd::popmask(const T a)
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noexcept
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{
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return a & 1;
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}
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@ -16,144 +16,22 @@
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#include "lane_cast.h"
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#include "broad_cast.h"
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#include "shift.h"
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#include "popcnt.h"
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#include "lzcnt.h"
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#include "tzcnt.h"
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#include "print.h"
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namespace ircd::simd
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{
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template<class T> T popmask(const T) noexcept;
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template<class T> T boolmask(const T) noexcept;
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template<class T> uint popcount(const T) noexcept;
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template<class T> uint clz(const T) noexcept;
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template<class T> uint ctz(const T) noexcept;
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}
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namespace ircd
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{
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using simd::lane_cast;
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using simd::shl;
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using simd::shr;
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}
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/// Convenience template. Unfortunately this drops to scalar until specific
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/// targets and specializations are created.
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template<class T>
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inline uint
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__attribute__((target("lzcnt")))
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ircd::simd::clz(const T a)
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noexcept
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{
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constexpr auto uses_bsr
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{
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#ifndef __LZCNT__
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true
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#else
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false
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#endif
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};
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uint ret(0), i(0); do
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{
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const auto mask
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{
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boolmask(uint(ret == sizeof_lane<T>() * 8 * i))
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};
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if constexpr(sizeof_lane<T>() <= sizeof(u16) && uses_bsr)
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ret += (15 - __lzcnt16(__builtin_bswap16(a[i++]))) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u16))
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ret += __lzcnt16(__builtin_bswap16(a[i++])) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u32) && uses_bsr)
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ret += (31 - __lzcnt32(__builtin_bswap32(a[i++]))) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u32))
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ret += __lzcnt32(__builtin_bswap32(a[i++])) & mask;
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else if constexpr(uses_bsr)
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ret += (63 - __lzcnt64(__builtin_bswap64(a[i++]))) & mask;
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else
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ret += __lzcnt64(__builtin_bswap64(a[i++])) & mask;
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}
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while(i < lanes<T>());
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return ret;
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}
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/// Convenience template. Unfortunately this drops to scalar until specific
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/// targets and specializations are created.
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template<class T>
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inline uint
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__attribute__((target("lzcnt")))
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ircd::simd::ctz(const T a)
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noexcept
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{
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constexpr auto uses_bsr
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{
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#ifndef __LZCNT__
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true
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#else
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false
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#endif
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};
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uint ret(0), i(lanes<T>()), mask(-1U); do
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{
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if constexpr(sizeof_lane<T>() <= sizeof(u16) && uses_bsr)
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ret += (15 - __lzcnt16(a[--i])) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u16))
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ret += __lzcnt16(a[--i]) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u32) && uses_bsr)
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ret += (31 - __lzcnt32(a[--i])) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u32))
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ret += __lzcnt32(a[--i]) & mask;
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else if constexpr(uses_bsr)
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ret += (63 - __lzcnt64(a[--i])) & mask;
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else
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ret += __lzcnt64(a[--i]) & mask;
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static const auto lane_bits(sizeof_lane<T>() * 8);
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mask &= boolmask(uint(ret % lane_bits == 0));
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mask &= boolmask(uint(ret != 0));
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}
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while(i);
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return ret;
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}
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/// Convenience template. Unfortunately this drops to scalar until specific
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/// targets and specializations are created.
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template<class T>
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inline uint
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ircd::simd::popcount(const T a)
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noexcept
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{
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uint ret(0), i(0);
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for(; i < lanes<T>(); ++i)
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if constexpr(sizeof_lane<T>() <= sizeof(int))
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ret += __builtin_popcount(a[i]);
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else if constexpr(sizeof_lane<T>() <= sizeof(long))
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ret += __builtin_popcountl(a[i]);
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else
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ret += __builtin_popcountll(a[i]);
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return ret;
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}
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/// Convenience template. Extends a bool value where the lsb is 1 or 0 into a
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/// mask value like the result of vector comparisons.
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template<class T>
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inline T
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ircd::simd::boolmask(const T a)
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noexcept
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{
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return ~(popmask(a) - 1);
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}
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/// Convenience template. Vector compare instructions yield 0xff on equal;
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/// sometimes one might need an actual value of 1 for accumulators or maybe
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/// some bool-type reason...
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template<class T>
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inline T
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ircd::simd::popmask(const T a)
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noexcept
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{
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return a & 1;
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using simd::lzcnt;
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using simd::tzcnt;
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using simd::popcnt;
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using simd::popmask;
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using simd::boolmask;
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}
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65
include/ircd/simd/tzcnt.h
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65
include/ircd/simd/tzcnt.h
Normal file
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@ -0,0 +1,65 @@
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// 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_TZCNT_H
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namespace ircd::simd
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{
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template<class T> uint tzcnt(const T) noexcept;
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}
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/// Convenience template. Unfortunately this drops to scalar until specific
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/// targets and specializations are created.
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template<class T>
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inline uint
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__attribute__((target("lzcnt")))
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ircd::simd::tzcnt(const T a)
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noexcept
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{
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// The behavior of lzcnt/tzcnt can differ among platforms; when false we
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// lzcnt/tzcnt to fall back to bsr/bsf-like behavior.
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constexpr auto bitscan
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{
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#ifdef __LZCNT__
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false
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#else
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true
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#endif
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};
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uint ret(0), i(lanes<T>()), mask(-1U); do
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{
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if constexpr(bitscan && sizeof_lane<T>() <= sizeof(u16))
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ret += (15 - __lzcnt16(a[--i])) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u16))
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ret += __lzcnt16(a[--i]) & mask;
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else if constexpr(bitscan && sizeof_lane<T>() <= sizeof(u32))
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ret += (31 - __lzcnt32(a[--i])) & mask;
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else if constexpr(sizeof_lane<T>() <= sizeof(u32))
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ret += __lzcnt32(a[--i]) & mask;
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else if constexpr(bitscan)
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ret += (63 - __lzcnt64(a[--i])) & mask;
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else
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ret += __lzcnt64(a[--i]) & mask;
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static const auto lane_bits(sizeof_lane<T>() * 8);
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mask &= boolmask(uint(ret % lane_bits == 0));
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mask &= boolmask(uint(ret != 0));
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}
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while(i);
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return ret;
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}
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14
ircd/json.cc
14
ircd/json.cc
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@ -3405,7 +3405,7 @@ ircd::json::string_stringify(u8x16 &__restrict__ block,
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// counting past the end of the string.
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const u64 regular_prefix_count
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{
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simd::clz(u64x2(is_special | ~block_mask)) / 8
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simd::lzcnt(u64x2(is_special | ~block_mask)) / 8
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};
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// Fast-path; backward branch to count and consume uninteresting characters
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@ -3460,7 +3460,7 @@ ircd::json::string_stringify(u8x16 &__restrict__ block,
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const u64 match_depth
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{
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simd::clz(u64x2(match)) / 8
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simd::lzcnt(u64x2(match)) / 8
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};
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// Legitimately escaped single char
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@ -3568,7 +3568,7 @@ ircd::json::string_stringify_utf16(u8x16 &__restrict__ block,
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const auto surrogates
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{
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simd::popcount(u64x2(simd::popmask(u8x16(is_surrogate))))
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simd::popcnt(u64x2(simd::popmask(u8x16(is_surrogate))))
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};
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assert(di == length[0] + length[1]);
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@ -3647,7 +3647,7 @@ ircd::json::string_serialized(const u8x16 block,
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const u64 regular_prefix_count
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{
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simd::clz(u64x2(is_special | ~block_mask)) / 8
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simd::lzcnt(u64x2(is_special | ~block_mask)) / 8
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};
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// Fast-path; backward branch to count and consume uninteresting characters
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@ -3691,7 +3691,7 @@ ircd::json::string_serialized(const u8x16 block,
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const u64 match_depth
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{
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simd::clz(u64x2(match)) / 8
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simd::lzcnt(u64x2(match)) / 8
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};
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// Legitimately escaped single char
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@ -3779,7 +3779,7 @@ ircd::json::string_serialized_utf16(const u8x16 block,
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const auto surrogates
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{
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simd::popcount(u64x2(simd::popmask(u8x16(is_surrogate))))
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simd::popcnt(u64x2(simd::popmask(u8x16(is_surrogate))))
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};
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return u64x2
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@ -3801,7 +3801,7 @@ ircd::json::string_serialized_ctrl(const u8x16 block,
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const u64 ctrl_prefix_count
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{
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simd::clz(u64x2(~is_ctrl | ~block_mask)) / 8
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simd::lzcnt(u64x2(~is_ctrl | ~block_mask)) / 8
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};
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u64 ret(0);
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