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https://github.com/gnif/LookingGlass.git
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123 lines
No EOL
3.6 KiB
C
123 lines
No EOL
3.6 KiB
C
/*
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KVMGFX Client - A KVM Client for VGA Passthrough
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Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; either version 2 of the License, or (at your option) any later
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version.
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This program is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
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PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#pragma once
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <tmmintrin.h>
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#include <immintrin.h>
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#include "debug.h"
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static inline void memcpySSE(void * dst, const void * src, size_t length)
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{
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// check if we can't perform an aligned copy
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if (((uintptr_t)src & 0xF) != ((uintptr_t)dst & 0xF))
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{
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static bool unalignedDstWarn = false;
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if (!unalignedDstWarn)
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{
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DEBUG_WARN("Memcpy64 unable to perform aligned copy, performance will suffer");
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unalignedDstWarn = true;
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}
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// fallback to system memcpy
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memcpy(dst, src, length);
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return;
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}
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// check if the source needs alignment
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{
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uint8_t * _src = (uint8_t *)src;
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unsigned int count = (16 - ((uintptr_t)src & 0xF)) & 0xF;
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static bool unalignedSrcWarn = false;
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if (count > 0)
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{
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if (!unalignedSrcWarn)
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{
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DEBUG_WARN("Memcpy64 unaligned source, performance will suffer");
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unalignedSrcWarn = true;
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}
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uint8_t * _dst = (uint8_t *)dst;
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for (unsigned int i = count; i > 0; --i)
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*_dst++ = *_src++;
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src = _src;
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dst = _dst;
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length -= count;
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}
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}
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__m128i * _src = (__m128i *)src;
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__m128i * _dst = (__m128i *)dst;
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__m128i v0, v1, v2, v3, v4, v5, v6, v7;
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const size_t sselen = length & ~0x7F;
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const __m128i * _end = (__m128i *)((uintptr_t)src + sselen);
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for (; _src != _end; _src += 8, _dst += 8)
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{
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_mm_prefetch(((char *)(_src + 8 )), _MM_HINT_NTA);
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_mm_prefetch(((char *)(_src + 9 )), _MM_HINT_NTA);
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_mm_prefetch(((char *)(_src + 10)), _MM_HINT_NTA);
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_mm_prefetch(((char *)(_src + 11)), _MM_HINT_NTA);
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v0 = _mm_load_si128(_src + 0);
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v1 = _mm_load_si128(_src + 1);
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v2 = _mm_load_si128(_src + 2);
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v3 = _mm_load_si128(_src + 3);
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v4 = _mm_load_si128(_src + 4);
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v5 = _mm_load_si128(_src + 5);
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v6 = _mm_load_si128(_src + 6);
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v7 = _mm_load_si128(_src + 7);
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_mm_stream_si128(_dst + 0, v0);
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_mm_stream_si128(_dst + 1, v1);
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_mm_stream_si128(_dst + 2, v2);
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_mm_stream_si128(_dst + 3, v3);
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_mm_stream_si128(_dst + 4, v4);
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_mm_stream_si128(_dst + 5, v5);
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_mm_stream_si128(_dst + 6, v6);
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_mm_stream_si128(_dst + 7, v7);
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}
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const size_t remain = ((length - sselen) & ~0xF) >> 4;
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switch (remain)
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{
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case 7: v0 = _mm_load_si128(_src++);
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case 6: v1 = _mm_load_si128(_src++);
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case 5: v2 = _mm_load_si128(_src++);
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case 4: v3 = _mm_load_si128(_src++);
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case 3: v4 = _mm_load_si128(_src++);
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case 2: v5 = _mm_load_si128(_src++);
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case 1: v6 = _mm_load_si128(_src++);
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}
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switch (remain)
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{
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case 7: _mm_stream_si128(_dst++, v0);
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case 6: _mm_stream_si128(_dst++, v1);
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case 5: _mm_stream_si128(_dst++, v2);
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case 4: _mm_stream_si128(_dst++, v3);
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case 3: _mm_stream_si128(_dst++, v4);
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case 2: _mm_stream_si128(_dst++, v5);
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case 1: _mm_stream_si128(_dst++, v6);
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}
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} |