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[client] added memcpySSE

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This commit is contained in:
Geoffrey McRae 2017-11-17 14:08:45 +11:00
parent 9de71ed2da
commit 05d83d2311
2 changed files with 99 additions and 1 deletions
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3
client/main.c
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@ -30,6 +30,7 @@ Place, Suite 330, Boston, MA 02111-1307 USA
#include <GL/gl.h>
#include "debug.h"
#include "memcpySSE.h"
#include "KVMGFXHeader.h"
#include "ivshmem/ivshmem.h"
#include "spice/spice.h"
@ -53,7 +54,7 @@ struct KVMGFXState state;
void compFunc_NONE(uint8_t * dst, const uint8_t * src, const size_t len)
{
memcpy(dst, src, len);
memcpySSE(dst, src, len);
}
void compFunc_BLACK_RLE(uint8_t * dst, const uint8_t * src, const size_t len)

97
common/memcpySSE.h Normal file
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@ -0,0 +1,97 @@
/*
KVMGFX Client - A KVM Client for VGA Passthrough
Copyright (C) 2017 Geoffrey McRae <geoff@hostfission.com>
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place, Suite 330, Boston, MA 02111-1307 USA
*/
#pragma once
#include <stdbool.h>
#include <stdint.h>
#include <string.h>
#include <tmmintrin.h>
#include <immintrin.h>
#include "debug.h"
static inline void memcpySSE(void * dst, const void * src, size_t length)
{
// check if we can't perform an aligned copy
if (((uintptr_t)src & 0xF) != ((uintptr_t)dst & 0xF))
{
static bool unalignedDstWarn = false;
if (!unalignedDstWarn)
{
DEBUG_WARN("Memcpy64 unable to perform aligned copy, performance will suffer");
unalignedDstWarn = true;
}
// fallback to system memcpy
memcpy(dst, src, length);
return;
}
// check if the source needs alignment
{
uint8_t * _src = (uint8_t *)src;
unsigned int count = (16 - ((uintptr_t)src & 0xF)) & 0xF;
static bool unalignedSrcWarn = false;
if (count > 0)
{
if (!unalignedSrcWarn)
{
DEBUG_WARN("Memcpy64 unaligned source, performance will suffer");
unalignedSrcWarn = true;
}
uint8_t * _dst = (uint8_t *)dst;
for (unsigned int i = count; i > 0; --i)
*_dst++ = *_src++;
src = _src;
dst = _dst;
length -= count;
}
}
__m128i * _src = (__m128i *)src;
__m128i * _dst = (__m128i *)dst;
__m128i * _end = (__m128i *)src + (length / 16);
for (; _src != _end; _src += 8, _dst += 8)
{
_mm_prefetch(((char *)_src + 8 ), _MM_HINT_NTA);
_mm_prefetch(((char *)_src + 9 ), _MM_HINT_NTA);
_mm_prefetch(((char *)_src + 10), _MM_HINT_NTA);
_mm_prefetch(((char *)_src + 11), _MM_HINT_NTA);
__m128i v0 = _mm_load_si128(_src + 0);
__m128i v1 = _mm_load_si128(_src + 1);
__m128i v2 = _mm_load_si128(_src + 2);
__m128i v3 = _mm_load_si128(_src + 3);
__m128i v4 = _mm_load_si128(_src + 4);
__m128i v5 = _mm_load_si128(_src + 5);
__m128i v6 = _mm_load_si128(_src + 6);
__m128i v7 = _mm_load_si128(_src + 7);
_mm_stream_si128(_dst + 0, v0);
_mm_stream_si128(_dst + 1, v1);
_mm_stream_si128(_dst + 2, v2);
_mm_stream_si128(_dst + 3, v3);
_mm_stream_si128(_dst + 4, v4);
_mm_stream_si128(_dst + 5, v5);
_mm_stream_si128(_dst + 6, v6);
_mm_stream_si128(_dst + 7, v7);
}
}