mirror of https://github.com/mpv-player/mpv
136 lines
4.5 KiB
C
136 lines
4.5 KiB
C
/*
|
|
* Copyright (C) 2011-2014 Hendrik Leppkes
|
|
* http://www.1f0.de
|
|
*
|
|
* 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.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Taken from the QuickSync decoder by Eric Gur
|
|
*/
|
|
|
|
#pragma GCC push_options
|
|
#pragma GCC target("sse4.1")
|
|
#include <smmintrin.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <string.h>
|
|
|
|
#include "gpu_memcpy.h"
|
|
|
|
// gpu_memcpy is a memcpy style function that copied data very fast from a
|
|
// GPU tiled memory (write back)
|
|
// Performance tip: page offset (12 lsb) of both addresses should be different
|
|
// optimally use a 2K offset between them.
|
|
void *gpu_memcpy(void *restrict d, const void *restrict s, size_t size)
|
|
{
|
|
static const size_t regsInLoop = sizeof(size_t) * 2; // 8 or 16
|
|
|
|
if (d == NULL || s == NULL) return NULL;
|
|
|
|
// If memory is not aligned, use memcpy
|
|
bool isAligned = (((size_t)(s) | (size_t)(d)) & 0xF) == 0;
|
|
if (!isAligned)
|
|
{
|
|
return memcpy(d, s, size);
|
|
}
|
|
|
|
__m128i xmm0, xmm1, xmm2, xmm3, xmm4, xmm5, xmm6, xmm7;
|
|
#ifdef __x86_64__
|
|
__m128i xmm8, xmm9, xmm10, xmm11, xmm12, xmm13, xmm14, xmm15;
|
|
#endif
|
|
|
|
size_t reminder = size & (regsInLoop * sizeof(xmm0) - 1); // Copy 128 or 256 bytes every loop
|
|
size_t end = 0;
|
|
|
|
__m128i* pTrg = (__m128i*)d;
|
|
__m128i* pTrgEnd = pTrg + ((size - reminder) >> 4);
|
|
__m128i* pSrc = (__m128i*)s;
|
|
|
|
// Make sure source is synced - doesn't hurt if not needed.
|
|
_mm_sfence();
|
|
|
|
while (pTrg < pTrgEnd)
|
|
{
|
|
// _mm_stream_load_si128 emits the Streaming SIMD Extensions 4 (SSE4.1) instruction MOVNTDQA
|
|
// Fastest method for copying GPU RAM. Available since Penryn (45nm Core 2 Duo/Quad)
|
|
xmm0 = _mm_stream_load_si128(pSrc);
|
|
xmm1 = _mm_stream_load_si128(pSrc + 1);
|
|
xmm2 = _mm_stream_load_si128(pSrc + 2);
|
|
xmm3 = _mm_stream_load_si128(pSrc + 3);
|
|
xmm4 = _mm_stream_load_si128(pSrc + 4);
|
|
xmm5 = _mm_stream_load_si128(pSrc + 5);
|
|
xmm6 = _mm_stream_load_si128(pSrc + 6);
|
|
xmm7 = _mm_stream_load_si128(pSrc + 7);
|
|
#ifdef __x86_64__ // Use all 16 xmm registers
|
|
xmm8 = _mm_stream_load_si128(pSrc + 8);
|
|
xmm9 = _mm_stream_load_si128(pSrc + 9);
|
|
xmm10 = _mm_stream_load_si128(pSrc + 10);
|
|
xmm11 = _mm_stream_load_si128(pSrc + 11);
|
|
xmm12 = _mm_stream_load_si128(pSrc + 12);
|
|
xmm13 = _mm_stream_load_si128(pSrc + 13);
|
|
xmm14 = _mm_stream_load_si128(pSrc + 14);
|
|
xmm15 = _mm_stream_load_si128(pSrc + 15);
|
|
#endif
|
|
pSrc += regsInLoop;
|
|
// _mm_store_si128 emit the SSE2 instruction MOVDQA (aligned store)
|
|
_mm_store_si128(pTrg , xmm0);
|
|
_mm_store_si128(pTrg + 1, xmm1);
|
|
_mm_store_si128(pTrg + 2, xmm2);
|
|
_mm_store_si128(pTrg + 3, xmm3);
|
|
_mm_store_si128(pTrg + 4, xmm4);
|
|
_mm_store_si128(pTrg + 5, xmm5);
|
|
_mm_store_si128(pTrg + 6, xmm6);
|
|
_mm_store_si128(pTrg + 7, xmm7);
|
|
#ifdef __x86_64__ // Use all 16 xmm registers
|
|
_mm_store_si128(pTrg + 8, xmm8);
|
|
_mm_store_si128(pTrg + 9, xmm9);
|
|
_mm_store_si128(pTrg + 10, xmm10);
|
|
_mm_store_si128(pTrg + 11, xmm11);
|
|
_mm_store_si128(pTrg + 12, xmm12);
|
|
_mm_store_si128(pTrg + 13, xmm13);
|
|
_mm_store_si128(pTrg + 14, xmm14);
|
|
_mm_store_si128(pTrg + 15, xmm15);
|
|
#endif
|
|
pTrg += regsInLoop;
|
|
}
|
|
|
|
// Copy in 16 byte steps
|
|
if (reminder >= 16)
|
|
{
|
|
size = reminder;
|
|
reminder = size & 15;
|
|
end = size >> 4;
|
|
for (size_t i = 0; i < end; ++i)
|
|
{
|
|
pTrg[i] = _mm_stream_load_si128(pSrc + i);
|
|
}
|
|
}
|
|
|
|
// Copy last bytes - shouldn't happen as strides are modulu 16
|
|
if (reminder)
|
|
{
|
|
__m128i temp = _mm_stream_load_si128(pSrc + end);
|
|
|
|
char* ps = (char*)(&temp);
|
|
char* pt = (char*)(pTrg + end);
|
|
|
|
for (size_t i = 0; i < reminder; ++i)
|
|
{
|
|
pt[i] = ps[i];
|
|
}
|
|
}
|
|
|
|
return d;
|
|
}
|