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videodsp_ppc.c
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1 /*
2  * Copyright (c) 2003-2004 Romain Dolbeau
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include "libavutil/attributes.h"
22 #include "libavcodec/videodsp.h"
23 
24 static void prefetch_ppc(uint8_t *mem, ptrdiff_t stride, int h)
25 {
26  register const uint8_t *p = mem;
27  do {
28  __asm__ volatile ("dcbt 0,%0" : : "r" (p));
29  p += stride;
30  } while(--h);
31 }
32 
34 {
35  ctx->prefetch = prefetch_ppc;
36 }