videodsp_ppc.c

   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
  33 av_cold void ff_videodsp_init_ppc(VideoDSPContext *ctx, int bpc)
  34 {
  35     ctx->prefetch = prefetch_ppc;
  36 }