[OpenDivX] OpenDivX optimalization: +30-40%

["Andrew Woznytsa" <avoznytsa@yahoo.com>]

Hi All,

I'm quite confused...

look below and compare these algorithms.. results will be the same but
perfomance gain will be 30-40%..

regards,

Andrew

decoder/mp4_mblock.c/macroblock(), line 120:

1. original algorithm:

  // motion compensation
  if (interFlag)
  {
   reconstruct(mp4_hdr.mb_xpos, mp4_hdr.mb_ypos, mp4_hdr.derived_mb_type);

   // texture decoding add
   for (j = 0; j < 6; j++) {
    int coded = mp4_hdr.cbp & (1 << (5 - j));

    blockInter(j, (coded != 0));
    addblockInter(j, mp4_hdr.mb_xpos, mp4_hdr.mb_ypos);
   }
  }
  else
  {
   // texture decoding add
[skiped]

2. my version

  // motion compensation
  if (interFlag)
  {
   reconstruct(mp4_hdr.mb_xpos, mp4_hdr.mb_ypos, mp4_hdr.derived_mb_type);

   // texture decoding add
   for (j = 0; j < 6; j++) {
    int coded = mp4_hdr.cbp & (1 << (5 - j));
    if(coded){
         blockInter(j, (coded != 0));
         addblockInter(j, mp4_hdr.mb_xpos, mp4_hdr.mb_ypos);
    }
  }
  else
  {
   // texture decoding add
[skiped]


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