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factor out common subexprssion (gcc of course is too stupid to do this ...)

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5% faster avg_h264_chroma_mc2_mmx2()
10% faster put_h264_chroma_mc2_mmx2()

Originally committed as revision 7898 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-02-09 12:37:38 +00:00
parent 9301a0b4a9
commit 7c4fd7eb0c
1 changed files with 3 additions and 2 deletions
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5
libavcodec/i386/dsputil_h264_template_mmx.c
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@ -265,8 +265,9 @@ static void H264_CHROMA_MC4_TMPL(uint8_t *dst/*align 4*/, uint8_t *src/*align 1*
#ifdef H264_CHROMA_MC2_TMPL
static void H264_CHROMA_MC2_TMPL(uint8_t *dst/*align 2*/, uint8_t *src/*align 1*/, int stride, int h, int x, int y)
{
int CD=((1<<16)-1)*x*y + 8*y;
int AB=((8<<16)-8)*x + 64 - CD;
int tmp = ((1<<16)-1)*x + 8;
int CD= tmp*y;
int AB= (tmp<<3) - CD;
asm volatile(
/* mm5 = {A,B,A,B} */
/* mm6 = {C,D,C,D} */