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add rounding bias before the horizontal idct (765->730 dezicyles on duron) 

Originally committed as revision 4330 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-06-01 01:18:41 +00:00
parent 1d62fc8560
commit 1f3dbc09b1
1 changed files with 3 additions and 2 deletions
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5
libavcodec/i386/idct_mmx.c
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@ -641,7 +641,6 @@ declare_idct (ff_mmx_idct, mmx_table,
#define STORE_DIFF_4P( p, t, pw32, z, dst ) \
asm volatile(\
"paddw "#pw32", "#p" \n\t"\
"psraw $6, "#p" \n\t"\
"movd (%0), "#t" \n\t"\
"punpcklbw "#z", "#t" \n\t"\
@ -665,9 +664,12 @@ void ff_h264_idct_add_mmx2(uint8_t *dst, int16_t *block, int stride)
/* mm1=s02+s13 mm2=s02-s13 mm4=d02+d13 mm0=d02-d13 */
IDCT4_1D( %%mm2, %%mm1, %%mm0, %%mm3, %%mm4, %%mm5 )
"movq ff_pw_32, %%mm6 \n\t"
/* in: 1,4,0,2 out: 1,2,3,0 */
TRANSPOSE4( %%mm1, %%mm4, %%mm0, %%mm2, %%mm3 )
"paddw %%mm6, %%mm1 \n\t"
/* mm2=s02+s13 mm3=s02-s13 mm4=d02+d13 mm1=d02-d13 */
IDCT4_1D( %%mm3, %%mm2, %%mm1, %%mm0, %%mm4, %%mm5 )
@ -675,7 +677,6 @@ void ff_h264_idct_add_mmx2(uint8_t *dst, int16_t *block, int stride)
TRANSPOSE4( %%mm2, %%mm4, %%mm1, %%mm3, %%mm0 )
"pxor %%mm7, %%mm7 \n\t"
"movq ff_pw_32, %%mm6 \n\t"
:: );
STORE_DIFF_4P( %%mm2, %%mm4, %%mm6, %%mm7, &dst[0*stride] );