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slightly change horizontal lift3 so it needs 1 bit less headroom

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Originally committed as revision 10159 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2007-08-20 23:02:59 +00:00
parent be3b22f9ca
commit eee649d3b5
1 changed files with 6 additions and 6 deletions
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12
libavcodec/i386/snowdsp_mmx.c
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@ -333,18 +333,18 @@ void ff_snow_horizontal_compose97i_mmx(DWTELEM *b, int width){
"movq 12(%1), %%mm6 \n\t"
"paddd (%1), %%mm2 \n\t"
"paddd 8(%1), %%mm6 \n\t"
"movq %%mm2, %%mm0 \n\t"
"movq %%mm6, %%mm4 \n\t"
"pslld $2, %%mm2 \n\t"
"pslld $2, %%mm6 \n\t"
"pxor %%mm0, %%mm0 \n\t" //note: the 2 xor could be avoided if we would flip the rounding direction
"pxor %%mm4, %%mm4 \n\t"
"psubd %%mm2, %%mm0 \n\t"
"psubd %%mm6, %%mm4 \n\t"
"psrad $1, %%mm0 \n\t"
"psrad $1, %%mm4 \n\t"
"movq (%0), %%mm2 \n\t"
"movq 8(%0), %%mm6 \n\t"
"psubd %%mm0, %%mm2 \n\t"
"psubd %%mm4, %%mm6 \n\t"
"movq (%0), %%mm0 \n\t"
"movq 8(%0), %%mm4 \n\t"
"paddd %%mm0, %%mm2 \n\t"
"paddd %%mm4, %%mm6 \n\t"
"movq %%mm2, (%2) \n\t"
"movq %%mm6, 8(%2) \n\t"
:: "r"(&src[i]), "r"(&b[i]), "r"(&temp[i])