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remove idiotc double subtraction from the sse2 code (untested, no sse2 here)

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Originally committed as revision 10158 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 18 years ago
parent 8510c519e7
commit be3b22f9ca
1 changed files with 15 additions and 18 deletions
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  1. 33
      libavcodec/i386/snowdsp_mmx.c

33
libavcodec/i386/snowdsp_mmx.c
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@ -111,7 +111,8 @@ void ff_snow_horizontal_compose97i_sse2(DWTELEM *b, int width){
i = 0;
asm volatile(
"pslld $1, %%xmm7 \n\t" /* xmm7 already holds a '4' from 2 lifts ago. */
"pcmpeqd %%xmm7, %%xmm7 \n\t"
"psrad $29, %%xmm7 \n\t"
::);
for(; i<w_l-7; i+=8){
asm volatile(
@ -121,22 +122,18 @@ void ff_snow_horizontal_compose97i_sse2(DWTELEM *b, int width){
"movdqu 20(%1), %%xmm4 \n\t" //FIXME try aligned reads and shifts
"paddd %%xmm1, %%xmm0 \n\t"
"paddd %%xmm5, %%xmm4 \n\t"
"movdqa %%xmm7, %%xmm1 \n\t"
"movdqa %%xmm7, %%xmm5 \n\t"
"psubd %%xmm0, %%xmm1 \n\t"
"psubd %%xmm4, %%xmm5 \n\t"
"movdqa (%0), %%xmm0 \n\t"
"movdqa 16(%0), %%xmm4 \n\t"
"pslld $2, %%xmm0 \n\t"
"pslld $2, %%xmm4 \n\t"
"psubd %%xmm0, %%xmm1 \n\t"
"psubd %%xmm4, %%xmm5 \n\t"
"psrad $4, %%xmm1 \n\t"
"psrad $4, %%xmm5 \n\t"
"movdqa (%0), %%xmm0 \n\t"
"movdqa 16(%0), %%xmm4 \n\t"
"psubd %%xmm1, %%xmm0 \n\t"
"psubd %%xmm5, %%xmm4 \n\t"
"paddd %%xmm7, %%xmm0 \n\t"
"paddd %%xmm7, %%xmm4 \n\t"
"movdqa (%0), %%xmm1 \n\t"
"movdqa 16(%0), %%xmm5 \n\t"
"psrad $2, %%xmm0 \n\t"
"psrad $2, %%xmm4 \n\t"
"paddd %%xmm1, %%xmm0 \n\t"
"paddd %%xmm5, %%xmm4 \n\t"
"psrad $2, %%xmm0 \n\t"
"psrad $2, %%xmm4 \n\t"
"paddd %%xmm1, %%xmm0 \n\t"
"paddd %%xmm5, %%xmm4 \n\t"
"movdqa %%xmm0, (%0) \n\t"
"movdqa %%xmm4, 16(%0) \n\t"
:: "r"(&b[i]), "r"(&ref[i])
@ -144,7 +141,7 @@ void ff_snow_horizontal_compose97i_sse2(DWTELEM *b, int width){
);
}
snow_horizontal_compose_liftS_lead_out(i, b, b, ref, width, w_l);
b[0] = b_0 - (((-2 * ref[1] + W_BO) - 4 * b_0) >> W_BS);
b[0] = b_0 + ((2 * ref[1] + W_BO-1 + 4 * b_0) >> W_BS);
}
{ // Lift 3

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