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avoid an overflow in the 1 horizontal lifting step

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Originally committed as revision 10225 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 18 years ago
parent 9caa1cccb9
commit b696a4c91d
1 changed files with 12 additions and 12 deletions
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  1. 24
      libavcodec/i386/snowdsp_mmx.c

24
libavcodec/i386/snowdsp_mmx.c
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@ -43,7 +43,7 @@ void ff_snow_horizontal_compose97i_sse2(IDWTELEM *b, int width){
asm volatile(
"pcmpeqd %%xmm7, %%xmm7 \n\t"
"psllw $15, %%xmm7 \n\t"
"psrlw $13, %%xmm7 \n\t"
"psrlw $14, %%xmm7 \n\t"
::);
for(; i<w_l-15; i+=16){
asm volatile(
@ -55,14 +55,14 @@ void ff_snow_horizontal_compose97i_sse2(IDWTELEM *b, int width){
"paddw %%xmm5, %%xmm6 \n\t"
"movdqa %%xmm2, %%xmm0 \n\t"
"movdqa %%xmm6, %%xmm4 \n\t"
"paddw %%xmm2, %%xmm2 \n\t"
"paddw %%xmm6, %%xmm6 \n\t"
"psraw $1, %%xmm0 \n\t"
"psraw $1, %%xmm4 \n\t"
"paddw %%xmm0, %%xmm2 \n\t"
"paddw %%xmm4, %%xmm6 \n\t"
"paddw %%xmm7, %%xmm2 \n\t"
"paddw %%xmm7, %%xmm6 \n\t"
"psraw $3, %%xmm2 \n\t"
"psraw $3, %%xmm6 \n\t"
"psraw $2, %%xmm2 \n\t"
"psraw $2, %%xmm6 \n\t"
"movdqa (%0), %%xmm0 \n\t"
"movdqa 16(%0), %%xmm4 \n\t"
"psubw %%xmm2, %%xmm0 \n\t"
@ -111,7 +111,7 @@ void ff_snow_horizontal_compose97i_sse2(IDWTELEM *b, int width){
i = 0;
asm volatile(
"psllw $1, %%xmm7 \n\t"
"psllw $2, %%xmm7 \n\t"
::);
for(; i<w_l-15; i+=16){
asm volatile(
@ -228,7 +228,7 @@ void ff_snow_horizontal_compose97i_mmx(IDWTELEM *b, int width){
asm volatile(
"pcmpeqw %%mm7, %%mm7 \n\t"
"psllw $15, %%mm7 \n\t"
"psrlw $13, %%mm7 \n\t"
"psrlw $14, %%mm7 \n\t"
::);
for(; i<w_l-7; i+=8){
asm volatile(
@ -238,14 +238,14 @@ void ff_snow_horizontal_compose97i_mmx(IDWTELEM *b, int width){
"paddw 10(%1), %%mm6 \n\t"
"movq %%mm2, %%mm0 \n\t"
"movq %%mm6, %%mm4 \n\t"
"paddw %%mm2, %%mm2 \n\t"
"paddw %%mm6, %%mm6 \n\t"
"psraw $1, %%mm2 \n\t"
"psraw $1, %%mm6 \n\t"
"paddw %%mm0, %%mm2 \n\t"
"paddw %%mm4, %%mm6 \n\t"
"paddw %%mm7, %%mm2 \n\t"
"paddw %%mm7, %%mm6 \n\t"
"psraw $3, %%mm2 \n\t"
"psraw $3, %%mm6 \n\t"
"psraw $2, %%mm2 \n\t"
"psraw $2, %%mm6 \n\t"
"movq (%0), %%mm0 \n\t"
"movq 8(%0), %%mm4 \n\t"
"psubw %%mm2, %%mm0 \n\t"
@ -288,7 +288,7 @@ void ff_snow_horizontal_compose97i_mmx(IDWTELEM *b, int width){
i = 1;
b[0] = b[0] + (((2 * ref[1] + W_BO) + 4 * b[0]) >> W_BS);
asm volatile(
"psllw $1, %%mm7 \n\t"
"psllw $2, %%mm7 \n\t"
::);
for(; i<w_l-7; i+=8){
asm volatile(

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