[SCM] libav/experimental: avoid an overflow in the 1 horizontal lifting step
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 16:06:00 UTC 2013
The following commit has been merged in the experimental branch:
commit b696a4c91d5f2b30310eb762beeb225292d94b44
Author: Michael Niedermayer <michaelni at gmx.at>
Date: Sat Aug 25 19:04:33 2007 +0000
avoid an overflow in the 1 horizontal lifting step
Originally committed as revision 10225 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/i386/snowdsp_mmx.c b/libavcodec/i386/snowdsp_mmx.c
index 4fad6f8..6deaad2 100644
--- a/libavcodec/i386/snowdsp_mmx.c
+++ b/libavcodec/i386/snowdsp_mmx.c
@@ -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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