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sws/x86: improve rounding for yuv2yuvX

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This tries to compensate for the errors introduced by
the rounding of pmulhw

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-02-15 21:08:51 +01:00
parent 5ad43af9a6
commit 5e947aeb59
2 changed files with 23 additions and 2 deletions
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12
libswscale/x86/swscale.c
View File

@ -226,10 +226,20 @@ static void yuv2yuvX_sse3(const int16_t *filter, int filterSize,
:: "r"(dither)
);
}
filterSize--;
__asm__ volatile(
"pxor %%xmm0, %%xmm0\n\t"
"punpcklbw %%xmm0, %%xmm3\n\t"
"psraw $4, %%xmm3\n\t"
"movd %0, %%xmm1\n\t"
"punpcklwd %%xmm1, %%xmm1\n\t"
"punpckldq %%xmm1, %%xmm1\n\t"
"punpcklqdq %%xmm1, %%xmm1\n\t"
"psllw $3, %%xmm1\n\t"
"paddw %%xmm1, %%xmm3\n\t"
"psraw $4, %%xmm3\n\t"
::"m"(filterSize)
);
__asm__ volatile(
"movdqa %%xmm3, %%xmm4\n\t"
"movdqa %%xmm3, %%xmm7\n\t"
"movl %3, %%ecx\n\t"

13
libswscale/x86/swscale_template.c
View File

@ -71,9 +71,20 @@ static void RENAME(yuv2yuvX)(const int16_t *filter, int filterSize,
const uint8_t *dither, int offset)
{
dither_8to16(dither, offset);
__asm__ volatile(\
filterSize--;
__asm__ volatile(
"movd %0, %%mm1\n\t"
"punpcklwd %%mm1, %%mm1\n\t"
"punpckldq %%mm1, %%mm1\n\t"
"psllw $3, %%mm1\n\t"
"paddw %%mm1, %%mm3\n\t"
"paddw %%mm1, %%mm4\n\t"
"psraw $4, %%mm3\n\t"
"psraw $4, %%mm4\n\t"
::"m"(filterSize)
);
__asm__ volatile(\
"movq %%mm3, %%mm6\n\t"
"movq %%mm4, %%mm7\n\t"
"movl %3, %%ecx\n\t"