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New implementation of rgb32tobgr32 

The previous implementation segfaulted with MMX enabled when fed an image
smaller than the size of the units the MMX code processed. The new code:
- is faster for MMX, MMX2 and plain C
- processes small images correctly
- is LGPL

Originally committed as revision 23009 to svn://svn.mplayerhq.hu/mplayer/trunk/libswscale
This commit is contained in:
Ivo van Poorten 2007-04-16 21:41:03 +00:00
parent 4f99f93268
commit b38d487466
1 changed files with 57 additions and 40 deletions
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97
libswscale/rgb2rgb_template.c
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@ -1364,49 +1364,66 @@ static inline void RENAME(rgb16to32)(const uint8_t *src, uint8_t *dst, long src_
static inline void RENAME(rgb32tobgr32)(const uint8_t *src, uint8_t *dst, long src_size)
{
uint8_t *d = dst, *s = (uint8_t *) src;
const uint8_t *end = s + src_size;
#ifdef HAVE_MMX
/* TODO: unroll this loop */
asm volatile (
"xor %%"REG_a", %%"REG_a" \n\t"
ASMALIGN(4)
"1: \n\t"
PREFETCH" 32(%0, %%"REG_a") \n\t"
"movq (%0, %%"REG_a"), %%mm0 \n\t"
"movq %%mm0, %%mm1 \n\t"
"movq %%mm0, %%mm2 \n\t"
"pslld $16, %%mm0 \n\t"
"psrld $16, %%mm1 \n\t"
"pand "MANGLE(mask32r)", %%mm0 \n\t"
"pand "MANGLE(mask32g)", %%mm2 \n\t"
"pand "MANGLE(mask32b)", %%mm1 \n\t"
"por %%mm0, %%mm2 \n\t"
"por %%mm1, %%mm2 \n\t"
MOVNTQ" %%mm2, (%1, %%"REG_a") \n\t"
"add $8, %%"REG_a" \n\t"
"cmp %2, %%"REG_a" \n\t"
" jb 1b \n\t"
:: "r" (src), "r"(dst), "r" (src_size-7)
: "%"REG_a
);
__asm __volatile(SFENCE:::"memory");
__asm __volatile(EMMS:::"memory");
#else
unsigned i;
unsigned num_pixels = src_size >> 2;
for(i=0; i<num_pixels; i++)
{
#ifdef WORDS_BIGENDIAN
dst[4*i + 1] = src[4*i + 3];
dst[4*i + 2] = src[4*i + 2];
dst[4*i + 3] = src[4*i + 1];
#else
dst[4*i + 0] = src[4*i + 2];
dst[4*i + 1] = src[4*i + 1];
dst[4*i + 2] = src[4*i + 0];
__asm __volatile(
" "PREFETCH" (%1) \n"
" movq %3, %%mm7 \n"
" pxor %4, %%mm7 \n"
" movq %%mm7, %%mm6 \n"
" pxor %5, %%mm7 \n"
" jmp 2f \n"
ASMALIGN(4)
"1: \n"
" "PREFETCH" 32(%1) \n"
" movq (%1), %%mm0 \n"
" movq 8(%1), %%mm1 \n"
# ifdef HAVE_MMX2
" pshufw $177, %%mm0, %%mm3 \n"
" pshufw $177, %%mm1, %%mm5 \n"
" pand %%mm7, %%mm0 \n"
" pand %%mm6, %%mm3 \n"
" pand %%mm7, %%mm1 \n"
" pand %%mm6, %%mm5 \n"
" por %%mm3, %%mm0 \n"
" por %%mm5, %%mm1 \n"
# else
" movq %%mm0, %%mm2 \n"
" movq %%mm1, %%mm4 \n"
" pand %%mm7, %%mm0 \n"
" pand %%mm6, %%mm2 \n"
" pand %%mm7, %%mm1 \n"
" pand %%mm6, %%mm4 \n"
" movq %%mm2, %%mm3 \n"
" movq %%mm4, %%mm5 \n"
" pslld $16, %%mm2 \n"
" psrld $16, %%mm3 \n"
" pslld $16, %%mm4 \n"
" psrld $16, %%mm5 \n"
" por %%mm2, %%mm0 \n"
" por %%mm4, %%mm1 \n"
" por %%mm3, %%mm0 \n"
" por %%mm5, %%mm1 \n"
# endif
" "MOVNTQ" %%mm0, (%0) \n"
" "MOVNTQ" %%mm1, 8(%0) \n"
" add $16, %0 \n"
" add $16, %1 \n"
"2: \n"
" cmp %1, %2 \n"
" ja 1b \n"
" "SFENCE" \n"
" "EMMS" \n"
: "+r"(d), "+r"(s)
: "r" (end-15), "m" (mask32b), "m" (mask32r), "m" (mmx_one)
: "memory");
#endif
for (; s<end; s+=4, d+=4) {
int v = *(uint32_t *)s, g = v & 0xff00;
v &= 0xff00ff;
*(uint32_t *)d = (v>>16) + g + (v<<16);
}
#endif
}
static inline void RENAME(rgb24tobgr24)(const uint8_t *src, uint8_t *dst, long src_size)