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replace a few mov + psrlq with pshufw, there are more cases which could benefit from this but they would require us to duplicate some functions ...

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the trick is from various places (my own code in libpostproc, a patch on the x264 list, ...)

Originally committed as revision 4608 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-09-21 21:17:09 +00:00
parent dc9f52602f
commit 12e9668119
2 changed files with 17 additions and 17 deletions
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6
libavcodec/i386/dsputil_mmx.c
View File

@ -1621,11 +1621,9 @@ static int hadamard8_diff_mmx2(void *s, uint8_t *src1, uint8_t *src2, int stride
"movq 64(%1), %%mm1 \n\t"
MMABS_SUM_MMX2(%%mm1, %%mm7, %%mm0)
"movq %%mm0, %%mm1 \n\t"
"psrlq $32, %%mm0 \n\t"
"pshufw $0x0E, %%mm0, %%mm1 \n\t"
"paddusw %%mm1, %%mm0 \n\t"
"movq %%mm0, %%mm1 \n\t"
"psrlq $16, %%mm0 \n\t"
"pshufw $0x01, %%mm0, %%mm1 \n\t"
"paddusw %%mm1, %%mm0 \n\t"
"movd %%mm0, %0 \n\t"

28
libavcodec/i386/mpegvideo_mmx_template.c
View File

@ -22,7 +22,11 @@
#ifdef HAVE_MMX2
#define SPREADW(a) "pshufw $0, " #a ", " #a " \n\t"
#define PMAXW(a,b) "pmaxsw " #a ", " #b " \n\t"
#define PMAX(a,b) \
"pshufw $0x0E," #a ", " #b " \n\t"\
PMAXW(b, a)\
"pshufw $0x01," #a ", " #b " \n\t"\
PMAXW(b, a)
#else
#define SPREADW(a) \
"punpcklwd " #a ", " #a " \n\t"\
@ -30,6 +34,14 @@
#define PMAXW(a,b) \
"psubusw " #a ", " #b " \n\t"\
"paddw " #a ", " #b " \n\t"
#define PMAX(a,b) \
"movq " #a ", " #b " \n\t"\
"psrlq $32, " #a " \n\t"\
PMAXW(b, a)\
"movq " #a ", " #b " \n\t"\
"psrlq $16, " #a " \n\t"\
PMAXW(b, a)
#endif
static int RENAME(dct_quantize)(MpegEncContext *s,
@ -119,12 +131,7 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
PMAXW(%%mm0, %%mm3)
"add $8, %%"REG_a" \n\t"
" js 1b \n\t"
"movq %%mm3, %%mm0 \n\t"
"psrlq $32, %%mm3 \n\t"
PMAXW(%%mm0, %%mm3)
"movq %%mm3, %%mm0 \n\t"
"psrlq $16, %%mm3 \n\t"
PMAXW(%%mm0, %%mm3)
PMAX(%%mm3, %%mm0)
"movd %%mm3, %%"REG_a" \n\t"
"movzb %%al, %%"REG_a" \n\t" // last_non_zero_p1
: "+a" (last_non_zero_p1)
@ -170,12 +177,7 @@ static int RENAME(dct_quantize)(MpegEncContext *s,
PMAXW(%%mm0, %%mm3)
"add $8, %%"REG_a" \n\t"
" js 1b \n\t"
"movq %%mm3, %%mm0 \n\t"
"psrlq $32, %%mm3 \n\t"
PMAXW(%%mm0, %%mm3)
"movq %%mm3, %%mm0 \n\t"
"psrlq $16, %%mm3 \n\t"
PMAXW(%%mm0, %%mm3)
PMAX(%%mm3, %%mm0)
"movd %%mm3, %%"REG_a" \n\t"
"movzb %%al, %%"REG_a" \n\t" // last_non_zero_p1
: "+a" (last_non_zero_p1)