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merge a few asm blocks so gcc cant unoptimize it (658->631 dezicycles on duron) 

Originally committed as revision 4334 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2005-06-01 11:56:58 +00:00
parent 987ae784e6
commit 6510f43cf3
1 changed files with 13 additions and 7 deletions
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20
libavcodec/i386/idct_mmx.c
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@ -637,14 +637,13 @@ declare_idct (ff_mmx_idct, mmx_table,
SBUTTERFLY( a, c, d, dq ) /* a=aeim d=bfjn */\
SBUTTERFLY( t, b, c, dq ) /* t=cgko c=dhlp */
#define STORE_DIFF_4P( p, t, z, dst ) \
asm volatile(\
#define STORE_DIFF_4P( p, t, z ) \
"psraw $6, "#p" \n\t"\
"movd (%0), "#t" \n\t"\
"punpcklbw "#z", "#t" \n\t"\
"paddsw "#t", "#p" \n\t"\
"packuswb "#z", "#p" \n\t"\
"movd "#p", (%0) \n\t" :: "r"(dst) )
"movd "#p", (%0) \n\t"
static const uint64_t ff_pw_32 attribute_used __attribute__ ((aligned(8))) = 0x0020002000200020ULL;
@ -674,8 +673,15 @@ void ff_h264_idct_add_mmx2(uint8_t *dst, int16_t *block, int stride)
"pxor %%mm7, %%mm7 \n\t"
:: "m"(ff_pw_32));
STORE_DIFF_4P( %%mm0, %%mm1, %%mm7, &dst[0*stride] );
STORE_DIFF_4P( %%mm2, %%mm1, %%mm7, &dst[1*stride] );
STORE_DIFF_4P( %%mm3, %%mm1, %%mm7, &dst[2*stride] );
STORE_DIFF_4P( %%mm4, %%mm1, %%mm7, &dst[3*stride] );
asm volatile(
STORE_DIFF_4P( %%mm0, %%mm1, %%mm7)
"addl %1, %0 \n\t"
STORE_DIFF_4P( %%mm2, %%mm1, %%mm7)
"addl %1, %0 \n\t"
STORE_DIFF_4P( %%mm3, %%mm1, %%mm7)
"addl %1, %0 \n\t"
STORE_DIFF_4P( %%mm4, %%mm1, %%mm7)
: "+r"(dst)
: "r" (stride)
);
}