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slightly faster on P3 slightly slower on athlon and probably faster on P4

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Originally committed as revision 6663 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-10-11 17:59:40 +00:00
parent f3239539b9
commit 1f4d5e9f69
1 changed files with 10 additions and 0 deletions
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10
libavcodec/cabac.h
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@ -382,10 +382,20 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"subl %%esi, %%edx \n\t"
"cmpl %%edx, %%ebx \n\t"
" ja 1f \n\t"
#if 1
//athlon:4067 P3:4110
"lea -0x2000000(%%edx), %%ecx \n\t"
"shr $31, %%ecx \n\t"
"shl %%cl, %%edx \n\t"
"shl %%cl, %%ebx \n\t"
#else
//athlon:4057 P3:4130
"cmp $0x2000000, %%edx \n\t" //FIXME avoidable
"setb %%cl \n\t"
"shl %%cl, %%edx \n\t"
"shl %%cl, %%ebx \n\t"
#endif
"movzbl "MANGLE(ff_h264_mps_state)"(%%eax), %%ecx \n\t"
"movb %%cl, (%1) \n\t"
//eax:state ebx:low, edx:range, esi:RangeLPS