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reordering instructions a little in decode_significance_x86() -> 2 instructions less / 1% faster decode_residual on P3

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Originally committed as revision 6741 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 19 years ago
parent 13404b2e98
commit a616db285a
1 changed files with 5 additions and 7 deletions
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  1. 12
      libavcodec/cabac.h

12
libavcodec/cabac.h
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@ -684,11 +684,13 @@ static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *sign
"2: \n\t"
BRANCHLESS_GET_CABAC("%0", "%3", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
"test $1, %0 \n\t"
"test $1, %%edx \n\t"
" jz 3f \n\t"
BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx", "%%bx", "%%esi", "%%eax", "%%al")
"movl %2, %%eax \n\t"
"movl %4, %%ecx \n\t"
"addl %1, %%ecx \n\t"
@ -696,9 +698,7 @@ static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *sign
"addl $4, %%eax \n\t"
"movl %%eax, %2 \n\t"
BRANCHLESS_GET_CABAC("%0", "%3", "61(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
"test $1, %%eax \n\t"
"test $1, %%edx \n\t"
" jnz 4f \n\t"
"3: \n\t"
@ -710,9 +710,7 @@ static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *sign
"addl %1, %%ecx \n\t"
"movl %%ecx, (%%eax) \n\t"
"addl $4, %%eax \n\t"
"movl %%eax, %2 \n\t"
"4: \n\t"
"movl %2, %%eax \n\t"
"addl %6, %%eax \n\t"
"shr $2, %%eax \n\t"

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