[SCM] libav/experimental: reordering instructions a little in decode_significance_x86() -> 2 instructions less / 1% faster decode_residual on P3
siretart at users.alioth.debian.org
siretart at users.alioth.debian.org
Sun Jun 30 15:52:26 UTC 2013
The following commit has been merged in the experimental branch:
commit a616db285a1765f81887ed874cfa6ee95429ce0a
Author: Michael Niedermayer <michaelni at gmx.at>
Date: Fri Oct 20 00:51:04 2006 +0000
reordering instructions a little in decode_significance_x86() -> 2 instructions less / 1% faster decode_residual on P3
Originally committed as revision 6741 to svn://svn.ffmpeg.org/ffmpeg/trunk
diff --git a/libavcodec/cabac.h b/libavcodec/cabac.h
index 9bea58b..5cf1a9e 100644
--- a/libavcodec/cabac.h
+++ b/libavcodec/cabac.h
@@ -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"
--
Libav/FFmpeg packaging
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