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write cabac low and range variables as early as possible to prevent stalls from reading them before they where written, the P4 is said to disslike that alot, on P3 its 2% faster (START/STOP_TIMER over decode_residual)

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Originally committed as revision 6657 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2006-10-11 16:11:41 +00:00
parent d17faef011
commit b99f3cabed
1 changed files with 4 additions and 3 deletions
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7
libavcodec/cabac.h
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@ -478,8 +478,10 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"shr $19, %%esi \n\t" "shr $19, %%esi \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t" "movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
"shll %%cl, %%ebx \n\t"
"shll %%cl, %%edx \n\t" "shll %%cl, %%edx \n\t"
"movl %%edx, "RANGE "(%2) \n\t"
"shll %%cl, %%ebx \n\t"
"movl %%ebx, "LOW "(%2) \n\t"
"test %%bx, %%bx \n\t" "test %%bx, %%bx \n\t"
" jnz 1f \n\t" " jnz 1f \n\t"
@ -500,9 +502,8 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"shll %%cl , %%esi \n\t" "shll %%cl , %%esi \n\t"
"addl %%esi, %%ebx \n\t" "addl %%esi, %%ebx \n\t"
"1: \n\t"
"movl %%edx, "RANGE "(%2) \n\t"
"movl %%ebx, "LOW "(%2) \n\t" "movl %%ebx, "LOW "(%2) \n\t"
"1: \n\t"
:"=&a"(bit) :"=&a"(bit)
:"r"(state), "r"(c) :"r"(state), "r"(c)
: "%ecx", "%ebx", "%edx", "%esi" : "%ecx", "%ebx", "%edx", "%esi"