write cabac low and range variables as early as possible to prevent stalls...

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)


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@6657 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavcodec/cabac.h

@@ -478,8 +478,10 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
 
         "shr $19, %%esi                         \n\t"
         "movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx   \n\t"
-        "shll %%cl, %%ebx                       \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"
         " jnz 1f                                \n\t"
 
@@ -500,9 +502,8 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
 
         "shll %%cl , %%esi                      \n\t"
         "addl %%esi, %%ebx                      \n\t"
-        "1:                                     \n\t"
-        "movl %%edx, "RANGE    "(%2)            \n\t"
         "movl %%ebx, "LOW      "(%2)            \n\t"
+        "1:                                     \n\t"
         :"=&a"(bit)
         :"r"(state), "r"(c)
         : "%ecx", "%ebx", "%edx", "%esi"