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adds some useful comments after some of the #else, #elseif,

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#endif preprocessor directives to make it clearer which code
block depends on which #define xx

Originally committed as revision 6668 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Guillaume Poirier 2006-10-12 07:51:18 +00:00
parent 28146a8c7a
commit a0490b324a
1 changed files with 8 additions and 8 deletions
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16
libavcodec/cabac.h
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@ -449,7 +449,7 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
: "%ecx", "%ebx", "%edx", "%esi"
);
bit&=1;
#else
#else /* BRANCHLESS_CABAC_DECODER */
asm volatile(
"movzbl (%1), %%eax \n\t"
"movl "RANGE "(%2), %%ebx \n\t"
@ -467,7 +467,7 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"andl %%ecx, %%edx \n\t"
"subl %%edx, %%ebx \n\t"
"xorl %%ecx, %%eax \n\t"
#else
#else /* CMOV_IS_FAST */
"movl %%edx, %%ecx \n\t"
"subl %%ebx, %%edx \n\t"
"sarl $31, %%edx \n\t" //lps_mask
@ -477,7 +477,7 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
"andl %%edx, %%ecx \n\t"
"subl %%ecx, %%ebx \n\t"
"xorl %%edx, %%eax \n\t"
#endif
#endif /* CMOV_IS_FAST */
//eax:state ebx:low edx:mask esi:range
"movzbl "MANGLE(ff_h264_mps_state)"(%%eax), %%ecx \n\t"
@ -519,8 +519,8 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
: "%ecx", "%ebx", "%edx", "%esi"
);
bit&=1;
#endif
#else
#endif /* BRANCHLESS_CABAC_DECODER */
#else /* ARCH_X86 */
int s = *state;
int RangeLPS= ff_h264_lps_range[s][c->range>>(CABAC_BITS+7)]<<(CABAC_BITS+1);
int bit, lps_mask attribute_unused;
@ -543,7 +543,7 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
refill2(c);
}
}
#else
#else /* BRANCHLESS_CABAC_DECODER */
lps_mask= (c->range - c->low)>>31;
c->low -= c->range & lps_mask;
@ -558,8 +558,8 @@ static int get_cabac(CABACContext *c, uint8_t * const state){
c->low <<= lps_mask;
if(!(c->low & CABAC_MASK))
refill2(c);
#endif
#endif
#endif /* BRANCHLESS_CABAC_DECODER */
#endif /* ARCH_X86 */
return bit;
}