har0ke/FFmpeg
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

cabac: remove inline asm under #if 0

Browse Source 
A comment says it's not faster than the C code.

Signed-off-by: Mans Rullgard <mans@mansr.com>
This commit is contained in:
Mans Rullgard 2011-06-20 01:58:36 +01:00
parent 8fcc0e7978
commit 34ee43fc0f
1 changed files with 0 additions and 31 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
libavcodec/cabac.h
View File

@ -423,36 +423,6 @@ static int av_unused get_cabac(CABACContext *c, uint8_t * const state){
}
static int av_unused get_cabac_bypass(CABACContext *c){
#if 0 //not faster
int bit;
__asm__ volatile(
"movl "RANGE "(%1), %%ebx \n\t"
"movl "LOW "(%1), %%eax \n\t"
"shl $17, %%ebx \n\t"
"add %%eax, %%eax \n\t"
"sub %%ebx, %%eax \n\t"
"cltd \n\t"
"and %%edx, %%ebx \n\t"
"add %%ebx, %%eax \n\t"
"test %%ax, %%ax \n\t"
" jnz 1f \n\t"
"movl "BYTE "(%1), %%"REG_b" \n\t"
"subl $0xFFFF, %%eax \n\t"
"movzwl (%%"REG_b"), %%ecx \n\t"
"bswap %%ecx \n\t"
"shrl $15, %%ecx \n\t"
"addl $2, %%"REG_b" \n\t"
"addl %%ecx, %%eax \n\t"
"movl %%"REG_b", "BYTE "(%1) \n\t"
"1: \n\t"
"movl %%eax, "LOW "(%1) \n\t"
:"=&d"(bit)
:"r"(c)
: "%eax", "%"REG_b, "%ecx", "memory"
);
return bit+1;
#else
int range;
c->low += c->low;
@ -466,7 +436,6 @@ static int av_unused get_cabac_bypass(CABACContext *c){
c->low -= range;
return 1;
}
#endif
}