Chiebot-Mirror
/
FFmpeg
mirror of https://github.com/FFmpeg/FFmpeg.git
8
0
Fork 0
Code Issues Projects Releases Wiki Activity

factorize get_cabac asm (0.5% slower but its much cleaner)

Browse Source 
Originally committed as revision 6740 to svn://svn.ffmpeg.org/ffmpeg/trunk
pull/126/head
Michael Niedermayer 19 years ago
parent 1e4051aaa0
commit 13404b2e98
1 changed files with 59 additions and 168 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 227
      libavcodec/cabac.h

227
libavcodec/cabac.h
Unescape View File

@ -452,71 +452,72 @@ static int always_inline get_cabac_inline(CABACContext *c, uint8_t * const state
);
bit&=1;
#else /* BRANCHLESS_CABAC_DECODER */
asm volatile(
"movzbl (%1), %0 \n\t"
"movl "RANGE "(%2), %%ebx \n\t"
"movl "RANGE "(%2), %%edx \n\t"
"andl $0xC0, %%ebx \n\t"
"movzbl "MANGLE(ff_h264_lps_range)"(%0, %%ebx, 2), %%esi\n\t"
"movl "LOW "(%2), %%ebx \n\t"
//eax:state ebx:low, edx:range, esi:RangeLPS
"subl %%esi, %%edx \n\t"
#if (defined CMOV_IS_FAST && __CPU__ >= 686)
"movl %%edx, %%ecx \n\t"
"shl $17, %%edx \n\t"
"cmpl %%ebx, %%edx \n\t"
"cmova %%ecx, %%esi \n\t"
"sbbl %%ecx, %%ecx \n\t"
"andl %%ecx, %%edx \n\t"
"subl %%edx, %%ebx \n\t"
"xorl %%ecx, %0 \n\t"
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
"mov "tmp" , %%ecx \n\t"\
"shl $17 , "tmp" \n\t"\
"cmp "low" , "tmp" \n\t"\
"cmova %%ecx , "range" \n\t"\
"sbb %%ecx , %%ecx \n\t"\
"and %%ecx , "tmp" \n\t"\
"sub "tmp" , "low" \n\t"\
"xor %%ecx , "ret" \n\t"
#else /* CMOV_IS_FAST */
"movl %%edx, %%ecx \n\t"
"shl $17, %%edx \n\t"
"subl %%ebx, %%edx \n\t"
"sarl $31, %%edx \n\t" //lps_mask
"subl %%ecx, %%esi \n\t" //RangeLPS - range
"andl %%edx, %%esi \n\t" //(RangeLPS - range)&lps_mask
"addl %%ecx, %%esi \n\t" //new range
"shl $17, %%ecx \n\t"
"andl %%edx, %%ecx \n\t"
"subl %%ecx, %%ebx \n\t"
"xorl %%edx, %0 \n\t"
#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
"mov "tmp" , %%ecx \n\t"\
"shl $17 , "tmp" \n\t"\
"sub "low" , "tmp" \n\t"\
"sar $31 , "tmp" \n\t" /*lps_mask*/\
"sub %%ecx , "range" \n\t" /*RangeLPS - range*/\
"and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\
"add %%ecx , "range" \n\t" /*new range*/\
"shl $17 , %%ecx \n\t"\
"and "tmp" , %%ecx \n\t"\
"sub %%ecx , "low" \n\t"\
"xor "tmp" , "ret" \n\t"
#endif /* CMOV_IS_FAST */
//eax:state ebx:low edx:mask esi:range
//eax:bit ebx:low esi:range
#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
"movzbl "statep" , "ret" \n\t"\
"mov "range" , "tmp" \n\t"\
"and $0xC0 , "range" \n\t"\
"movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\
"sub "range" , "tmp" \n\t"\
BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
"movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\
"shl %%cl , "range" \n\t"\
"movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\
"mov "tmpbyte" , "statep" \n\t"\
"shl %%cl , "low" \n\t"\
"test "lowword" , "lowword" \n\t"\
" jnz 1f \n\t"\
"mov "BYTE"("cabac"), %%ecx \n\t"\
"movzwl (%%ecx) , "tmp" \n\t"\
"bswap "tmp" \n\t"\
"shr $15 , "tmp" \n\t"\
"sub $0xFFFF , "tmp" \n\t"\
"add $2 , %%ecx \n\t"\
"mov %%ecx , "BYTE "("cabac") \n\t"\
"lea -1("low") , %%ecx \n\t"\
"xor "low" , %%ecx \n\t"\
"shr $15 , %%ecx \n\t"\
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\
"neg %%ecx \n\t"\
"add $7 , %%ecx \n\t"\
"shl %%cl , "tmp" \n\t"\
"add "tmp" , "low" \n\t"\
"1: \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
"shll %%cl, %%esi \n\t"
"movzbl "MANGLE(ff_h264_mlps_state)"+128(%0), %%edx \n\t"
"movb %%dl, (%1) \n\t"
asm volatile(
"movl "RANGE "(%2), %%esi \n\t"
"movl "LOW "(%2), %%ebx \n\t"
BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
"movl %%esi, "RANGE "(%2) \n\t"
"shll %%cl, %%ebx \n\t"
"movl %%ebx, "LOW "(%2) \n\t"
"test %%bx, %%bx \n\t"
" jnz 1f \n\t"
"movl "BYTE "(%2), %%ecx \n\t"
"movzwl (%%ecx), %%esi \n\t"
"bswap %%esi \n\t"
"shrl $15, %%esi \n\t"
"subl $0xFFFF, %%esi \n\t"
"addl $2, %%ecx \n\t"
"movl %%ecx, "BYTE "(%2) \n\t"
"leal -1(%%ebx), %%ecx \n\t"
"xorl %%ebx, %%ecx \n\t"
"shrl $15, %%ecx \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
"neg %%ecx \n\t"
"add $7, %%ecx \n\t"
"shll %%cl , %%esi \n\t"
"addl %%esi, %%ebx \n\t"
"movl %%ebx, "LOW "(%2) \n\t"
"1: \n\t"
:"=&a"(bit)
:"r"(state), "r"(c)
: "%ecx", "%ebx", "%edx", "%esi", "memory"
@ -683,62 +684,7 @@ static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *sign
"2: \n\t"
"movzbl (%1), %0 \n\t"
"movl %%esi, %%edx \n\t"
"andl $0xC0, %%esi \n\t"
"movzbl "MANGLE(ff_h264_lps_range)"(%0, %%esi, 2), %%esi\n\t"
/*eax:state ebx:low, edx:range, esi:RangeLPS*/
"subl %%esi, %%edx \n\t"
#if (defined CMOV_IS_FAST && __CPU__ >= 686)
"movl %%edx, %%ecx \n\t"
"shl $17, %%edx \n\t"
"cmpl %%ebx, %%edx \n\t"
"cmova %%ecx, %%esi \n\t"
"sbbl %%ecx, %%ecx \n\t"
"andl %%ecx, %%edx \n\t"
"subl %%edx, %%ebx \n\t"
"xorl %%ecx, %0 \n\t"
#else /* CMOV_IS_FAST */
"movl %%edx, %%ecx \n\t"
"shl $17, %%edx \n\t"
"subl %%ebx, %%edx \n\t"
"sarl $31, %%edx \n\t" //lps_mask
"subl %%ecx, %%esi \n\t" //RangeLPS - range
"andl %%edx, %%esi \n\t" //(RangeLPS - range)&lps_mask
"addl %%ecx, %%esi \n\t" //new range
"shl $17, %%ecx \n\t"
"andl %%edx, %%ecx \n\t"
"subl %%ecx, %%ebx \n\t"
"xorl %%edx, %0 \n\t"
#endif /* CMOV_IS_FAST */
"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
"shll %%cl, %%esi \n\t"
"movzbl "MANGLE(ff_h264_mlps_state)"+128(%0), %%edx \n\t"
"movb %%dl, (%1) \n\t"
"shll %%cl, %%ebx \n\t"
"test %%bx, %%bx \n\t"
" jnz 1f \n\t"
"movl "BYTE "(%3), %%ecx \n\t"
"movzwl (%%ecx), %%edx \n\t"
"bswap %%edx \n\t"
"shrl $15, %%edx \n\t"
"subl $0xFFFF, %%edx \n\t"
"addl $2, %%ecx \n\t"
"movl %%ecx, "BYTE "(%3) \n\t"
"leal -1(%%ebx), %%ecx \n\t"
"xorl %%ebx, %%ecx \n\t"
"shrl $15, %%ecx \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
"neg %%ecx \n\t"
"add $7, %%ecx \n\t"
"shll %%cl , %%edx \n\t"
"addl %%edx, %%ebx \n\t"
"1: \n\t"
BRANCHLESS_GET_CABAC("%0", "%3", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
"test $1, %0 \n\t"
" jz 3f \n\t"
@ -750,62 +696,7 @@ static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *sign
"addl $4, %%eax \n\t"
"movl %%eax, %2 \n\t"
"movzbl 61(%1), %0 \n\t"
"movl %%esi, %%edx \n\t"
"andl $0xC0, %%esi \n\t"
"movzbl "MANGLE(ff_h264_lps_range)"(%0, %%esi, 2), %%esi\n\t"
/*eax:state ebx:low, edx:range, esi:RangeLPS*/
"subl %%esi, %%edx \n\t"
#if (defined CMOV_IS_FAST && __CPU__ >= 686)
"movl %%edx, %%ecx \n\t"
"shl $17, %%edx \n\t"
"cmpl %%ebx, %%edx \n\t"
"cmova %%ecx, %%esi \n\t"
"sbbl %%ecx, %%ecx \n\t"
"andl %%ecx, %%edx \n\t"
"subl %%edx, %%ebx \n\t"
"xorl %%ecx, %0 \n\t"
#else /* CMOV_IS_FAST */
"movl %%edx, %%ecx \n\t"
"shl $17, %%edx \n\t"
"subl %%ebx, %%edx \n\t"
"sarl $31, %%edx \n\t" //lps_mask
"subl %%ecx, %%esi \n\t" //RangeLPS - range
"andl %%edx, %%esi \n\t" //(RangeLPS - range)&lps_mask
"addl %%ecx, %%esi \n\t" //new range
"shl $17, %%ecx \n\t"
"andl %%edx, %%ecx \n\t"
"subl %%ecx, %%ebx \n\t"
"xorl %%edx, %0 \n\t"
#endif /* CMOV_IS_FAST */
"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
"shll %%cl, %%esi \n\t"
"movzbl "MANGLE(ff_h264_mlps_state)"+128(%0), %%edx \n\t"
"movb %%dl, 61(%1) \n\t"
"shll %%cl, %%ebx \n\t"
"test %%bx, %%bx \n\t"
" jnz 1f \n\t"
"movl "BYTE "(%3), %%ecx \n\t"
"movzwl (%%ecx), %%edx \n\t"
"bswap %%edx \n\t"
"shrl $15, %%edx \n\t"
"subl $0xFFFF, %%edx \n\t"
"addl $2, %%ecx \n\t"
"movl %%ecx, "BYTE "(%3) \n\t"
"leal -1(%%ebx), %%ecx \n\t"
"xorl %%ebx, %%ecx \n\t"
"shrl $15, %%ecx \n\t"
"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
"neg %%ecx \n\t"
"add $7, %%ecx \n\t"
"shll %%cl , %%edx \n\t"
"addl %%edx, %%ebx \n\t"
"1: \n\t"
BRANCHLESS_GET_CABAC("%0", "%3", "61(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
"test $1, %%eax \n\t"
" jnz 4f \n\t"

Write Preview
Loading…
Cancel
Save