diff options
author | Michael Niedermayer <michaelni@gmx.at> | 2006-10-20 00:35:54 +0000 |
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committer | Michael Niedermayer <michaelni@gmx.at> | 2006-10-20 00:35:54 +0000 |
commit | 13404b2e9813a70654ab26c661da501d91a8d2f9 (patch) | |
tree | 7ef034cb3097bedcc02e05e618717fc32aac75c1 /libavcodec/cabac.h | |
parent | 1e4051aaa041ca83ddfe09973558c2e9d2f32ec0 (diff) | |
download | ffmpeg-13404b2e9813a70654ab26c661da501d91a8d2f9.tar.gz |
factorize get_cabac asm (0.5% slower but its much cleaner)
Originally committed as revision 6740 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/cabac.h')
-rw-r--r-- | libavcodec/cabac.h | 227 |
1 files changed, 59 insertions, 168 deletions
diff --git a/libavcodec/cabac.h b/libavcodec/cabac.h index 826e281ca6..9bea58bbe0 100644 --- a/libavcodec/cabac.h +++ b/libavcodec/cabac.h @@ -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" |