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https://gitee.com/openharmony/third_party_ffmpeg
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factorize get_cabac asm (0.5% slower but its much cleaner)
Originally committed as revision 6740 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer
parent
1e4051aaa0
commit
13404b2e98
@ -452,71 +452,72 @@ static int always_inline get_cabac_inline(CABACContext *c, uint8_t * const state
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);
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bit&=1;
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#else /* BRANCHLESS_CABAC_DECODER */
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asm volatile(
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"movzbl (%1), %0 \n\t"
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"movl "RANGE "(%2), %%ebx \n\t"
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"movl "RANGE "(%2), %%edx \n\t"
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"andl $0xC0, %%ebx \n\t"
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"movzbl "MANGLE(ff_h264_lps_range)"(%0, %%ebx, 2), %%esi\n\t"
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"movl "LOW "(%2), %%ebx \n\t"
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//eax:state ebx:low, edx:range, esi:RangeLPS
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"subl %%esi, %%edx \n\t"
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#if (defined CMOV_IS_FAST && __CPU__ >= 686)
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"movl %%edx, %%ecx \n\t"
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"shl $17, %%edx \n\t"
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"cmpl %%ebx, %%edx \n\t"
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"cmova %%ecx, %%esi \n\t"
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"sbbl %%ecx, %%ecx \n\t"
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"andl %%ecx, %%edx \n\t"
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"subl %%edx, %%ebx \n\t"
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"xorl %%ecx, %0 \n\t"
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#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
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"mov "tmp" , %%ecx \n\t"\
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"shl $17 , "tmp" \n\t"\
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"cmp "low" , "tmp" \n\t"\
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"cmova %%ecx , "range" \n\t"\
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"sbb %%ecx , %%ecx \n\t"\
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"and %%ecx , "tmp" \n\t"\
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"sub "tmp" , "low" \n\t"\
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"xor %%ecx , "ret" \n\t"
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#else /* CMOV_IS_FAST */
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"movl %%edx, %%ecx \n\t"
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"shl $17, %%edx \n\t"
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"subl %%ebx, %%edx \n\t"
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"sarl $31, %%edx \n\t" //lps_mask
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"subl %%ecx, %%esi \n\t" //RangeLPS - range
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"andl %%edx, %%esi \n\t" //(RangeLPS - range)&lps_mask
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"addl %%ecx, %%esi \n\t" //new range
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"shl $17, %%ecx \n\t"
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"andl %%edx, %%ecx \n\t"
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"subl %%ecx, %%ebx \n\t"
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"xorl %%edx, %0 \n\t"
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#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
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"mov "tmp" , %%ecx \n\t"\
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"shl $17 , "tmp" \n\t"\
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"sub "low" , "tmp" \n\t"\
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"sar $31 , "tmp" \n\t" /*lps_mask*/\
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"sub %%ecx , "range" \n\t" /*RangeLPS - range*/\
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"and "tmp" , "range" \n\t" /*(RangeLPS - range)&lps_mask*/\
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"add %%ecx , "range" \n\t" /*new range*/\
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"shl $17 , %%ecx \n\t"\
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"and "tmp" , %%ecx \n\t"\
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"sub %%ecx , "low" \n\t"\
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"xor "tmp" , "ret" \n\t"
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#endif /* CMOV_IS_FAST */
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//eax:state ebx:low edx:mask esi:range
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//eax:bit ebx:low esi:range
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#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
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"movzbl "statep" , "ret" \n\t"\
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"mov "range" , "tmp" \n\t"\
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"and $0xC0 , "range" \n\t"\
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"movzbl "MANGLE(ff_h264_lps_range)"("ret", "range", 2), "range" \n\t"\
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"sub "range" , "tmp" \n\t"\
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BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp, tmpbyte)\
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"movzbl " MANGLE(ff_h264_norm_shift) "("range"), %%ecx \n\t"\
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"shl %%cl , "range" \n\t"\
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"movzbl "MANGLE(ff_h264_mlps_state)"+128("ret"), "tmp" \n\t"\
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"mov "tmpbyte" , "statep" \n\t"\
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"shl %%cl , "low" \n\t"\
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"test "lowword" , "lowword" \n\t"\
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" jnz 1f \n\t"\
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"mov "BYTE"("cabac"), %%ecx \n\t"\
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"movzwl (%%ecx) , "tmp" \n\t"\
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"bswap "tmp" \n\t"\
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"shr $15 , "tmp" \n\t"\
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"sub $0xFFFF , "tmp" \n\t"\
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"add $2 , %%ecx \n\t"\
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"mov %%ecx , "BYTE "("cabac") \n\t"\
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"lea -1("low") , %%ecx \n\t"\
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"xor "low" , %%ecx \n\t"\
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"shr $15 , %%ecx \n\t"\
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\
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"neg %%ecx \n\t"\
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"add $7 , %%ecx \n\t"\
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"shl %%cl , "tmp" \n\t"\
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"add "tmp" , "low" \n\t"\
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"1: \n\t"
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
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"shll %%cl, %%esi \n\t"
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"movzbl "MANGLE(ff_h264_mlps_state)"+128(%0), %%edx \n\t"
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"movb %%dl, (%1) \n\t"
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asm volatile(
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"movl "RANGE "(%2), %%esi \n\t"
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"movl "LOW "(%2), %%ebx \n\t"
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BRANCHLESS_GET_CABAC("%0", "%2", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
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"movl %%esi, "RANGE "(%2) \n\t"
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"shll %%cl, %%ebx \n\t"
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"movl %%ebx, "LOW "(%2) \n\t"
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"test %%bx, %%bx \n\t"
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" jnz 1f \n\t"
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"movl "BYTE "(%2), %%ecx \n\t"
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"movzwl (%%ecx), %%esi \n\t"
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"bswap %%esi \n\t"
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"shrl $15, %%esi \n\t"
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"subl $0xFFFF, %%esi \n\t"
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"addl $2, %%ecx \n\t"
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"movl %%ecx, "BYTE "(%2) \n\t"
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"leal -1(%%ebx), %%ecx \n\t"
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"xorl %%ebx, %%ecx \n\t"
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"shrl $15, %%ecx \n\t"
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
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"neg %%ecx \n\t"
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"add $7, %%ecx \n\t"
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"shll %%cl , %%esi \n\t"
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"addl %%esi, %%ebx \n\t"
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"movl %%ebx, "LOW "(%2) \n\t"
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"1: \n\t"
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:"=&a"(bit)
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:"r"(state), "r"(c)
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: "%ecx", "%ebx", "%edx", "%esi", "memory"
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@ -683,62 +684,7 @@ static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *sign
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"2: \n\t"
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"movzbl (%1), %0 \n\t"
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"movl %%esi, %%edx \n\t"
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"andl $0xC0, %%esi \n\t"
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"movzbl "MANGLE(ff_h264_lps_range)"(%0, %%esi, 2), %%esi\n\t"
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/*eax:state ebx:low, edx:range, esi:RangeLPS*/
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"subl %%esi, %%edx \n\t"
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#if (defined CMOV_IS_FAST && __CPU__ >= 686)
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"movl %%edx, %%ecx \n\t"
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"shl $17, %%edx \n\t"
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"cmpl %%ebx, %%edx \n\t"
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"cmova %%ecx, %%esi \n\t"
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"sbbl %%ecx, %%ecx \n\t"
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"andl %%ecx, %%edx \n\t"
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"subl %%edx, %%ebx \n\t"
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"xorl %%ecx, %0 \n\t"
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#else /* CMOV_IS_FAST */
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"movl %%edx, %%ecx \n\t"
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"shl $17, %%edx \n\t"
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"subl %%ebx, %%edx \n\t"
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"sarl $31, %%edx \n\t" //lps_mask
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"subl %%ecx, %%esi \n\t" //RangeLPS - range
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"andl %%edx, %%esi \n\t" //(RangeLPS - range)&lps_mask
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"addl %%ecx, %%esi \n\t" //new range
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"shl $17, %%ecx \n\t"
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"andl %%edx, %%ecx \n\t"
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"subl %%ecx, %%ebx \n\t"
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"xorl %%edx, %0 \n\t"
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#endif /* CMOV_IS_FAST */
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
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"shll %%cl, %%esi \n\t"
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"movzbl "MANGLE(ff_h264_mlps_state)"+128(%0), %%edx \n\t"
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"movb %%dl, (%1) \n\t"
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"shll %%cl, %%ebx \n\t"
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"test %%bx, %%bx \n\t"
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" jnz 1f \n\t"
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"movl "BYTE "(%3), %%ecx \n\t"
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"movzwl (%%ecx), %%edx \n\t"
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"bswap %%edx \n\t"
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"shrl $15, %%edx \n\t"
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"subl $0xFFFF, %%edx \n\t"
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"addl $2, %%ecx \n\t"
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"movl %%ecx, "BYTE "(%3) \n\t"
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"leal -1(%%ebx), %%ecx \n\t"
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"xorl %%ebx, %%ecx \n\t"
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"shrl $15, %%ecx \n\t"
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
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"neg %%ecx \n\t"
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"add $7, %%ecx \n\t"
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"shll %%cl , %%edx \n\t"
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"addl %%edx, %%ebx \n\t"
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"1: \n\t"
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BRANCHLESS_GET_CABAC("%0", "%3", "(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
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"test $1, %0 \n\t"
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" jz 3f \n\t"
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@ -750,62 +696,7 @@ static int decode_significance_x86(CABACContext *c, int max_coeff, uint8_t *sign
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"addl $4, %%eax \n\t"
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"movl %%eax, %2 \n\t"
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"movzbl 61(%1), %0 \n\t"
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"movl %%esi, %%edx \n\t"
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"andl $0xC0, %%esi \n\t"
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"movzbl "MANGLE(ff_h264_lps_range)"(%0, %%esi, 2), %%esi\n\t"
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/*eax:state ebx:low, edx:range, esi:RangeLPS*/
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"subl %%esi, %%edx \n\t"
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#if (defined CMOV_IS_FAST && __CPU__ >= 686)
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"movl %%edx, %%ecx \n\t"
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"shl $17, %%edx \n\t"
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"cmpl %%ebx, %%edx \n\t"
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"cmova %%ecx, %%esi \n\t"
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"sbbl %%ecx, %%ecx \n\t"
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"andl %%ecx, %%edx \n\t"
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"subl %%edx, %%ebx \n\t"
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"xorl %%ecx, %0 \n\t"
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#else /* CMOV_IS_FAST */
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"movl %%edx, %%ecx \n\t"
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"shl $17, %%edx \n\t"
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"subl %%ebx, %%edx \n\t"
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"sarl $31, %%edx \n\t" //lps_mask
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"subl %%ecx, %%esi \n\t" //RangeLPS - range
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"andl %%edx, %%esi \n\t" //(RangeLPS - range)&lps_mask
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"addl %%ecx, %%esi \n\t" //new range
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"shl $17, %%ecx \n\t"
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"andl %%edx, %%ecx \n\t"
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"subl %%ecx, %%ebx \n\t"
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"xorl %%edx, %0 \n\t"
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#endif /* CMOV_IS_FAST */
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%esi), %%ecx \n\t"
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"shll %%cl, %%esi \n\t"
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"movzbl "MANGLE(ff_h264_mlps_state)"+128(%0), %%edx \n\t"
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"movb %%dl, 61(%1) \n\t"
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"shll %%cl, %%ebx \n\t"
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"test %%bx, %%bx \n\t"
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" jnz 1f \n\t"
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"movl "BYTE "(%3), %%ecx \n\t"
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"movzwl (%%ecx), %%edx \n\t"
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"bswap %%edx \n\t"
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"shrl $15, %%edx \n\t"
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"subl $0xFFFF, %%edx \n\t"
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"addl $2, %%ecx \n\t"
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"movl %%ecx, "BYTE "(%3) \n\t"
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"leal -1(%%ebx), %%ecx \n\t"
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"xorl %%ebx, %%ecx \n\t"
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"shrl $15, %%ecx \n\t"
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"
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"neg %%ecx \n\t"
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"add $7, %%ecx \n\t"
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"shll %%cl , %%edx \n\t"
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"addl %%edx, %%ebx \n\t"
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"1: \n\t"
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BRANCHLESS_GET_CABAC("%0", "%3", "61(%1)", "%%ebx", "%%bx", "%%esi", "%%edx", "%%dl")
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"test $1, %%eax \n\t"
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" jnz 4f \n\t"
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