mirror of
https://github.com/FFmpeg/FFmpeg.git
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142 lines
6.7 KiB
C
142 lines
6.7 KiB
C
/*
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_X86_CABAC_H
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#define AVCODEC_X86_CABAC_H
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#include "libavcodec/cabac.h"
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#include "libavutil/attributes.h"
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#include "libavutil/x86_cpu.h"
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#include "config.h"
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#if HAVE_FAST_CMOV
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#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\
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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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"xor %%ecx , "ret" \n\t"\
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"sub "tmp" , "low" \n\t"
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#else /* HAVE_FAST_CMOV */
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#define BRANCHLESS_GET_CABAC_UPDATE(ret, cabac, statep, low, lowword, range, tmp)\
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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 /* HAVE_FAST_CMOV */
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#define BRANCHLESS_GET_CABAC(ret, cabac, statep, low, lowword, range, tmp, tmpbyte, byte) \
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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, \
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range, tmp) \
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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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"shl %%cl , "low" \n\t"\
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"mov "tmpbyte" , "statep" \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"), %%"REG_c" \n\t"\
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"add"OPSIZE" $2 , "byte "("cabac") \n\t"\
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"movzwl (%%"REG_c") , "tmp" \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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"bswap "tmp" \n\t"\
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"shr $15 , "tmp" \n\t"\
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"movzbl " MANGLE(ff_h264_norm_shift) "(%%ecx), %%ecx \n\t"\
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"sub $0xFFFF , "tmp" \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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#if ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
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#define get_cabac_inline get_cabac_inline_x86
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static av_always_inline int get_cabac_inline_x86(CABACContext *c,
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uint8_t *const state)
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{
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int bit, tmp;
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__asm__ volatile(
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BRANCHLESS_GET_CABAC("%0", "%5", "(%4)", "%1", "%w1", "%2",
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"%3", "%b3", "%a6")
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:"=&r"(bit), "+&r"(c->low), "+&r"(c->range), "=&q"(tmp)
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:"r"(state), "r"(c),
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"i"(offsetof(CABACContext, bytestream))
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: "%"REG_c, "memory"
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);
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return bit & 1;
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}
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#endif /* ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
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#define get_cabac_bypass_sign get_cabac_bypass_sign_x86
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static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val)
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{
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x86_reg tmp;
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__asm__ volatile(
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"movl %a3(%2), %k1 \n\t"
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"movl %a4(%2), %%eax \n\t"
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"shl $17, %k1 \n\t"
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"add %%eax, %%eax \n\t"
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"sub %k1, %%eax \n\t"
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"cltd \n\t"
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"and %%edx, %k1 \n\t"
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"add %k1, %%eax \n\t"
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"xor %%edx, %%ecx \n\t"
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"sub %%edx, %%ecx \n\t"
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"test %%ax, %%ax \n\t"
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" jnz 1f \n\t"
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"mov %a5(%2), %1 \n\t"
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"subl $0xFFFF, %%eax \n\t"
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"movzwl (%1), %%edx \n\t"
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"bswap %%edx \n\t"
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"shrl $15, %%edx \n\t"
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"add $2, %1 \n\t"
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"addl %%edx, %%eax \n\t"
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"mov %1, %a5(%2) \n\t"
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"1: \n\t"
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"movl %%eax, %a4(%2) \n\t"
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:"+c"(val), "=&r"(tmp)
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:"r"(c),
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"i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
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"i"(offsetof(CABACContext, bytestream))
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: "%eax", "%edx", "memory"
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);
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return val;
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}
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#endif /* AVCODEC_X86_CABAC_H */
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