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138 lines
6.5 KiB
138 lines
6.5 KiB
/* |
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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, 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, 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, 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, statep, low, lowword, 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" , %%"REG_c" \n\t"\ |
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"add"OPSIZE" $2 , "byte" \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 HAVE_6REGS && !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)", "%1", "%w1", "%2", |
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"%3", "%b3", "%4") |
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:"=&r"(bit), "+&r"(c->low), "+&r"(c->range), "=&q"(tmp), |
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"+m"(c->bytestream) |
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:"r"(state) |
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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 /* HAVE_6REGS && !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 %4, %k1 \n\t" |
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"movl %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 %3, %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, %3 \n\t" |
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"1: \n\t" |
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"movl %%eax, %2 \n\t" |
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:"+c"(val), "=&r"(tmp), "+m"(c->low), "+m"(c->bytestream) |
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:"m"(c->range) |
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: "%eax", "%edx" |
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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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