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c4f237a981
Author: Mans Rullgard <mans@mansr.com>
Date: Sun Dec 11 21:41:59 2011 +0000
x86: cabac: replace explicit memory references with "m" operands
This replaces the explicit offset(reg) memory references with
"m" operands for the same locations. As a result, one fewer
register operand is needed for these inline asm statements.
This change appears to have broken compilation on darwin, and subsequent
fixes by martin (which did not fix compilation) removed the register
advantage, thus this change seems not a good idea to keep.
See: http://fate.ffmpeg.org/log.cgi?time=20120103122446&log=compile&slot=i386-darwin-llvm-gcc-4.2.1
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
148 lines
7.0 KiB
C
148 lines
7.0 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 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, low, range, tmp;
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__asm__ volatile(
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"movl %a6(%5), %2 \n\t"
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"movl %a7(%5), %1 \n\t"
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BRANCHLESS_GET_CABAC("%0", "%5", "(%4)", "%1", "%w1", "%2",
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"%3", "%b3", "%a8")
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"movl %2, %a6(%5) \n\t"
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"movl %1, %a7(%5) \n\t"
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:"=&r"(bit), "=&r"(low), "=&r"(range), "=&q"(tmp)
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:"r"(state), "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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: "%"REG_c, "memory"
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);
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return bit & 1;
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}
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#endif /* 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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