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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>
151 lines
5.9 KiB
C
151 lines
5.9 KiB
C
/*
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* H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
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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 FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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/**
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* @file
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* H.264 / AVC / MPEG4 part10 codec.
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* non-MMX i386-specific optimizations for H.264
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* @author Michael Niedermayer <michaelni@gmx.at>
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*/
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#ifndef AVCODEC_X86_H264_I386_H
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#define AVCODEC_X86_H264_I386_H
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#include <stddef.h>
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#include "libavcodec/cabac.h"
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#include "cabac.h"
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//FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
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//as that would make optimization work hard)
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#if HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
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static int decode_significance_x86(CABACContext *c, int max_coeff,
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uint8_t *significant_coeff_ctx_base,
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int *index, x86_reg last_off){
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void *end= significant_coeff_ctx_base + max_coeff - 1;
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int minusstart= -(intptr_t)significant_coeff_ctx_base;
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int minusindex= 4-(intptr_t)index;
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int bit;
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x86_reg coeff_count;
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__asm__ volatile(
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"2: \n\t"
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BRANCHLESS_GET_CABAC("%4", "%6", "(%1)", "%3",
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"%w3", "%5", "%k0", "%b0", "%a11")
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"test $1, %4 \n\t"
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" jz 3f \n\t"
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"add %10, %1 \n\t"
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BRANCHLESS_GET_CABAC("%4", "%6", "(%1)", "%3",
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"%w3", "%5", "%k0", "%b0", "%a11")
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"sub %10, %1 \n\t"
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"mov %2, %0 \n\t"
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"movl %7, %%ecx \n\t"
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"add %1, %%"REG_c" \n\t"
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"movl %%ecx, (%0) \n\t"
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"test $1, %4 \n\t"
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" jnz 4f \n\t"
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"add"OPSIZE" $4, %2 \n\t"
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"3: \n\t"
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"add $1, %1 \n\t"
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"cmp %8, %1 \n\t"
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" jb 2b \n\t"
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"mov %2, %0 \n\t"
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"movl %7, %%ecx \n\t"
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"add %1, %%"REG_c" \n\t"
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"movl %%ecx, (%0) \n\t"
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"4: \n\t"
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"add %9, %k0 \n\t"
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"shr $2, %k0 \n\t"
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:"=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
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"+&r"(c->low), "=&r"(bit), "+&r"(c->range)
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:"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
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"i"(offsetof(CABACContext, bytestream))
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: "%"REG_c, "memory"
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);
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return coeff_count;
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}
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static int decode_significance_8x8_x86(CABACContext *c,
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uint8_t *significant_coeff_ctx_base,
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int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
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int minusindex= 4-(intptr_t)index;
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int bit;
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x86_reg coeff_count;
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x86_reg last=0;
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x86_reg state;
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__asm__ volatile(
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"mov %1, %6 \n\t"
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"2: \n\t"
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"mov %10, %0 \n\t"
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"movzbl (%0, %6), %k6 \n\t"
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"add %9, %6 \n\t"
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BRANCHLESS_GET_CABAC("%4", "%7", "(%6)", "%3",
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"%w3", "%5", "%k0", "%b0", "%a12")
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"mov %1, %k6 \n\t"
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"test $1, %4 \n\t"
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" jz 3f \n\t"
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"movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%k6), %k6\n\t"
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"add %11, %6 \n\t"
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BRANCHLESS_GET_CABAC("%4", "%7", "(%6)", "%3",
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"%w3", "%5", "%k0", "%b0", "%a12")
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"mov %2, %0 \n\t"
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"mov %1, %k6 \n\t"
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"movl %k6, (%0) \n\t"
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"test $1, %4 \n\t"
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" jnz 4f \n\t"
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"add"OPSIZE" $4, %2 \n\t"
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"3: \n\t"
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"addl $1, %k6 \n\t"
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"mov %k6, %1 \n\t"
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"cmpl $63, %k6 \n\t"
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" jb 2b \n\t"
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"mov %2, %0 \n\t"
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"movl %k6, (%0) \n\t"
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"4: \n\t"
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"addl %8, %k0 \n\t"
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"shr $2, %k0 \n\t"
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:"=&q"(coeff_count),"+m"(last), "+m"(index), "+&r"(c->low), "=&r"(bit),
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"+&r"(c->range), "=&r"(state)
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:"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_coeff_ctx_base),
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"i"(offsetof(CABACContext, bytestream))
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: "%"REG_c, "memory"
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);
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return coeff_count;
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}
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#endif /* HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
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#endif /* AVCODEC_X86_H264_I386_H */
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