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ffmpeg / libavcodec / x86 / h264_i386.h @ 2912e87a

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/*
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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 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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/**
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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 "libavcodec/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 ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !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){
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    void *end= significant_coeff_ctx_base + max_coeff - 1;
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    int minusstart= -(int)significant_coeff_ctx_base;
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    int minusindex= 4-(int)index;
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    int coeff_count;
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    __asm__ volatile(
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        "movl "RANGE    "(%3), %%esi            \n\t"
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        "movl "LOW      "(%3), %%ebx            \n\t"
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        "2:                                     \n\t"
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        BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
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                             "%%bx", "%%esi", "%%eax", "%%al")
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        "test $1, %%edx                         \n\t"
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        " jz 3f                                 \n\t"
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        BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx",
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                             "%%bx", "%%esi", "%%eax", "%%al")
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        "mov  %2, %%"REG_a"                     \n\t"
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        "movl %4, %%ecx                         \n\t"
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        "add  %1, %%"REG_c"                     \n\t"
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        "movl %%ecx, (%%"REG_a")                \n\t"
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        "test $1, %%edx                         \n\t"
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        " jnz 4f                                \n\t"
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        "add  $4, %%"REG_a"                     \n\t"
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        "mov  %%"REG_a", %2                     \n\t"
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        "3:                                     \n\t"
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        "add  $1, %1                            \n\t"
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        "cmp  %5, %1                            \n\t"
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        " jb 2b                                 \n\t"
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        "mov  %2, %%"REG_a"                     \n\t"
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        "movl %4, %%ecx                         \n\t"
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        "add  %1, %%"REG_c"                     \n\t"
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        "movl %%ecx, (%%"REG_a")                \n\t"
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        "4:                                     \n\t"
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        "add  %6, %%eax                         \n\t"
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        "shr $2, %%eax                          \n\t"
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        "movl %%esi, "RANGE    "(%3)            \n\t"
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        "movl %%ebx, "LOW      "(%3)            \n\t"
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        :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
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        :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)
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        : "%"REG_c, "%ebx", "%edx", "%esi", "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, const uint8_t *sig_off){
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    int minusindex= 4-(int)index;
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    int coeff_count;
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    x86_reg last=0;
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    __asm__ volatile(
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        "movl "RANGE    "(%3), %%esi            \n\t"
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        "movl "LOW      "(%3), %%ebx            \n\t"
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        "mov %1, %%"REG_D"                      \n\t"
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        "2:                                     \n\t"
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        "mov %6, %%"REG_a"                      \n\t"
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        "movzbl (%%"REG_a", %%"REG_D"), %%edi   \n\t"
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        "add %5, %%"REG_D"                      \n\t"
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        BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
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                             "%%bx", "%%esi", "%%eax", "%%al")
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        "mov %1, %%edi                          \n\t"
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        "test $1, %%edx                         \n\t"
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        " jz 3f                                 \n\t"
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        "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
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        "add %5, %%"REG_D"                      \n\t"
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        BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx",
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                             "%%bx", "%%esi", "%%eax", "%%al")
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        "mov %2, %%"REG_a"                      \n\t"
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        "mov %1, %%edi                          \n\t"
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        "movl %%edi, (%%"REG_a")                \n\t"
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        "test $1, %%edx                         \n\t"
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        " jnz 4f                                \n\t"
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        "add $4, %%"REG_a"                      \n\t"
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        "mov %%"REG_a", %2                      \n\t"
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        "3:                                     \n\t"
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        "addl $1, %%edi                         \n\t"
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        "mov %%edi, %1                          \n\t"
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        "cmpl $63, %%edi                        \n\t"
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        " jb 2b                                 \n\t"
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        "mov %2, %%"REG_a"                      \n\t"
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        "movl %%edi, (%%"REG_a")                \n\t"
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        "4:                                     \n\t"
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        "addl %4, %%eax                         \n\t"
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        "shr $2, %%eax                          \n\t"
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        "movl %%esi, "RANGE    "(%3)            \n\t"
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        "movl %%ebx, "LOW      "(%3)            \n\t"
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        :"=&a"(coeff_count),"+m"(last), "+m"(index)
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        :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)
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        : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
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    );
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    return coeff_count;
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}
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#endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */
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       /* !defined(BROKEN_RELOCATIONS) */
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#endif /* AVCODEC_X86_H264_I386_H */