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libavcodec/x86/h264_i386.h

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00001 /*
00002  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
00003  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
00004  *
00005  * This file is part of FFmpeg.
00006  *
00007  * FFmpeg is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * FFmpeg is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with FFmpeg; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00029 #ifndef AVCODEC_X86_H264_I386_H
00030 #define AVCODEC_X86_H264_I386_H
00031 
00032 #include "libavcodec/cabac.h"
00033 
00034 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
00035 //as that would make optimization work hard)
00036 #if ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE && !defined(BROKEN_RELOCATIONS)
00037 static int decode_significance_x86(CABACContext *c, int max_coeff,
00038                                    uint8_t *significant_coeff_ctx_base,
00039                                    int *index){
00040     void *end= significant_coeff_ctx_base + max_coeff - 1;
00041     int minusstart= -(int)significant_coeff_ctx_base;
00042     int minusindex= 4-(int)index;
00043     int coeff_count;
00044     __asm__ volatile(
00045         "movl "RANGE    "(%3), %%esi            \n\t"
00046         "movl "LOW      "(%3), %%ebx            \n\t"
00047 
00048         "2:                                     \n\t"
00049 
00050         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
00051                              "%%bx", "%%esi", "%%eax", "%%al")
00052 
00053         "test $1, %%edx                         \n\t"
00054         " jz 3f                                 \n\t"
00055 
00056         BRANCHLESS_GET_CABAC("%%edx", "%3", "61(%1)", "%%ebx",
00057                              "%%bx", "%%esi", "%%eax", "%%al")
00058 
00059         "mov  %2, %%"REG_a"                     \n\t"
00060         "movl %4, %%ecx                         \n\t"
00061         "add  %1, %%"REG_c"                     \n\t"
00062         "movl %%ecx, (%%"REG_a")                \n\t"
00063 
00064         "test $1, %%edx                         \n\t"
00065         " jnz 4f                                \n\t"
00066 
00067         "add  $4, %%"REG_a"                     \n\t"
00068         "mov  %%"REG_a", %2                     \n\t"
00069 
00070         "3:                                     \n\t"
00071         "add  $1, %1                            \n\t"
00072         "cmp  %5, %1                            \n\t"
00073         " jb 2b                                 \n\t"
00074         "mov  %2, %%"REG_a"                     \n\t"
00075         "movl %4, %%ecx                         \n\t"
00076         "add  %1, %%"REG_c"                     \n\t"
00077         "movl %%ecx, (%%"REG_a")                \n\t"
00078         "4:                                     \n\t"
00079         "add  %6, %%eax                         \n\t"
00080         "shr $2, %%eax                          \n\t"
00081 
00082         "movl %%esi, "RANGE    "(%3)            \n\t"
00083         "movl %%ebx, "LOW      "(%3)            \n\t"
00084         :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
00085         :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex)
00086         : "%"REG_c, "%ebx", "%edx", "%esi", "memory"
00087     );
00088     return coeff_count;
00089 }
00090 
00091 static int decode_significance_8x8_x86(CABACContext *c,
00092                                        uint8_t *significant_coeff_ctx_base,
00093                                        int *index, const uint8_t *sig_off){
00094     int minusindex= 4-(int)index;
00095     int coeff_count;
00096     x86_reg last=0;
00097     __asm__ volatile(
00098         "movl "RANGE    "(%3), %%esi            \n\t"
00099         "movl "LOW      "(%3), %%ebx            \n\t"
00100 
00101         "mov %1, %%"REG_D"                      \n\t"
00102         "2:                                     \n\t"
00103 
00104         "mov %6, %%"REG_a"                      \n\t"
00105         "movzbl (%%"REG_a", %%"REG_D"), %%edi   \n\t"
00106         "add %5, %%"REG_D"                      \n\t"
00107 
00108         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
00109                              "%%bx", "%%esi", "%%eax", "%%al")
00110 
00111         "mov %1, %%edi                          \n\t"
00112         "test $1, %%edx                         \n\t"
00113         " jz 3f                                 \n\t"
00114 
00115         "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
00116         "add %5, %%"REG_D"                      \n\t"
00117 
00118         BRANCHLESS_GET_CABAC("%%edx", "%3", "15(%%"REG_D")", "%%ebx",
00119                              "%%bx", "%%esi", "%%eax", "%%al")
00120 
00121         "mov %2, %%"REG_a"                      \n\t"
00122         "mov %1, %%edi                          \n\t"
00123         "movl %%edi, (%%"REG_a")                \n\t"
00124 
00125         "test $1, %%edx                         \n\t"
00126         " jnz 4f                                \n\t"
00127 
00128         "add $4, %%"REG_a"                      \n\t"
00129         "mov %%"REG_a", %2                      \n\t"
00130 
00131         "3:                                     \n\t"
00132         "addl $1, %%edi                         \n\t"
00133         "mov %%edi, %1                          \n\t"
00134         "cmpl $63, %%edi                        \n\t"
00135         " jb 2b                                 \n\t"
00136         "mov %2, %%"REG_a"                      \n\t"
00137         "movl %%edi, (%%"REG_a")                \n\t"
00138         "4:                                     \n\t"
00139         "addl %4, %%eax                         \n\t"
00140         "shr $2, %%eax                          \n\t"
00141 
00142         "movl %%esi, "RANGE    "(%3)            \n\t"
00143         "movl %%ebx, "LOW      "(%3)            \n\t"
00144         :"=&a"(coeff_count),"+m"(last), "+m"(index)
00145         :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off)
00146         : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
00147     );
00148     return coeff_count;
00149 }
00150 #endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */
00151        /* !defined(BROKEN_RELOCATIONS) */
00152 
00153 #endif /* AVCODEC_X86_H264_I386_H */

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