Libav 0.7.1
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 Libav.
00006  *
00007  * Libav 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  * Libav 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 Libav; 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, x86_reg last_off){
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         "add  %7, %1                            \n\t"
00056 
00057         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%1)", "%%ebx",
00058                              "%%bx", "%%esi", "%%eax", "%%al")
00059 
00060         "sub  %7, %1                            \n\t"
00061         "mov  %2, %%"REG_a"                     \n\t"
00062         "movl %4, %%ecx                         \n\t"
00063         "add  %1, %%"REG_c"                     \n\t"
00064         "movl %%ecx, (%%"REG_a")                \n\t"
00065 
00066         "test $1, %%edx                         \n\t"
00067         " jnz 4f                                \n\t"
00068 
00069         "add  $4, %%"REG_a"                     \n\t"
00070         "mov  %%"REG_a", %2                     \n\t"
00071 
00072         "3:                                     \n\t"
00073         "add  $1, %1                            \n\t"
00074         "cmp  %5, %1                            \n\t"
00075         " jb 2b                                 \n\t"
00076         "mov  %2, %%"REG_a"                     \n\t"
00077         "movl %4, %%ecx                         \n\t"
00078         "add  %1, %%"REG_c"                     \n\t"
00079         "movl %%ecx, (%%"REG_a")                \n\t"
00080         "4:                                     \n\t"
00081         "add  %6, %%eax                         \n\t"
00082         "shr $2, %%eax                          \n\t"
00083 
00084         "movl %%esi, "RANGE    "(%3)            \n\t"
00085         "movl %%ebx, "LOW      "(%3)            \n\t"
00086         :"=&a"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index)
00087         :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off)
00088         : "%"REG_c, "%ebx", "%edx", "%esi", "memory"
00089     );
00090     return coeff_count;
00091 }
00092 
00093 static int decode_significance_8x8_x86(CABACContext *c,
00094                                        uint8_t *significant_coeff_ctx_base,
00095                                        int *index, x86_reg last_off, const uint8_t *sig_off){
00096     int minusindex= 4-(int)index;
00097     int coeff_count;
00098     x86_reg last=0;
00099     __asm__ volatile(
00100         "movl "RANGE    "(%3), %%esi            \n\t"
00101         "movl "LOW      "(%3), %%ebx            \n\t"
00102 
00103         "mov %1, %%"REG_D"                      \n\t"
00104         "2:                                     \n\t"
00105 
00106         "mov %6, %%"REG_a"                      \n\t"
00107         "movzbl (%%"REG_a", %%"REG_D"), %%edi   \n\t"
00108         "add %5, %%"REG_D"                      \n\t"
00109 
00110         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
00111                              "%%bx", "%%esi", "%%eax", "%%al")
00112 
00113         "mov %1, %%edi                          \n\t"
00114         "test $1, %%edx                         \n\t"
00115         " jz 3f                                 \n\t"
00116 
00117         "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%%edi), %%edi\n\t"
00118         "add %5, %%"REG_D"                      \n\t"
00119         "add %7, %%"REG_D"                      \n\t"
00120 
00121         BRANCHLESS_GET_CABAC("%%edx", "%3", "(%%"REG_D")", "%%ebx",
00122                              "%%bx", "%%esi", "%%eax", "%%al")
00123 
00124         "mov %2, %%"REG_a"                      \n\t"
00125         "mov %1, %%edi                          \n\t"
00126         "movl %%edi, (%%"REG_a")                \n\t"
00127 
00128         "test $1, %%edx                         \n\t"
00129         " jnz 4f                                \n\t"
00130 
00131         "add $4, %%"REG_a"                      \n\t"
00132         "mov %%"REG_a", %2                      \n\t"
00133 
00134         "3:                                     \n\t"
00135         "addl $1, %%edi                         \n\t"
00136         "mov %%edi, %1                          \n\t"
00137         "cmpl $63, %%edi                        \n\t"
00138         " jb 2b                                 \n\t"
00139         "mov %2, %%"REG_a"                      \n\t"
00140         "movl %%edi, (%%"REG_a")                \n\t"
00141         "4:                                     \n\t"
00142         "addl %4, %%eax                         \n\t"
00143         "shr $2, %%eax                          \n\t"
00144 
00145         "movl %%esi, "RANGE    "(%3)            \n\t"
00146         "movl %%ebx, "LOW      "(%3)            \n\t"
00147         :"=&a"(coeff_count),"+m"(last), "+m"(index)
00148         :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off)
00149         : "%"REG_c, "%ebx", "%edx", "%esi", "%"REG_D, "memory"
00150     );
00151     return coeff_count;
00152 }
00153 #endif /* ARCH_X86 && HAVE_7REGS && HAVE_EBX_AVAILABLE */
00154        /* !defined(BROKEN_RELOCATIONS) */
00155 
00156 #endif /* AVCODEC_X86_H264_I386_H */