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   1 /*
   2  * H.26L/H.264/AVC/JVT/14496-10/... encoder/decoder
   3  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 /**
  23  * @file
  24  * H.264 / AVC / MPEG4 part10 codec.
  25  * non-MMX i386-specific optimizations for H.264
  26  * @author Michael Niedermayer <michaelni@gmx.at>
  27  */
  28
  29 #ifndef AVCODEC_X86_H264_I386_H
  30 #define AVCODEC_X86_H264_I386_H
  31
  32 #include <stddef.h>
  33
  34 #include "libavcodec/cabac.h"
  35 #include "cabac.h"
  36
  37 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
  38 //as that would make optimization work hard)
  39 #if ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS)
  40 static int decode_significance_x86(CABACContext *c, int max_coeff,
  41                                    uint8_t *significant_coeff_ctx_base,
  42                                    int *index, x86_reg last_off){
  43     void *end= significant_coeff_ctx_base + max_coeff - 1;
  44     int minusstart= -(intptr_t)significant_coeff_ctx_base;
  45     int minusindex= 4-(intptr_t)index;
  46     int bit;
  47     x86_reg coeff_count;
  48     int low;
  49     int range;
  50     __asm__ volatile(
  51         "movl %a11(%6), %5                      \n\t"
  52         "movl %a12(%6), %3                      \n\t"
  53
  54         "2:                                     \n\t"
  55
  56         BRANCHLESS_GET_CABAC("%4", "%6", "(%1)", "%3",
  57                              "%w3", "%5", "%k0", "%b0", "%a13")
  58
  59         "test $1, %4                            \n\t"
  60         " jz 3f                                 \n\t"
  61         "add  %10, %1                           \n\t"
  62
  63         BRANCHLESS_GET_CABAC("%4", "%6", "(%1)", "%3",
  64                              "%w3", "%5", "%k0", "%b0", "%a13")
  65
  66         "sub  %10, %1                           \n\t"
  67         "mov  %2, %0                            \n\t"
  68         "movl %7, %%ecx                         \n\t"
  69         "add  %1, %%"REG_c"                     \n\t"
  70         "movl %%ecx, (%0)                       \n\t"
  71
  72         "test $1, %4                            \n\t"
  73         " jnz 4f                                \n\t"
  74
  75         "add  $4, %0                            \n\t"
  76         "mov  %0, %2                            \n\t"
  77
  78         "3:                                     \n\t"
  79         "add  $1, %1                            \n\t"
  80         "cmp  %8, %1                            \n\t"
  81         " jb 2b                                 \n\t"
  82         "mov  %2, %0                            \n\t"
  83         "movl %7, %%ecx                         \n\t"
  84         "add  %1, %%"REG_c"                     \n\t"
  85         "movl %%ecx, (%0)                       \n\t"
  86         "4:                                     \n\t"
  87         "add  %9, %k0                           \n\t"
  88         "shr $2, %k0                            \n\t"
  89
  90         "movl %5, %a11(%6)                      \n\t"
  91         "movl %3, %a12(%6)                      \n\t"
  92         :"=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
  93          "=&r"(low), "=&r"(bit), "=&r"(range)
  94         :"r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
  95          "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
  96          "i"(offsetof(CABACContext, bytestream))
  97         : "%"REG_c, "memory"
  98     );
  99     return coeff_count;
 100 }
 101
 102 static int decode_significance_8x8_x86(CABACContext *c,
 103                                        uint8_t *significant_coeff_ctx_base,
 104                                        int *index, x86_reg last_off, const uint8_t *sig_off){
 105     int minusindex= 4-(intptr_t)index;
 106     int bit;
 107     x86_reg coeff_count;
 108     int low;
 109     int range;
 110     x86_reg last=0;
 111     x86_reg state;
 112     __asm__ volatile(
 113         "movl %a12(%7), %5                      \n\t"
 114         "movl %a13(%7), %3                      \n\t"
 115
 116         "mov %1, %6                             \n\t"
 117         "2:                                     \n\t"
 118
 119         "mov %10, %0                            \n\t"
 120         "movzbl (%0, %6), %k6                   \n\t"
 121         "add %9, %6                             \n\t"
 122
 123         BRANCHLESS_GET_CABAC("%4", "%7", "(%6)", "%3",
 124                              "%w3", "%5", "%k0", "%b0", "%a14")
 125
 126         "mov %1, %k6                            \n\t"
 127         "test $1, %4                            \n\t"
 128         " jz 3f                                 \n\t"
 129
 130         "movzbl "MANGLE(last_coeff_flag_offset_8x8)"(%k6), %k6\n\t"
 131         "add %9, %6                             \n\t"
 132         "add %11, %6                            \n\t"
 133
 134         BRANCHLESS_GET_CABAC("%4", "%7", "(%6)", "%3",
 135                              "%w3", "%5", "%k0", "%b0", "%a14")
 136
 137         "mov %2, %0                             \n\t"
 138         "mov %1, %k6                            \n\t"
 139         "movl %k6, (%0)                         \n\t"
 140
 141         "test $1, %4                            \n\t"
 142         " jnz 4f                                \n\t"
 143
 144         "add $4, %0                             \n\t"
 145         "mov %0, %2                             \n\t"
 146
 147         "3:                                     \n\t"
 148         "addl $1, %k6                           \n\t"
 149         "mov %k6, %1                            \n\t"
 150         "cmpl $63, %k6                          \n\t"
 151         " jb 2b                                 \n\t"
 152         "mov %2, %0                             \n\t"
 153         "movl %k6, (%0)                         \n\t"
 154         "4:                                     \n\t"
 155         "addl %8, %k0                           \n\t"
 156         "shr $2, %k0                            \n\t"
 157
 158         "movl %5, %a12(%7)                      \n\t"
 159         "movl %3, %a13(%7)                      \n\t"
 160         :"=&q"(coeff_count),"+m"(last), "+m"(index), "=&r"(low), "=&r"(bit),
 161          "=&r"(range), "=&r"(state)
 162         :"r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base), "m"(sig_off), "m"(last_off),
 163          "i"(offsetof(CABACContext, range)), "i"(offsetof(CABACContext, low)),
 164          "i"(offsetof(CABACContext, bytestream))
 165         : "%"REG_c, "memory"
 166     );
 167     return coeff_count;
 168 }
 169 #endif /* ARCH_X86 && HAVE_7REGS && !defined(BROKEN_RELOCATIONS) */
 170
 171 #endif /* AVCODEC_X86_H264_I386_H */