ffmpeg/libavcodec/x86/h264_i386.h

   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 #if HAVE_INLINE_ASM
  38
  39 #if ARCH_X86_64
  40 #define REG64 "r"
  41 #else
  42 #define REG64 "m"
  43 #endif
  44
  45 //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
  46 //as that would make optimization work hard)
  47 #if HAVE_7REGS && !BROKEN_COMPILER
  48 #define decode_significance decode_significance_x86
  49 static int decode_significance_x86(CABACContext *c, int max_coeff,
  50                                    uint8_t *significant_coeff_ctx_base,
  51                                    int *index, x86_reg last_off){
  52     void *end= significant_coeff_ctx_base + max_coeff - 1;
  53     int minusstart= -(intptr_t)significant_coeff_ctx_base;
  54     int minusindex= 4-(intptr_t)index;
  55     int bit;
  56     x86_reg coeff_count;
  57
  58 #ifdef BROKEN_RELOCATIONS
  59     void *tables;
  60
  61     __asm__ volatile(
  62         "lea   "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
  63         : "=&r"(tables)
  64         : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables)
  65     );
  66 #endif
  67
  68     __asm__ volatile(
  69         "3:                                     \n\t"
  70
  71         BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
  72                              "%5", "%q5", "%k0", "%b0",
  73                              "%c11(%6)", "%c12(%6)",
  74                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
  75                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
  76                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
  77                              "%13")
  78
  79         "test $1, %4                            \n\t"
  80         " jz 4f                                 \n\t"
  81         "add  %10, %1                           \n\t"
  82
  83         BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
  84                              "%5", "%q5", "%k0", "%b0",
  85                              "%c11(%6)", "%c12(%6)",
  86                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
  87                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
  88                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
  89                              "%13")
  90
  91         "sub  %10, %1                           \n\t"
  92         "mov  %2, %0                            \n\t"
  93         "movl %7, %%ecx                         \n\t"
  94         "add  %1, %%"REG_c"                     \n\t"
  95         "movl %%ecx, (%0)                       \n\t"
  96
  97         "test $1, %4                            \n\t"
  98         " jnz 5f                                \n\t"
  99
 100         "add"OPSIZE"  $4, %2                    \n\t"
 101
 102         "4:                                     \n\t"
 103         "add  $1, %1                            \n\t"
 104         "cmp  %8, %1                            \n\t"
 105         " jb 3b                                 \n\t"
 106         "mov  %2, %0                            \n\t"
 107         "movl %7, %%ecx                         \n\t"
 108         "add  %1, %%"REG_c"                     \n\t"
 109         "movl %%ecx, (%0)                       \n\t"
 110         "5:                                     \n\t"
 111         "add  %9, %k0                           \n\t"
 112         "shr $2, %k0                            \n\t"
 113         : "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
 114           "+&r"(c->low), "=&r"(bit), "+&r"(c->range)
 115         : "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
 116           "i"(offsetof(CABACContext, bytestream)),
 117           "i"(offsetof(CABACContext, bytestream_end))
 118           TABLES_ARG
 119         : "%"REG_c, "memory"
 120     );
 121     return coeff_count;
 122 }
 123
 124 #define decode_significance_8x8 decode_significance_8x8_x86
 125 static int decode_significance_8x8_x86(CABACContext *c,
 126                                        uint8_t *significant_coeff_ctx_base,
 127                                        int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
 128     int minusindex= 4-(intptr_t)index;
 129     int bit;
 130     x86_reg coeff_count;
 131     x86_reg last=0;
 132     x86_reg state;
 133
 134 #ifdef BROKEN_RELOCATIONS
 135     void *tables;
 136
 137     __asm__ volatile(
 138         "lea    "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
 139         : "=&r"(tables)
 140         : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables)
 141     );
 142 #endif
 143
 144     __asm__ volatile(
 145         "mov %1, %6                             \n\t"
 146         "3:                                     \n\t"
 147
 148         "mov %10, %0                            \n\t"
 149         "movzb (%0, %6), %6                     \n\t"
 150         "add %9, %6                             \n\t"
 151
 152         BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
 153                              "%5", "%q5", "%k0", "%b0",
 154                              "%c12(%7)", "%c13(%7)",
 155                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
 156                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
 157                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
 158                              "%15")
 159
 160         "mov %1, %6                             \n\t"
 161         "test $1, %4                            \n\t"
 162         " jz 4f                                 \n\t"
 163
 164 #ifdef BROKEN_RELOCATIONS
 165         "movzb %c14(%15, %q6), %6\n\t"
 166 #else
 167         "movzb "MANGLE(ff_h264_cabac_tables)"+%c14(%6), %6\n\t"
 168 #endif
 169         "add %11, %6                            \n\t"
 170
 171         BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
 172                              "%5", "%q5", "%k0", "%b0",
 173                              "%c12(%7)", "%c13(%7)",
 174                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
 175                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
 176                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
 177                              "%15")
 178
 179         "mov %2, %0                             \n\t"
 180         "mov %1, %6                             \n\t"
 181         "mov %k6, (%0)                          \n\t"
 182
 183         "test $1, %4                            \n\t"
 184         " jnz 5f                                \n\t"
 185
 186         "add"OPSIZE"  $4, %2                    \n\t"
 187
 188         "4:                                     \n\t"
 189         "add $1, %6                             \n\t"
 190         "mov %6, %1                             \n\t"
 191         "cmp $63, %6                            \n\t"
 192         " jb 3b                                 \n\t"
 193         "mov %2, %0                             \n\t"
 194         "mov %k6, (%0)                          \n\t"
 195         "5:                                     \n\t"
 196         "addl %8, %k0                           \n\t"
 197         "shr $2, %k0                            \n\t"
 198         : "=&q"(coeff_count), "+"REG64(last), "+"REG64(index), "+&r"(c->low),
 199           "=&r"(bit), "+&r"(c->range), "=&r"(state)
 200         : "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base),
 201           REG64(sig_off), REG64(last_coeff_ctx_base),
 202           "i"(offsetof(CABACContext, bytestream)),
 203           "i"(offsetof(CABACContext, bytestream_end)),
 204           "i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG
 205         : "%"REG_c, "memory"
 206     );
 207     return coeff_count;
 208 }
 209 #endif /* HAVE_7REGS && BROKEN_COMPILER */
 210
 211 #endif /* HAVE_INLINE_ASM */
 212 #endif /* AVCODEC_X86_H264_I386_H */