LCOV - code coverage report
Current view: top level - src/libavcodec/x86 - h264_cabac.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 14 14 100.0 %
Date: 2017-06-23 19:00:59 Functions: 2 2 100.0 %

          Line data    Source code
       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 / MPEG-4 part10 codec.
      25             :  * non-SIMD x86-specific optimizations for H.264
      26             :  * @author Michael Niedermayer <michaelni@gmx.at>
      27             :  */
      28             : 
      29             : #include <stddef.h>
      30             : 
      31             : #include "libavcodec/cabac.h"
      32             : #include "cabac.h"
      33             : 
      34             : #if HAVE_INLINE_ASM
      35             : 
      36             : #if ARCH_X86_64
      37             : #define REG64 "r"
      38             : #else
      39             : #define REG64 "m"
      40             : #endif
      41             : 
      42             : //FIXME use some macros to avoid duplicating get_cabac (cannot be done yet
      43             : //as that would make optimization work hard)
      44             : #if HAVE_7REGS && !BROKEN_COMPILER
      45             : #define decode_significance decode_significance_x86
      46    33055097 : static int decode_significance_x86(CABACContext *c, int max_coeff,
      47             :                                    uint8_t *significant_coeff_ctx_base,
      48             :                                    int *index, x86_reg last_off){
      49    33055097 :     void *end= significant_coeff_ctx_base + max_coeff - 1;
      50    33055097 :     int minusstart= -(intptr_t)significant_coeff_ctx_base;
      51    33055097 :     int minusindex= 4-(intptr_t)index;
      52             :     int bit;
      53             :     x86_reg coeff_count;
      54             : 
      55             : #ifdef BROKEN_RELOCATIONS
      56             :     void *tables;
      57             : 
      58             :     __asm__ volatile(
      59             :         "lea   "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
      60             :         : "=&r"(tables)
      61             :         : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables)
      62             :     );
      63             : #endif
      64             : 
      65    33055097 :     __asm__ volatile(
      66             :         "3:                                     \n\t"
      67             : 
      68             :         BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
      69             :                              "%5", "%q5", "%k0", "%b0",
      70             :                              "%c11(%6)", "%c12(%6)",
      71             :                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
      72             :                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
      73             :                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
      74             :                              "%13")
      75             : 
      76             :         "test $1, %4                            \n\t"
      77             :         " jz 4f                                 \n\t"
      78             :         "add  %10, %1                           \n\t"
      79             : 
      80             :         BRANCHLESS_GET_CABAC("%4", "%q4", "(%1)", "%3", "%w3",
      81             :                              "%5", "%q5", "%k0", "%b0",
      82             :                              "%c11(%6)", "%c12(%6)",
      83             :                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
      84             :                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
      85             :                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
      86             :                              "%13")
      87             : 
      88             :         "sub  %10, %1                           \n\t"
      89             :         "mov  %2, %0                            \n\t"
      90             :         "movl %7, %%ecx                         \n\t"
      91             :         "add  %1, %%"FF_REG_c"                  \n\t"
      92             :         "movl %%ecx, (%0)                       \n\t"
      93             : 
      94             :         "test $1, %4                            \n\t"
      95             :         " jnz 5f                                \n\t"
      96             : 
      97             :         "add"FF_OPSIZE"  $4, %2                 \n\t"
      98             : 
      99             :         "4:                                     \n\t"
     100             :         "add  $1, %1                            \n\t"
     101             :         "cmp  %8, %1                            \n\t"
     102             :         " jb 3b                                 \n\t"
     103             :         "mov  %2, %0                            \n\t"
     104             :         "movl %7, %%ecx                         \n\t"
     105             :         "add  %1, %%"FF_REG_c"                  \n\t"
     106             :         "movl %%ecx, (%0)                       \n\t"
     107             :         "5:                                     \n\t"
     108             :         "add  %9, %k0                           \n\t"
     109             :         "shr $2, %k0                            \n\t"
     110             :         : "=&q"(coeff_count), "+r"(significant_coeff_ctx_base), "+m"(index),
     111    33055097 :           "+&r"(c->low), "=&r"(bit), "+&r"(c->range)
     112             :         : "r"(c), "m"(minusstart), "m"(end), "m"(minusindex), "m"(last_off),
     113             :           "i"(offsetof(CABACContext, bytestream)),
     114             :           "i"(offsetof(CABACContext, bytestream_end))
     115             :           TABLES_ARG
     116             :         : "%"FF_REG_c, "memory"
     117             :     );
     118    33055097 :     return coeff_count;
     119             : }
     120             : 
     121             : #define decode_significance_8x8 decode_significance_8x8_x86
     122     4789134 : static int decode_significance_8x8_x86(CABACContext *c,
     123             :                                        uint8_t *significant_coeff_ctx_base,
     124             :                                        int *index, uint8_t *last_coeff_ctx_base, const uint8_t *sig_off){
     125     4789134 :     int minusindex= 4-(intptr_t)index;
     126             :     int bit;
     127             :     x86_reg coeff_count;
     128     4789134 :     x86_reg last=0;
     129             :     x86_reg state;
     130             : 
     131             : #ifdef BROKEN_RELOCATIONS
     132             :     void *tables;
     133             : 
     134             :     __asm__ volatile(
     135             :         "lea    "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
     136             :         : "=&r"(tables)
     137             :         : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables)
     138             :     );
     139             : #endif
     140             : 
     141     4789134 :     __asm__ volatile(
     142             :         "mov %1, %6                             \n\t"
     143             :         "3:                                     \n\t"
     144             : 
     145             :         "mov %10, %0                            \n\t"
     146             :         "movzb (%0, %6), %6                     \n\t"
     147             :         "add %9, %6                             \n\t"
     148             : 
     149             :         BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
     150             :                              "%5", "%q5", "%k0", "%b0",
     151             :                              "%c12(%7)", "%c13(%7)",
     152             :                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
     153             :                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
     154             :                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
     155             :                              "%15")
     156             : 
     157             :         "mov %1, %6                             \n\t"
     158             :         "test $1, %4                            \n\t"
     159             :         " jz 4f                                 \n\t"
     160             : 
     161             : #ifdef BROKEN_RELOCATIONS
     162             :         "movzb %c14(%15, %q6), %6\n\t"
     163             : #else
     164             :         "movzb "MANGLE(ff_h264_cabac_tables)"+%c14(%6), %6\n\t"
     165             : #endif
     166             :         "add %11, %6                            \n\t"
     167             : 
     168             :         BRANCHLESS_GET_CABAC("%4", "%q4", "(%6)", "%3", "%w3",
     169             :                              "%5", "%q5", "%k0", "%b0",
     170             :                              "%c12(%7)", "%c13(%7)",
     171             :                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
     172             :                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
     173             :                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
     174             :                              "%15")
     175             : 
     176             :         "mov %2, %0                             \n\t"
     177             :         "mov %1, %6                             \n\t"
     178             :         "mov %k6, (%0)                          \n\t"
     179             : 
     180             :         "test $1, %4                            \n\t"
     181             :         " jnz 5f                                \n\t"
     182             : 
     183             :         "add"FF_OPSIZE"  $4, %2                 \n\t"
     184             : 
     185             :         "4:                                     \n\t"
     186             :         "add $1, %6                             \n\t"
     187             :         "mov %6, %1                             \n\t"
     188             :         "cmp $63, %6                            \n\t"
     189             :         " jb 3b                                 \n\t"
     190             :         "mov %2, %0                             \n\t"
     191             :         "mov %k6, (%0)                          \n\t"
     192             :         "5:                                     \n\t"
     193             :         "addl %8, %k0                           \n\t"
     194             :         "shr $2, %k0                            \n\t"
     195     4789134 :         : "=&q"(coeff_count), "+"REG64(last), "+"REG64(index), "+&r"(c->low),
     196     4789134 :           "=&r"(bit), "+&r"(c->range), "=&r"(state)
     197             :         : "r"(c), "m"(minusindex), "m"(significant_coeff_ctx_base),
     198             :           REG64(sig_off), REG64(last_coeff_ctx_base),
     199             :           "i"(offsetof(CABACContext, bytestream)),
     200             :           "i"(offsetof(CABACContext, bytestream_end)),
     201             :           "i"(H264_LAST_COEFF_FLAG_OFFSET_8x8_OFFSET) TABLES_ARG
     202             :         : "%"FF_REG_c, "memory"
     203             :     );
     204     4789134 :     return coeff_count;
     205             : }
     206             : #endif /* HAVE_7REGS && BROKEN_COMPILER */
     207             : 
     208             : #endif /* HAVE_INLINE_ASM */

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