LCOV - code coverage report
Current view: top level - libavcodec/x86 - cabac.h (source / functions) Hit Total Coverage
Test: coverage.info Lines: 11 11 100.0 %
Date: 2017-12-17 23:02:56 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
       3             :  *
       4             :  * This file is part of FFmpeg.
       5             :  *
       6             :  * FFmpeg is free software; you can redistribute it and/or
       7             :  * modify it under the terms of the GNU Lesser General Public
       8             :  * License as published by the Free Software Foundation; either
       9             :  * version 2.1 of the License, or (at your option) any later version.
      10             :  *
      11             :  * FFmpeg is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14             :  * Lesser General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU Lesser General Public
      17             :  * License along with FFmpeg; if not, write to the Free Software
      18             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      19             :  */
      20             : 
      21             : #ifndef AVCODEC_X86_CABAC_H
      22             : #define AVCODEC_X86_CABAC_H
      23             : 
      24             : #include "libavcodec/cabac.h"
      25             : #include "libavutil/attributes.h"
      26             : #include "libavutil/macros.h"
      27             : #include "libavutil/x86/asm.h"
      28             : #include "config.h"
      29             : 
      30             : #if   (defined(__i386) && defined(__clang__) && (__clang_major__<2 || (__clang_major__==2 && __clang_minor__<10)))\
      31             :    || (                  !defined(__clang__) && defined(__llvm__) && __GNUC__==4 && __GNUC_MINOR__==2 && __GNUC_PATCHLEVEL__<=1)\
      32             :    || (defined(__INTEL_COMPILER) && defined(_MSC_VER))
      33             : #       define BROKEN_COMPILER 1
      34             : #else
      35             : #       define BROKEN_COMPILER 0
      36             : #endif
      37             : 
      38             : #if HAVE_INLINE_ASM
      39             : 
      40             : #ifndef UNCHECKED_BITSTREAM_READER
      41             : #define UNCHECKED_BITSTREAM_READER !CONFIG_SAFE_BITSTREAM_READER
      42             : #endif
      43             : 
      44             : #if UNCHECKED_BITSTREAM_READER
      45             : #define END_CHECK(end) ""
      46             : #else
      47             : #define END_CHECK(end) \
      48             :         "cmp    "end"       , %%"FF_REG_c"                              \n\t"\
      49             :         "jge    1f                                                      \n\t"
      50             : #endif
      51             : 
      52             : #ifdef BROKEN_RELOCATIONS
      53             : #define TABLES_ARG , "r"(tables)
      54             : 
      55             : #if HAVE_FAST_CMOV
      56             : #define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \
      57             :         "cmp    "low"       , "tmp"                        \n\t"\
      58             :         "cmova  %%ecx       , "range"                      \n\t"\
      59             :         "sbb    %%rcx       , %%rcx                        \n\t"\
      60             :         "and    %%ecx       , "tmp"                        \n\t"\
      61             :         "xor    %%rcx       , "retq"                       \n\t"\
      62             :         "sub    "tmp"       , "low"                        \n\t"
      63             : #else /* HAVE_FAST_CMOV */
      64             : #define BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp) \
      65             : /* P4 Prescott has crappy cmov,sbb,64-bit shift so avoid them */ \
      66             :         "sub    "low"       , "tmp"                        \n\t"\
      67             :         "sar    $31         , "tmp"                        \n\t"\
      68             :         "sub    %%ecx       , "range"                      \n\t"\
      69             :         "and    "tmp"       , "range"                      \n\t"\
      70             :         "add    %%ecx       , "range"                      \n\t"\
      71             :         "shl    $17         , %%ecx                        \n\t"\
      72             :         "and    "tmp"       , %%ecx                        \n\t"\
      73             :         "sub    %%ecx       , "low"                        \n\t"\
      74             :         "xor    "tmp"       , "ret"                        \n\t"\
      75             :         "movslq "ret"       , "retq"                       \n\t"
      76             : #endif /* HAVE_FAST_CMOV */
      77             : 
      78             : #define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \
      79             :         "movzbl "statep"    , "ret"                                     \n\t"\
      80             :         "mov    "range"     , "tmp"                                     \n\t"\
      81             :         "and    $0xC0       , "range"                                   \n\t"\
      82             :         "lea    ("ret", "range", 2), %%ecx                              \n\t"\
      83             :         "movzbl "lps_off"("tables", %%rcx), "range"                     \n\t"\
      84             :         "sub    "range"     , "tmp"                                     \n\t"\
      85             :         "mov    "tmp"       , %%ecx                                     \n\t"\
      86             :         "shl    $17         , "tmp"                                     \n\t"\
      87             :         BRANCHLESS_GET_CABAC_UPDATE(ret, retq, low, range, tmp)              \
      88             :         "movzbl "norm_off"("tables", "rangeq"), %%ecx                   \n\t"\
      89             :         "shl    %%cl        , "range"                                   \n\t"\
      90             :         "movzbl "mlps_off"+128("tables", "retq"), "tmp"                 \n\t"\
      91             :         "shl    %%cl        , "low"                                     \n\t"\
      92             :         "mov    "tmpbyte"   , "statep"                                  \n\t"\
      93             :         "test   "lowword"   , "lowword"                                 \n\t"\
      94             :         "jnz    2f                                                      \n\t"\
      95             :         "mov    "byte"      , %%"FF_REG_c"                              \n\t"\
      96             :         END_CHECK(end)\
      97             :         "add"FF_OPSIZE" $2  , "byte"                                    \n\t"\
      98             :         "1:                                                             \n\t"\
      99             :         "movzwl (%%"FF_REG_c") , "tmp"                                  \n\t"\
     100             :         "lea    -1("low")   , %%ecx                                     \n\t"\
     101             :         "xor    "low"       , %%ecx                                     \n\t"\
     102             :         "shr    $15         , %%ecx                                     \n\t"\
     103             :         "bswap  "tmp"                                                   \n\t"\
     104             :         "shr    $15         , "tmp"                                     \n\t"\
     105             :         "movzbl "norm_off"("tables", %%rcx), %%ecx                      \n\t"\
     106             :         "sub    $0xFFFF     , "tmp"                                     \n\t"\
     107             :         "neg    %%ecx                                                   \n\t"\
     108             :         "add    $7          , %%ecx                                     \n\t"\
     109             :         "shl    %%cl        , "tmp"                                     \n\t"\
     110             :         "add    "tmp"       , "low"                                     \n\t"\
     111             :         "2:                                                             \n\t"
     112             : 
     113             : #else /* BROKEN_RELOCATIONS */
     114             : #define TABLES_ARG NAMED_CONSTRAINTS_ARRAY_ADD(ff_h264_cabac_tables)
     115             : #define RIP_ARG
     116             : 
     117             : #if HAVE_FAST_CMOV
     118             : #define BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)\
     119             :         "mov    "tmp"       , %%ecx     \n\t"\
     120             :         "shl    $17         , "tmp"     \n\t"\
     121             :         "cmp    "low"       , "tmp"     \n\t"\
     122             :         "cmova  %%ecx       , "range"   \n\t"\
     123             :         "sbb    %%ecx       , %%ecx     \n\t"\
     124             :         "and    %%ecx       , "tmp"     \n\t"\
     125             :         "xor    %%ecx       , "ret"     \n\t"\
     126             :         "sub    "tmp"       , "low"     \n\t"
     127             : #else /* HAVE_FAST_CMOV */
     128             : #define BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)\
     129             :         "mov    "tmp"       , %%ecx     \n\t"\
     130             :         "shl    $17         , "tmp"     \n\t"\
     131             :         "sub    "low"       , "tmp"     \n\t"\
     132             :         "sar    $31         , "tmp"     \n\t" /*lps_mask*/\
     133             :         "sub    %%ecx       , "range"   \n\t" /*RangeLPS - range*/\
     134             :         "and    "tmp"       , "range"   \n\t" /*(RangeLPS - range)&lps_mask*/\
     135             :         "add    %%ecx       , "range"   \n\t" /*new range*/\
     136             :         "shl    $17         , %%ecx     \n\t"\
     137             :         "and    "tmp"       , %%ecx     \n\t"\
     138             :         "sub    %%ecx       , "low"     \n\t"\
     139             :         "xor    "tmp"       , "ret"     \n\t"
     140             : #endif /* HAVE_FAST_CMOV */
     141             : 
     142             : #define BRANCHLESS_GET_CABAC(ret, retq, statep, low, lowword, range, rangeq, tmp, tmpbyte, byte, end, norm_off, lps_off, mlps_off, tables) \
     143             :         "movzbl "statep"    , "ret"                                     \n\t"\
     144             :         "mov    "range"     , "tmp"                                     \n\t"\
     145             :         "and    $0xC0       , "range"                                   \n\t"\
     146             :         "movzbl "MANGLE(ff_h264_cabac_tables)"+"lps_off"("ret", "range", 2), "range" \n\t"\
     147             :         "sub    "range"     , "tmp"                                     \n\t"\
     148             :         BRANCHLESS_GET_CABAC_UPDATE(ret, low, range, tmp)                    \
     149             :         "movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"("range"), %%ecx    \n\t"\
     150             :         "shl    %%cl        , "range"                                   \n\t"\
     151             :         "movzbl "MANGLE(ff_h264_cabac_tables)"+"mlps_off"+128("ret"), "tmp"  \n\t"\
     152             :         "shl    %%cl        , "low"                                     \n\t"\
     153             :         "mov    "tmpbyte"   , "statep"                                  \n\t"\
     154             :         "test   "lowword"   , "lowword"                                 \n\t"\
     155             :         " jnz   2f                                                      \n\t"\
     156             :         "mov    "byte"      , %%"FF_REG_c"                              \n\t"\
     157             :         END_CHECK(end)\
     158             :         "add"FF_OPSIZE" $2  , "byte"                                    \n\t"\
     159             :         "1:                                                             \n\t"\
     160             :         "movzwl (%%"FF_REG_c") , "tmp"                                  \n\t"\
     161             :         "lea    -1("low")   , %%ecx                                     \n\t"\
     162             :         "xor    "low"       , %%ecx                                     \n\t"\
     163             :         "shr    $15         , %%ecx                                     \n\t"\
     164             :         "bswap  "tmp"                                                   \n\t"\
     165             :         "shr    $15         , "tmp"                                     \n\t"\
     166             :         "movzbl "MANGLE(ff_h264_cabac_tables)"+"norm_off"(%%ecx), %%ecx \n\t"\
     167             :         "sub    $0xFFFF     , "tmp"                                     \n\t"\
     168             :         "neg    %%ecx                                                   \n\t"\
     169             :         "add    $7          , %%ecx                                     \n\t"\
     170             :         "shl    %%cl        , "tmp"                                     \n\t"\
     171             :         "add    "tmp"       , "low"                                     \n\t"\
     172             :         "2:                                                             \n\t"
     173             : 
     174             : #endif /* BROKEN_RELOCATIONS */
     175             : 
     176             : #if HAVE_7REGS && !BROKEN_COMPILER
     177             : #define get_cabac_inline get_cabac_inline_x86
     178  1040518288 : static av_always_inline int get_cabac_inline_x86(CABACContext *c,
     179             :                                                  uint8_t *const state)
     180             : {
     181             :     int bit, tmp;
     182             : #ifdef BROKEN_RELOCATIONS
     183             :     void *tables;
     184             : 
     185  1040518288 :     __asm__ volatile(
     186             :         "lea    "MANGLE(ff_h264_cabac_tables)", %0      \n\t"
     187             :         : "=&r"(tables)
     188             :         : NAMED_CONSTRAINTS_ARRAY(ff_h264_cabac_tables)
     189             :     );
     190             : #endif
     191             : 
     192  1040518288 :     __asm__ volatile(
     193             :         BRANCHLESS_GET_CABAC("%0", "%q0", "(%4)", "%1", "%w1",
     194             :                              "%2", "%q2", "%3", "%b3",
     195             :                              "%c6(%5)", "%c7(%5)",
     196             :                              AV_STRINGIFY(H264_NORM_SHIFT_OFFSET),
     197             :                              AV_STRINGIFY(H264_LPS_RANGE_OFFSET),
     198             :                              AV_STRINGIFY(H264_MLPS_STATE_OFFSET),
     199             :                              "%8")
     200             :         : "=&r"(bit), "=&r"(c->low), "=&r"(c->range), "=&q"(tmp)
     201             :         : "r"(state), "r"(c),
     202             :           "i"(offsetof(CABACContext, bytestream)),
     203             :           "i"(offsetof(CABACContext, bytestream_end))
     204             :           TABLES_ARG
     205  1040518288 :           ,"1"(c->low), "2"(c->range)
     206             :         : "%"FF_REG_c, "memory"
     207             :     );
     208  1040518288 :     return bit & 1;
     209             : }
     210             : #endif /* HAVE_7REGS && !BROKEN_COMPILER */
     211             : 
     212             : #if !BROKEN_COMPILER
     213             : #define get_cabac_bypass_sign get_cabac_bypass_sign_x86
     214   168990126 : static av_always_inline int get_cabac_bypass_sign_x86(CABACContext *c, int val)
     215             : {
     216             :     x86_reg tmp;
     217   168990126 :     __asm__ volatile(
     218             :         "movl        %c6(%2), %k1       \n\t"
     219             :         "movl        %c3(%2), %%eax     \n\t"
     220             :         "shl             $17, %k1       \n\t"
     221             :         "add           %%eax, %%eax     \n\t"
     222             :         "sub             %k1, %%eax     \n\t"
     223             :         "cdq                            \n\t"
     224             :         "and           %%edx, %k1       \n\t"
     225             :         "add             %k1, %%eax     \n\t"
     226             :         "xor           %%edx, %%ecx     \n\t"
     227             :         "sub           %%edx, %%ecx     \n\t"
     228             :         "test           %%ax, %%ax      \n\t"
     229             :         "jnz              1f            \n\t"
     230             :         "mov         %c4(%2), %1        \n\t"
     231             :         "subl        $0xFFFF, %%eax     \n\t"
     232             :         "movzwl         (%1), %%edx     \n\t"
     233             :         "bswap         %%edx            \n\t"
     234             :         "shrl            $15, %%edx     \n\t"
     235             : #if UNCHECKED_BITSTREAM_READER
     236             :         "add              $2, %1        \n\t"
     237             :         "addl          %%edx, %%eax     \n\t"
     238             :         "mov              %1, %c4(%2)   \n\t"
     239             : #else
     240             :         "addl          %%edx, %%eax     \n\t"
     241             :         "cmp         %c5(%2), %1        \n\t"
     242             :         "jge              1f            \n\t"
     243             :         "add"FF_OPSIZE"   $2, %c4(%2)   \n\t"
     244             : #endif
     245             :         "1:                             \n\t"
     246             :         "movl          %%eax, %c3(%2)   \n\t"
     247             : 
     248             :         : "+c"(val), "=&r"(tmp)
     249             :         : "r"(c),
     250             :           "i"(offsetof(CABACContext, low)),
     251             :           "i"(offsetof(CABACContext, bytestream)),
     252             :           "i"(offsetof(CABACContext, bytestream_end)),
     253             :           "i"(offsetof(CABACContext, range))
     254             :         : "%eax", "%edx", "memory"
     255             :     );
     256   168990126 :     return val;
     257             : }
     258             : 
     259             : #define get_cabac_bypass get_cabac_bypass_x86
     260   315230779 : static av_always_inline int get_cabac_bypass_x86(CABACContext *c)
     261             : {
     262             :     x86_reg tmp;
     263             :     int res;
     264   315230779 :     __asm__ volatile(
     265             :         "movl        %c6(%2), %k1       \n\t"
     266             :         "movl        %c3(%2), %%eax     \n\t"
     267             :         "shl             $17, %k1       \n\t"
     268             :         "add           %%eax, %%eax     \n\t"
     269             :         "sub             %k1, %%eax     \n\t"
     270             :         "cdq                            \n\t"
     271             :         "and           %%edx, %k1       \n\t"
     272             :         "add             %k1, %%eax     \n\t"
     273             :         "inc           %%edx            \n\t"
     274             :         "test           %%ax, %%ax      \n\t"
     275             :         "jnz              1f            \n\t"
     276             :         "mov         %c4(%2), %1        \n\t"
     277             :         "subl        $0xFFFF, %%eax     \n\t"
     278             :         "movzwl         (%1), %%ecx     \n\t"
     279             :         "bswap         %%ecx            \n\t"
     280             :         "shrl            $15, %%ecx     \n\t"
     281             :         "addl          %%ecx, %%eax     \n\t"
     282             :         "cmp         %c5(%2), %1        \n\t"
     283             :         "jge              1f            \n\t"
     284             :         "add"FF_OPSIZE"   $2, %c4(%2)   \n\t"
     285             :         "1:                             \n\t"
     286             :         "movl          %%eax, %c3(%2)   \n\t"
     287             : 
     288             :         : "=&d"(res), "=&r"(tmp)
     289             :         : "r"(c),
     290             :           "i"(offsetof(CABACContext, low)),
     291             :           "i"(offsetof(CABACContext, bytestream)),
     292             :           "i"(offsetof(CABACContext, bytestream_end)),
     293             :           "i"(offsetof(CABACContext, range))
     294             :         : "%eax", "%ecx", "memory"
     295             :     );
     296   315230779 :     return res;
     297             : }
     298             : #endif /* !BROKEN_COMPILER */
     299             : 
     300             : #endif /* HAVE_INLINE_ASM */
     301             : #endif /* AVCODEC_X86_CABAC_H */

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