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  1. /*
  2.  * simple math operations
  3.  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
  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. #ifndef AVCODEC_X86_MATHOPS_H
  23. #define AVCODEC_X86_MATHOPS_H
  24.  
  25. #include "config.h"
  26. #include "libavutil/common.h"
  27.  
  28. #if HAVE_INLINE_ASM
  29.  
  30. #if ARCH_X86_32
  31.  
  32. #define MULL MULL
  33. static av_always_inline av_const int MULL(int a, int b, unsigned shift)
  34. {
  35.     int rt, dummy;
  36.     __asm__ (
  37.         "imull %3               \n\t"
  38.         "shrdl %4, %%edx, %%eax \n\t"
  39.         :"=a"(rt), "=d"(dummy)
  40.         :"a"(a), "rm"(b), "ci"((uint8_t)shift)
  41.     );
  42.     return rt;
  43. }
  44.  
  45. #define MULH MULH
  46. static av_always_inline av_const int MULH(int a, int b)
  47. {
  48.     int rt, dummy;
  49.     __asm__ (
  50.         "imull %3"
  51.         :"=d"(rt), "=a"(dummy)
  52.         :"a"(a), "rm"(b)
  53.     );
  54.     return rt;
  55. }
  56.  
  57. #define MUL64 MUL64
  58. static av_always_inline av_const int64_t MUL64(int a, int b)
  59. {
  60.     int64_t rt;
  61.     __asm__ (
  62.         "imull %2"
  63.         :"=A"(rt)
  64.         :"a"(a), "rm"(b)
  65.     );
  66.     return rt;
  67. }
  68.  
  69. #endif /* ARCH_X86_32 */
  70.  
  71. #if HAVE_I686
  72. /* median of 3 */
  73. #define mid_pred mid_pred
  74. static inline av_const int mid_pred(int a, int b, int c)
  75. {
  76.     int i=b;
  77.     __asm__ (
  78.         "cmp    %2, %1 \n\t"
  79.         "cmovg  %1, %0 \n\t"
  80.         "cmovg  %2, %1 \n\t"
  81.         "cmp    %3, %1 \n\t"
  82.         "cmovl  %3, %1 \n\t"
  83.         "cmp    %1, %0 \n\t"
  84.         "cmovg  %1, %0 \n\t"
  85.         :"+&r"(i), "+&r"(a)
  86.         :"r"(b), "r"(c)
  87.     );
  88.     return i;
  89. }
  90.  
  91. #define COPY3_IF_LT(x, y, a, b, c, d)\
  92. __asm__ volatile(\
  93.     "cmpl  %0, %3       \n\t"\
  94.     "cmovl %3, %0       \n\t"\
  95.     "cmovl %4, %1       \n\t"\
  96.     "cmovl %5, %2       \n\t"\
  97.     : "+&r" (x), "+&r" (a), "+r" (c)\
  98.     : "r" (y), "r" (b), "r" (d)\
  99. );
  100. #endif /* HAVE_I686 */
  101.  
  102. #define MASK_ABS(mask, level)                   \
  103.     __asm__ ("cltd                   \n\t"      \
  104.              "xorl %1, %0            \n\t"      \
  105.              "subl %1, %0            \n\t"      \
  106.              : "+a"(level), "=&d"(mask))
  107.  
  108. // avoid +32 for shift optimization (gcc should do that ...)
  109. #define NEG_SSR32 NEG_SSR32
  110. static inline  int32_t NEG_SSR32( int32_t a, int8_t s){
  111.     __asm__ ("sarl %1, %0\n\t"
  112.          : "+r" (a)
  113.          : "ic" ((uint8_t)(-s))
  114.     );
  115.     return a;
  116. }
  117.  
  118. #define NEG_USR32 NEG_USR32
  119. static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
  120.     __asm__ ("shrl %1, %0\n\t"
  121.          : "+r" (a)
  122.          : "ic" ((uint8_t)(-s))
  123.     );
  124.     return a;
  125. }
  126.  
  127. #endif /* HAVE_INLINE_ASM */
  128. #endif /* AVCODEC_X86_MATHOPS_H */
  129.