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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.  
  27. #include "libavutil/common.h"
  28. #include "libavutil/x86/asm.h"
  29.  
  30. #if HAVE_INLINE_ASM
  31.  
  32. #if ARCH_X86_32
  33.  
  34. #define MULL MULL
  35. static av_always_inline av_const int MULL(int a, int b, unsigned shift)
  36. {
  37.     int rt, dummy;
  38.     __asm__ (
  39.         "imull %3               \n\t"
  40.         "shrdl %4, %%edx, %%eax \n\t"
  41.         :"=a"(rt), "=d"(dummy)
  42.         :"a"(a), "rm"(b), "ci"((uint8_t)shift)
  43.     );
  44.     return rt;
  45. }
  46.  
  47. #define MULH MULH
  48. static av_always_inline av_const int MULH(int a, int b)
  49. {
  50.     int rt, dummy;
  51.     __asm__ (
  52.         "imull %3"
  53.         :"=d"(rt), "=a"(dummy)
  54.         :"a"(a), "rm"(b)
  55.     );
  56.     return rt;
  57. }
  58.  
  59. #define MUL64 MUL64
  60. static av_always_inline av_const int64_t MUL64(int a, int b)
  61. {
  62.     int64_t rt;
  63.     __asm__ (
  64.         "imull %2"
  65.         :"=A"(rt)
  66.         :"a"(a), "rm"(b)
  67.     );
  68.     return rt;
  69. }
  70.  
  71. #endif /* ARCH_X86_32 */
  72.  
  73. #if HAVE_I686
  74. /* median of 3 */
  75. #define mid_pred mid_pred
  76. static inline av_const int mid_pred(int a, int b, int c)
  77. {
  78.     int i=b;
  79.     __asm__ (
  80.         "cmp    %2, %1 \n\t"
  81.         "cmovg  %1, %0 \n\t"
  82.         "cmovg  %2, %1 \n\t"
  83.         "cmp    %3, %1 \n\t"
  84.         "cmovl  %3, %1 \n\t"
  85.         "cmp    %1, %0 \n\t"
  86.         "cmovg  %1, %0 \n\t"
  87.         :"+&r"(i), "+&r"(a)
  88.         :"r"(b), "r"(c)
  89.     );
  90.     return i;
  91. }
  92.  
  93. #if HAVE_6REGS
  94. #define COPY3_IF_LT(x, y, a, b, c, d)\
  95. __asm__ volatile(\
  96.     "cmpl  %0, %3       \n\t"\
  97.     "cmovl %3, %0       \n\t"\
  98.     "cmovl %4, %1       \n\t"\
  99.     "cmovl %5, %2       \n\t"\
  100.     : "+&r" (x), "+&r" (a), "+r" (c)\
  101.     : "r" (y), "r" (b), "r" (d)\
  102. );
  103. #endif /* HAVE_6REGS */
  104.  
  105. #endif /* HAVE_I686 */
  106.  
  107. #define MASK_ABS(mask, level)                   \
  108.     __asm__ ("cdq                    \n\t"      \
  109.              "xorl %1, %0            \n\t"      \
  110.              "subl %1, %0            \n\t"      \
  111.              : "+a"(level), "=&d"(mask))
  112.  
  113. // avoid +32 for shift optimization (gcc should do that ...)
  114. #define NEG_SSR32 NEG_SSR32
  115. static inline  int32_t NEG_SSR32( int32_t a, int8_t s){
  116.     __asm__ ("sarl %1, %0\n\t"
  117.          : "+r" (a)
  118.          : "ic" ((uint8_t)(-s))
  119.     );
  120.     return a;
  121. }
  122.  
  123. #define NEG_USR32 NEG_USR32
  124. static inline uint32_t NEG_USR32(uint32_t a, int8_t s){
  125.     __asm__ ("shrl %1, %0\n\t"
  126.          : "+r" (a)
  127.          : "ic" ((uint8_t)(-s))
  128.     );
  129.     return a;
  130. }
  131.  
  132. #endif /* HAVE_INLINE_ASM */
  133. #endif /* AVCODEC_X86_MATHOPS_H */
  134.