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  1. /*
  2.  * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
  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 AVUTIL_ARM_INTMATH_H
  22. #define AVUTIL_ARM_INTMATH_H
  23.  
  24. #include <stdint.h>
  25.  
  26. #include "config.h"
  27. #include "libavutil/attributes.h"
  28.  
  29. #if HAVE_INLINE_ASM
  30.  
  31. #if HAVE_ARMV6_INLINE
  32.  
  33. #define av_clip_uint8 av_clip_uint8_arm
  34. static av_always_inline av_const unsigned av_clip_uint8_arm(int a)
  35. {
  36.     unsigned x;
  37.     __asm__ ("usat %0, #8,  %1" : "=r"(x) : "r"(a));
  38.     return x;
  39. }
  40.  
  41. #define av_clip_int8 av_clip_int8_arm
  42. static av_always_inline av_const int av_clip_int8_arm(int a)
  43. {
  44.     int x;
  45.     __asm__ ("ssat %0, #8,  %1" : "=r"(x) : "r"(a));
  46.     return x;
  47. }
  48.  
  49. #define av_clip_uint16 av_clip_uint16_arm
  50. static av_always_inline av_const unsigned av_clip_uint16_arm(int a)
  51. {
  52.     unsigned x;
  53.     __asm__ ("usat %0, #16, %1" : "=r"(x) : "r"(a));
  54.     return x;
  55. }
  56.  
  57. #define av_clip_int16 av_clip_int16_arm
  58. static av_always_inline av_const int av_clip_int16_arm(int a)
  59. {
  60.     int x;
  61.     __asm__ ("ssat %0, #16, %1" : "=r"(x) : "r"(a));
  62.     return x;
  63. }
  64.  
  65. #define av_clip_uintp2 av_clip_uintp2_arm
  66. static av_always_inline av_const unsigned av_clip_uintp2_arm(int a, int p)
  67. {
  68.     unsigned x;
  69.     __asm__ ("usat %0, %2, %1" : "=r"(x) : "r"(a), "i"(p));
  70.     return x;
  71. }
  72.  
  73. #define av_sat_add32 av_sat_add32_arm
  74. static av_always_inline int av_sat_add32_arm(int a, int b)
  75. {
  76.     int r;
  77.     __asm__ ("qadd %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
  78.     return r;
  79. }
  80.  
  81. #define av_sat_dadd32 av_sat_dadd32_arm
  82. static av_always_inline int av_sat_dadd32_arm(int a, int b)
  83. {
  84.     int r;
  85.     __asm__ ("qdadd %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
  86.     return r;
  87. }
  88.  
  89. #endif /* HAVE_ARMV6_INLINE */
  90.  
  91. #if HAVE_ASM_MOD_Q
  92.  
  93. #define av_clipl_int32 av_clipl_int32_arm
  94. static av_always_inline av_const int32_t av_clipl_int32_arm(int64_t a)
  95. {
  96.     int x, y;
  97.     __asm__ ("adds   %1, %R2, %Q2, lsr #31  \n\t"
  98.              "itet   ne                     \n\t"
  99.              "mvnne  %1, #1<<31             \n\t"
  100.              "moveq  %0, %Q2                \n\t"
  101.              "eorne  %0, %1,  %R2, asr #31  \n\t"
  102.              : "=r"(x), "=&r"(y) : "r"(a) : "cc");
  103.     return x;
  104. }
  105.  
  106. #endif /* HAVE_ASM_MOD_Q */
  107.  
  108. #endif /* HAVE_INLINE_ASM */
  109.  
  110. #endif /* AVUTIL_ARM_INTMATH_H */
  111.