intmath.h

   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 */