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intmath.h
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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 */