Add zero_extend() function
[libav.git] / libavcodec / mathops.h
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1/*
2 * simple math operations
406792e7 3 * Copyright (c) 2001, 2002 Fabrice Bellard
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4 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
5 *
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6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
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9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
b78e7197 11 * version 2.1 of the License, or (at your option) any later version.
99aed7c8 12 *
b78e7197 13 * FFmpeg is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
b78e7197 19 * License along with FFmpeg; if not, write to the Free Software
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20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
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22#ifndef AVCODEC_MATHOPS_H
23#define AVCODEC_MATHOPS_H
99aed7c8 24
245976da 25#include "libavutil/common.h"
99545457 26
e20a4f53 27#if ARCH_ARM
26f6a574 28# include "arm/mathops.h"
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29#elif ARCH_AVR32
30# include "avr32/mathops.h"
b250f9c6 31#elif ARCH_BFIN
26f6a574 32# include "bfin/mathops.h"
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33#elif ARCH_MIPS
34# include "mips/mathops.h"
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35#elif ARCH_PPC
36# include "ppc/mathops.h"
37#elif ARCH_X86
38# include "x86/mathops.h"
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39#endif
40
41/* generic implementation */
42
43#ifndef MULL
4deaa946 44# define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s))
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45#endif
46
47#ifndef MULH
48//gcc 3.4 creates an incredibly bloated mess out of this
49//# define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32)
50
849f1035 51static av_always_inline int MULH(int a, int b){
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52 return ((int64_t)(a) * (int64_t)(b))>>32;
53}
54#endif
55
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56#ifndef UMULH
57static av_always_inline unsigned UMULH(unsigned a, unsigned b){
58 return ((uint64_t)(a) * (uint64_t)(b))>>32;
59}
60#endif
61
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62#ifndef MUL64
63# define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
64#endif
65
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66#ifndef MAC64
67# define MAC64(d, a, b) ((d) += MUL64(a, b))
68#endif
69
70#ifndef MLS64
71# define MLS64(d, a, b) ((d) -= MUL64(a, b))
72#endif
73
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74/* signed 16x16 -> 32 multiply add accumulate */
75#ifndef MAC16
76# define MAC16(rt, ra, rb) rt += (ra) * (rb)
77#endif
78
79/* signed 16x16 -> 32 multiply */
80#ifndef MUL16
81# define MUL16(ra, rb) ((ra) * (rb))
82#endif
83
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84#ifndef MLS16
85# define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb))
86#endif
87
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88/* median of 3 */
89#ifndef mid_pred
90#define mid_pred mid_pred
91static inline av_const int mid_pred(int a, int b, int c)
92{
93#if 0
94 int t= (a-b)&((a-b)>>31);
95 a-=t;
96 b+=t;
97 b-= (b-c)&((b-c)>>31);
98 b+= (a-b)&((a-b)>>31);
99
100 return b;
101#else
102 if(a>b){
103 if(c>b){
104 if(c>a) b=a;
105 else b=c;
106 }
107 }else{
108 if(b>c){
109 if(c>a) b=c;
110 else b=a;
111 }
112 }
113 return b;
114#endif
115}
116#endif
117
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118#ifndef sign_extend
119static inline av_const int sign_extend(int val, unsigned bits)
120{
121 return (val << (INT_BIT - bits)) >> (INT_BIT - bits);
122}
123#endif
124
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125#ifndef zero_extend
126static inline av_const unsigned zero_extend(unsigned val, unsigned bits)
127{
128 return (val << (INT_BIT - bits)) >> (INT_BIT - bits);
129}
130#endif
131
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132#ifndef COPY3_IF_LT
133#define COPY3_IF_LT(x, y, a, b, c, d)\
134if ((y) < (x)) {\
135 (x) = (y);\
136 (a) = (b);\
137 (c) = (d);\
138}
139#endif
140
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141#ifndef NEG_SSR32
142# define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
143#endif
144
145#ifndef NEG_USR32
146# define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
147#endif
148
98790382 149#endif /* AVCODEC_MATHOPS_H */
99aed7c8 150