1/*
2 * simple math operations
3 * Copyright (c) 2001, 2002 Fabrice Bellard
4 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
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
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22#ifndef AVCODEC_MATHOPS_H
23#define AVCODEC_MATHOPS_H
24
25#include "libavutil/common.h"
26
27#if   ARCH_ARM
28#   include "arm/mathops.h"
29#elif ARCH_AVR32
30#   include "avr32/mathops.h"
31#elif ARCH_BFIN
32#   include "bfin/mathops.h"
33#elif ARCH_MIPS
34#   include "mips/mathops.h"
35#elif ARCH_PPC
36#   include "ppc/mathops.h"
37#elif ARCH_X86
38#   include "x86/mathops.h"
39#endif
40
41/* generic implementation */
42
43#ifndef MULL
44#   define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s))
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
51static av_always_inline int MULH(int a, int b){
52    return ((int64_t)(a) * (int64_t)(b))>>32;
53}
54#endif
55
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
62#ifndef MUL64
63#   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
64#endif
65
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
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
84#ifndef MLS16
85#   define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb))
86#endif
87
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
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
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
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
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
149#endif /* AVCODEC_MATHOPS_H */
150
151