2 * simple math operations
3 * Copyright (c) 2001, 2002 Fabrice Bellard
4 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
6 * This file is part of Libav.
8 * Libav 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.
13 * Libav 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.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with Libav; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #ifndef AVCODEC_MATHOPS_H
23 #define AVCODEC_MATHOPS_H
25 #include "libavutil/common.h"
28 # include "arm/mathops.h"
30 # include "avr32/mathops.h"
32 # include "bfin/mathops.h"
34 # include "mips/mathops.h"
36 # include "ppc/mathops.h"
38 # include "x86/mathops.h"
41 /* generic implementation */
44 # define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s))
48 static av_always_inline int MULH(int a, int b){
49 return ((int64_t)(a) * (int64_t)(b))>>32;
54 static av_always_inline unsigned UMULH(unsigned a, unsigned b){
55 return ((uint64_t)(a) * (uint64_t)(b))>>32;
60 # define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
64 # define MAC64(d, a, b) ((d) += MUL64(a, b))
68 # define MLS64(d, a, b) ((d) -= MUL64(a, b))
71 /* signed 16x16 -> 32 multiply add accumulate */
73 # define MAC16(rt, ra, rb) rt += (ra) * (rb)
76 /* signed 16x16 -> 32 multiply */
78 # define MUL16(ra, rb) ((ra) * (rb))
82 # define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb))
87 #define mid_pred mid_pred
88 static inline av_const int mid_pred(int a, int b, int c)
91 int t= (a-b)&((a-b)>>31);
94 b-= (b-c)&((b-c)>>31);
95 b+= (a-b)&((a-b)>>31);
116 static inline av_const int sign_extend(int val, unsigned bits)
118 return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits);
123 static inline av_const unsigned zero_extend(unsigned val, unsigned bits)
125 return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits);
130 #define COPY3_IF_LT(x, y, a, b, c, d)\
139 # define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
143 # define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
148 # define PACK_2U8(a,b) (((a) << 8) | (b))
151 # define PACK_4U8(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
154 # define PACK_2U16(a,b) (((a) << 16) | (b))
158 # define PACK_2U8(a,b) (((b) << 8) | (a))
161 # define PACK_4U8(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
164 # define PACK_2U16(a,b) (((b) << 16) | (a))
169 # define PACK_2S8(a,b) PACK_2U8((a)&255, (b)&255)
172 # define PACK_4S8(a,b,c,d) PACK_4U8((a)&255, (b)&255, (c)&255, (d)&255)
175 # define PACK_2S16(a,b) PACK_2U16((a)&0xffff, (b)&0xffff)
178 #endif /* AVCODEC_MATHOPS_H */