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/*
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 * simple math operations
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 * Copyright (c) 2001, 2002 Fabrice Bellard
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 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
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 *
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVCODEC_MATHOPS_H
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#define AVCODEC_MATHOPS_H
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#include "libavutil/common.h"
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#if   ARCH_ARM
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#   include "arm/mathops.h"
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#elif ARCH_AVR32
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#   include "avr32/mathops.h"
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#elif ARCH_BFIN
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#   include "bfin/mathops.h"
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#elif ARCH_MIPS
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#   include "mips/mathops.h"
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#elif ARCH_PPC
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#   include "ppc/mathops.h"
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#elif ARCH_X86
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#   include "x86/mathops.h"
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#endif
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/* generic implementation */
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#ifndef MULL
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#   define MULL(a,b,s) (((int64_t)(a) * (int64_t)(b)) >> (s))
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#endif
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#ifndef MULH
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//gcc 3.4 creates an incredibly bloated mess out of this
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//#    define MULH(a,b) (((int64_t)(a) * (int64_t)(b))>>32)
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static av_always_inline int MULH(int a, int b){
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    return ((int64_t)(a) * (int64_t)(b))>>32;
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}
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#endif
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#ifndef UMULH
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static av_always_inline unsigned UMULH(unsigned a, unsigned b){
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    return ((uint64_t)(a) * (uint64_t)(b))>>32;
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}
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#endif
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#ifndef MUL64
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#   define MUL64(a,b) ((int64_t)(a) * (int64_t)(b))
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#endif
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#ifndef MAC64
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#   define MAC64(d, a, b) ((d) += MUL64(a, b))
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#endif
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#ifndef MLS64
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#   define MLS64(d, a, b) ((d) -= MUL64(a, b))
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#endif
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/* signed 16x16 -> 32 multiply add accumulate */
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#ifndef MAC16
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#   define MAC16(rt, ra, rb) rt += (ra) * (rb)
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#endif
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/* signed 16x16 -> 32 multiply */
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#ifndef MUL16
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#   define MUL16(ra, rb) ((ra) * (rb))
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#endif
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#ifndef MLS16
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#   define MLS16(rt, ra, rb) ((rt) -= (ra) * (rb))
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#endif
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/* median of 3 */
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#ifndef mid_pred
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#define mid_pred mid_pred
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static inline av_const int mid_pred(int a, int b, int c)
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{
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#if 0
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    int t= (a-b)&((a-b)>>31);
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    a-=t;
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    b+=t;
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    b-= (b-c)&((b-c)>>31);
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    b+= (a-b)&((a-b)>>31);
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    return b;
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#else
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    if(a>b){
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        if(c>b){
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            if(c>a) b=a;
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            else    b=c;
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        }
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    }else{
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        if(b>c){
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            if(c>a) b=c;
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            else    b=a;
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        }
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    }
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    return b;
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#endif
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}
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#endif
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#ifndef sign_extend
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static inline av_const int sign_extend(int val, unsigned bits)
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{
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    return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits);
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}
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#endif
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#ifndef zero_extend
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static inline av_const unsigned zero_extend(unsigned val, unsigned bits)
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{
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    return (val << ((8 * sizeof(int)) - bits)) >> ((8 * sizeof(int)) - bits);
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}
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#endif
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#ifndef COPY3_IF_LT
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#define COPY3_IF_LT(x, y, a, b, c, d)\
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if ((y) < (x)) {\
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    (x) = (y);\
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    (a) = (b);\
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    (c) = (d);\
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}
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#endif
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#ifndef NEG_SSR32
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#   define NEG_SSR32(a,s) ((( int32_t)(a))>>(32-(s)))
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#endif
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#ifndef NEG_USR32
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#   define NEG_USR32(a,s) (((uint32_t)(a))>>(32-(s)))
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#endif
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#if HAVE_BIGENDIAN
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# ifndef PACK_2U8
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#   define PACK_2U8(a,b)     (((a) <<  8) | (b))
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# endif
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# ifndef PACK_4U8
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#   define PACK_4U8(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
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# endif
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# ifndef PACK_2U16
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#   define PACK_2U16(a,b)    (((a) << 16) | (b))
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# endif
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#else
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# ifndef PACK_2U8
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#   define PACK_2U8(a,b)     (((b) <<  8) | (a))
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# endif
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# ifndef PACK_4U2
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#   define PACK_4U8(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
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# endif
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# ifndef PACK_2U16
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#   define PACK_2U16(a,b)    (((b) << 16) | (a))
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# endif
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#endif
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#ifndef PACK_2S8
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#   define PACK_2S8(a,b)     PACK_2U8((a)&255, (b)&255)
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#endif
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#ifndef PACK_4S8
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#   define PACK_4S8(a,b,c,d) PACK_4U8((a)&255, (b)&255, (c)&255, (d)&255)
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#endif
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#ifndef PACK_2S16
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#   define PACK_2S16(a,b)    PACK_2U16((a)&0xffff, (b)&0xffff)
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#endif
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#endif /* AVCODEC_MATHOPS_H */
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