mathops.h

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/*
 * Simple math operations
 * Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */
 
#ifndef AVCODEC_AVR32_MATHOPS_H
#define AVCODEC_AVR32_MATHOPS_H
 
#include <stdint.h>
#include "config.h"
#include "libavutil/common.h"
 
#if HAVE_INLINE_ASM
 
#define MULL MULL
static inline av_const int MULL(int a, int b, unsigned shift)
{
    union { int64_t x; int hl[2]; } x;
    __asm__ ("muls.d %0, %1, %2       \n\t"
             "lsr    %0, %3           \n\t"
             "or     %0, %0, %m0<<%4  \n\t"
             : "=r"(x) : "r"(b), "r"(a), "i"(shift), "i"(32-shift));
    return x.hl[1];
}
 
#define MULH MULH
static inline av_const int MULH(int a, int b)
{
    union { int64_t x; int hl[2]; } x;
    __asm__ ("muls.d %0, %1, %2" : "=r"(x.x) : "r"(a), "r"(b));
    return x.hl[0];
}
 
#define MUL64 MUL64
static inline av_const int64_t MUL64(int a, int b)
{
    int64_t x;
    __asm__ ("muls.d %0, %1, %2" : "=r"(x) : "r"(a), "r"(b));
    return x;
}
 
static inline av_const int64_t MAC64(int64_t d, int a, int b)
{
    __asm__ ("macs.d %0, %1, %2" : "+r"(d) : "r"(a), "r"(b));
    return d;
}
#define MAC64(d, a, b) ((d) = MAC64(d, a, b))
#define MLS64(d, a, b) MAC64(d, -(a), b)
 
static inline av_const int MAC16(int d, int a, int b)
{
    __asm__ ("machh.w %0, %1:b, %2:b" : "+r"(d) : "r"(a), "r"(b));
    return d;
}
#define MAC16(d, a, b) ((d) = MAC16(d, a, b))
#define MLS16(d, a, b) MAC16(d, -(a), b)
 
#define MUL16 MUL16
static inline av_const int MUL16(int a, int b)
{
    int d;
    __asm__ ("mulhh.w %0, %1:b, %2:b" : "=r"(d) : "r"(a), "r"(b));
    return d;
}
 
#define mid_pred mid_pred
static inline av_const int mid_pred(int a, int b, int c)
{
    int m;
    __asm__ ("mov   %0, %2  \n\t"
             "cp.w  %1, %2  \n\t"
             "movgt %0, %1  \n\t"
             "movgt %1, %2  \n\t"
             "cp.w  %1, %3  \n\t"
             "movle %1, %3  \n\t"
             "cp.w  %0, %1  \n\t"
             "movgt %0, %1  \n\t"
             : "=&r"(m), "+r"(a)
             : "r"(b), "r"(c));
    return m;
}
 
#endif /* HAVE_INLINE_ASM */
 
#endif /* AVCODEC_AVR32_MATHOPS_H */