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ffmpeg / libavcodec / arm / mathops.h @ a2fc0f6a

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/*
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 * simple math operations
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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 FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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_ARM_MATHOPS_H
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#define AVCODEC_ARM_MATHOPS_H
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#include <stdint.h>
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#include "libavutil/common.h"
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#   define MULL MULL
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static inline av_const int MULL(int a, int b, unsigned shift)
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{
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    int lo, hi;
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    __asm__("smull %0, %1, %2, %3     \n\t"
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            "mov   %0, %0,     lsr %4 \n\t"
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            "add   %1, %0, %1, lsl %5 \n\t"
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            : "=&r"(lo), "=&r"(hi)
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            : "r"(b), "r"(a), "i"(shift), "i"(32-shift));
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    return hi;
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}
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#define MULH MULH
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#ifdef HAVE_ARMV6
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static inline av_const int MULH(int a, int b)
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{
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    int r;
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    __asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
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    return r;
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}
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#else
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static inline av_const int MULH(int a, int b)
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{
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    int lo, hi;
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    __asm__ ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));
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    return hi;
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}
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#endif
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static inline av_const int64_t MUL64(int a, int b)
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{
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    union { uint64_t x; unsigned hl[2]; } x;
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    __asm__ ("smull %0, %1, %2, %3"
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             : "=r"(x.hl[0]), "=r"(x.hl[1]) : "r"(a), "r"(b));
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    return x.x;
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}
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#define MUL64 MUL64
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static inline av_const int64_t MAC64(int64_t d, int a, int b)
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{
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    union { uint64_t x; unsigned hl[2]; } x = { d };
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    __asm__ ("smlal %0, %1, %2, %3"
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             : "+r"(x.hl[0]), "+r"(x.hl[1]) : "r"(a), "r"(b));
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    return x.x;
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}
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#define MAC64(d, a, b) ((d) = MAC64(d, a, b))
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#define MLS64(d, a, b) MAC64(d, -(a), b)
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#if defined(HAVE_ARMV5TE)
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/* signed 16x16 -> 32 multiply add accumulate */
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#   define MAC16(rt, ra, rb)                                            \
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    __asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb));
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/* signed 16x16 -> 32 multiply */
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#   define MUL16 MUL16
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static inline av_const MUL16(int ra, int rb)
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{
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    int rt;
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    __asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb));
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    return rt;
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}
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#endif
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#endif /* AVCODEC_ARM_MATHOPS_H */