mathops.h 1.45 KB
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/*
 * simple math operations
 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
 *
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 * This file is part of FFmpeg.
 *
 * 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
 * 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
 * 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
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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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#ifndef FFMPEG_I386_MATHOPS_H
#define FFMPEG_I386_MATHOPS_H
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#ifdef FRAC_BITS
#   define MULL(ra, rb) \
        ({ int rt, dummy; asm (\
            "imull %3               \n\t"\
            "shrdl %4, %%edx, %%eax \n\t"\
            : "=a"(rt), "=d"(dummy)\
            : "a" (ra), "rm" (rb), "i"(FRAC_BITS));\
         rt; })
#endif

#define MULH(ra, rb) \
    ({ int rt, dummy;\
     asm ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" (ra), "rm" (rb));\
     rt; })

#define MUL64(ra, rb) \
    ({ int64_t rt;\
     asm ("imull %2\n\t" : "=A"(rt) : "a" (ra), "g" (rb));\
     rt; })

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#endif /* FFMPEG_I386_MATHOPS_H */