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FFmpeg/libavcodec/i386/mathops.h
Måns Rullgård 4deaa94639 Add shift argument to MULL() macro
This replaces use of FRAC_BITS in the MULL() definition with a third
argument specifying the shift amount.  All uses of this macro are
updated to pass FRAC_BITS as third argument.

Originally committed as revision 15921 to svn://svn.ffmpeg.org/ffmpeg/trunk
2008-11-24 09:28:55 +00:00

44 lines
1.5 KiB
C

/*
* simple math operations
* Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
*
* 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_I386_MATHOPS_H
#define AVCODEC_I386_MATHOPS_H
#define MULL(ra, rb, shift) \
({ int rt, dummy; __asm__ (\
"imull %3 \n\t"\
"shrdl %4, %%edx, %%eax \n\t"\
: "=a"(rt), "=d"(dummy)\
: "a" ((int)ra), "rm" ((int)rb), "i"(shift));\
rt; })
#define MULH(ra, rb) \
({ int rt, dummy;\
__asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)ra), "rm" ((int)rb));\
rt; })
#define MUL64(ra, rb) \
({ int64_t rt;\
__asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)ra), "g" ((int)rb));\
rt; })
#endif /* AVCODEC_I386_MATHOPS_H */