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Neither the asm() nor the __asm__() keyword is part of the C99 standard, but while GCC accepts the former in C89 syntax, it is not accepted in C99 unless GNU extensions are turned on (with -fasm). The latter form is accepted in any syntax as an extension (without requiring further command-line options). Sun Studio C99 compiler also does not accept asm() while accepting __asm__(), albeit reporting warnings that it's not valid C99 syntax. Originally committed as revision 15627 to svn://svn.ffmpeg.org/ffmpeg/trunk
46 lines
1.5 KiB
C
46 lines
1.5 KiB
C
/*
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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_I386_MATHOPS_H
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#define AVCODEC_I386_MATHOPS_H
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#ifdef FRAC_BITS
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# define MULL(ra, rb) \
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({ int rt, dummy; __asm__ (\
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"imull %3 \n\t"\
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"shrdl %4, %%edx, %%eax \n\t"\
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: "=a"(rt), "=d"(dummy)\
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: "a" ((int)ra), "rm" ((int)rb), "i"(FRAC_BITS));\
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rt; })
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#endif
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#define MULH(ra, rb) \
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({ int rt, dummy;\
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__asm__ ("imull %3\n\t" : "=d"(rt), "=a"(dummy): "a" ((int)ra), "rm" ((int)rb));\
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rt; })
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#define MUL64(ra, rb) \
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({ int64_t rt;\
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__asm__ ("imull %2\n\t" : "=A"(rt) : "a" ((int)ra), "g" ((int)rb));\
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rt; })
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#endif /* AVCODEC_I386_MATHOPS_H */
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