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40 lines
1.3 KiB
C
40 lines
1.3 KiB
C
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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 library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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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#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" (ra), "rm" (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" (ra), "rm" (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" (ra), "g" (rb));\
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rt; })
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