49 lines
1.3 KiB
C
49 lines
1.3 KiB
C
/* _mulsi3 for Lattice Mico32.
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Contributed by Jon Beniston <jon@beniston.com>
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Copyright (C) 2009-2016 Free Software Foundation, Inc.
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This file is free software; you can redistribute it and/or modify it
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under the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 3, or (at your option) any
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later version.
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This file is distributed in the hope that it will be useful, but
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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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General Public License for more details.
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Under Section 7 of GPL version 3, you are granted additional
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permissions described in the GCC Runtime Library Exception, version
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3.1, as published by the Free Software Foundation.
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You should have received a copy of the GNU General Public License and
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a copy of the GCC Runtime Library Exception along with this program;
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see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#include "libgcc_lm32.h"
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/* Integer multiplication. */
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USItype
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__mulsi3 (USItype a, USItype b)
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{
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USItype result;
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result = 0;
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if (a == 0)
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return 0;
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while (b != 0)
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{
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if (b & 1)
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result += a;
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a <<= 1;
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b >>= 1;
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}
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return result;
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}
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