Mercurial > hg > CbC > CbC_gcc

annotate libgcc/config/lm32/_mulsi3.c @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
parents
children 04ced10e8804
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rev   line source
55
77e2b8dfacca update it from 4.4.3 to 4.5.0
ryoma <e075725@ie.u-ryukyu.ac.jp>
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1 /* _mulsi3 for Lattice Mico32.
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2 Contributed by Jon Beniston <jon@beniston.com>
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3
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4 Copyright (C) 2009 Free Software Foundation, Inc.
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5
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6 This file is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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ryoma <e075725@ie.u-ryukyu.ac.jp>
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8 Free Software Foundation; either version 3, or (at your option) any
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9 later version.
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10
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11 This file is distributed in the hope that it will be useful, but
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12 WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 General Public License for more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 #include "libgcc_lm32.h"
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26
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27 /* Integer multiplication. */
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28
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29 USItype
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30 __mulsi3 (USItype a, USItype b)
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31 {
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32 USItype result;
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33
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34 result = 0;
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35
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36 if (a == 0)
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37 return 0;
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38
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39 while (b != 0)
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40 {
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41 if (b & 1)
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42 result += a;
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43 a <<= 1;
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44 b >>= 1;
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45 }
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46
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47 return result;
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48 }