The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/arch/score/lib/lshrdi3.c

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    1 /*
    2  * arch/score/lib/lshrdi3.c
    3  *
    4  * This program is free software; you can redistribute it and/or modify
    5  * it under the terms of the GNU General Public License as published by
    6  * the Free Software Foundation; either version 2 of the License, or
    7  * (at your option) any later version.
    8  *
    9  * This program is distributed in the hope that it will be useful,
   10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12  * GNU General Public License for more details.
   13  *
   14  * You should have received a copy of the GNU General Public License
   15  * along with this program; if not, see the file COPYING, or write
   16  * to the Free Software Foundation, Inc.,
   17  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
   18  */
   19 
   20 
   21 #include <linux/module.h>
   22 #include "libgcc.h"
   23 
   24 long long __lshrdi3(long long u, word_type b)
   25 {
   26         DWunion uu, w;
   27         word_type bm;
   28 
   29         if (b == 0)
   30                 return u;
   31 
   32         uu.ll = u;
   33         bm = 32 - b;
   34 
   35         if (bm <= 0) {
   36                 w.s.high = 0;
   37                 w.s.low = (unsigned int) uu.s.high >> -bm;
   38         } else {
   39                 const unsigned int carries = (unsigned int) uu.s.high << bm;
   40 
   41                 w.s.high = (unsigned int) uu.s.high >> b;
   42                 w.s.low = ((unsigned int) uu.s.low >> b) | carries;
   43         }
   44 
   45         return w.ll;
   46 }
   47 EXPORT_SYMBOL(__lshrdi3);

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