lib/cmpdi2.c

   1 /*
   2  * This program is free software; you can redistribute it and/or modify
   3  * it under the terms of the GNU General Public License as published by
   4  * the Free Software Foundation; either version 2 of the License, or
   5  * (at your option) any later version.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  * You should have received a copy of the GNU General Public License
  13  * along with this program; if not, see the file COPYING, or write
  14  * to the Free Software Foundation, Inc.
  15  */
  16
  17 #include <linux/export.h>
  18
  19 #include <linux/libgcc.h>
  20
  21 word_type notrace __cmpdi2(long long a, long long b)
  22 {
  23         const DWunion au = {
  24                 .ll = a
  25         };
  26         const DWunion bu = {
  27                 .ll = b
  28         };
  29
  30         if (au.s.high < bu.s.high)
  31                 return 0;
  32         else if (au.s.high > bu.s.high)
  33                 return 2;
  34
  35         if ((unsigned int) au.s.low < (unsigned int) bu.s.low)
  36                 return 0;
  37         else if ((unsigned int) au.s.low > (unsigned int) bu.s.low)
  38                 return 2;
  39
  40         return 1;
  41 }
  42 EXPORT_SYMBOL(__cmpdi2);