arch/mn10300/lib/negdi2.c

   1 /* More subroutines needed by GCC output code on some machines.  */
   2 /* Compile this one with gcc.  */
   3 /* Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
   4    2000, 2001  Free Software Foundation, Inc.
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public Licence as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 In addition to the permissions in the GNU General Public Licence, the
  14 Free Software Foundation gives you unlimited permission to link the
  15 compiled version of this file into combinations with other programs,
  16 and to distribute those combinations without any restriction coming
  17 from the use of this file.  (The General Public Licence restrictions
  18 do apply in other respects; for example, they cover modification of
  19 the file, and distribution when not linked into a combine
  20 executable.)
  21
  22 GNU CC is distributed in the hope that it will be useful,
  23 but WITHOUT ANY WARRANTY; without even the implied warranty of
  24 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  25 GNU General Public Licence for more details.
  26
  27 You should have received a copy of the GNU General Public Licence
  28 along with GNU CC; see the file COPYING.  If not, write to
  29 the Free Software Foundation, 59 Temple Place - Suite 330,
  30 Boston, MA 02111-1307, USA.  */
  31
  32 /* It is incorrect to include config.h here, because this file is being
  33    compiled for the target, and hence definitions concerning only the host
  34    do not apply.  */
  35
  36 #include <linux/types.h>
  37
  38 union DWunion {
  39         s64 ll;
  40         struct {
  41                 s32 low;
  42                 s32 high;
  43         } s;
  44 };
  45
  46 s64 __negdi2(s64 u)
  47 {
  48         union DWunion w;
  49         union DWunion uu;
  50
  51         uu.ll = u;
  52
  53         w.s.low = -uu.s.low;
  54         w.s.high = -uu.s.high - ((u32) w.s.low > 0);
  55
  56         return w.ll;
  57 }