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kernel/linux-imx6_3.14.28/arch/mn10300/lib/negdi2.c 1.78 KB
6b13f685e   김민수   BSP 최초 추가
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  /* More subroutines needed by GCC output code on some machines.  */
  /* Compile this one with gcc.  */
  /* Copyright (C) 1989, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
     2000, 2001  Free Software Foundation, Inc.
  
  This file is part of GNU CC.
  
  GNU CC is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public Licence as published by
  the Free Software Foundation; either version 2, or (at your option)
  any later version.
  
  In addition to the permissions in the GNU General Public Licence, the
  Free Software Foundation gives you unlimited permission to link the
  compiled version of this file into combinations with other programs,
  and to distribute those combinations without any restriction coming
  from the use of this file.  (The General Public Licence restrictions
  do apply in other respects; for example, they cover modification of
  the file, and distribution when not linked into a combine
  executable.)
  
  GNU CC is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public Licence for more details.
  
  You should have received a copy of the GNU General Public Licence
  along with GNU CC; see the file COPYING.  If not, write to
  the Free Software Foundation, 59 Temple Place - Suite 330,
  Boston, MA 02111-1307, USA.  */
  
  /* It is incorrect to include config.h here, because this file is being
     compiled for the target, and hence definitions concerning only the host
     do not apply.  */
  
  #include <linux/types.h>
  
  union DWunion {
  	s64 ll;
  	struct {
  		s32 low;
  		s32 high;
  	} s;
  };
  
  s64 __negdi2(s64 u)
  {
  	union DWunion w;
  	union DWunion uu;
  
  	uu.ll = u;
  
  	w.s.low = -uu.s.low;
  	w.s.high = -uu.s.high - ((u32) w.s.low > 0);
  
  	return w.ll;
  }