CooCenter-System-kernel/arch/mn10300/lib/negdi2.c

/* 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
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GNU CC is distributed in the hope that it will be useful,
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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/* 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;
}