negdi2.c

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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
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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
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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;
}