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lshrdi3.c

/* lshrdi3.c extracted from gcc-2.7.2/libgcc2.c which is: */
/* Copyright (C) 1989, 1992, 1993, 1994, 1995 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.

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.  */

#define BITS_PER_UNIT 8

typedef      int SItype __attribute__((mode(SI)));
typedef unsigned int USItype  __attribute__((mode(SI)));
typedef            int DItype __attribute__((mode(DI)));
typedef            int word_type    __attribute__((mode(__word__)));

struct DIstruct {
      SItype      low;
      SItype      high;
};

union DIunion {
      struct DIstruct   s;
      DItype            ll;
};

DItype __lshrdi3(DItype u, word_type b)
{
      union DIunion w;
      word_type bm;
      union DIunion uu;

      if (b == 0)
            return u;

      uu.ll = u;

      bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
      if (bm <= 0) {
            w.s.high = 0;
            w.s.low = (USItype) uu.s.high >> -bm;
      } else {
            USItype carries = (USItype) uu.s.high << bm;
            w.s.high = (USItype) uu.s.high >> b;
            w.s.low = ((USItype) uu.s.low >> b) | carries;
      }

      return w.ll;
}

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