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/* Definitions of target machine for GNU compiler, for IBM S/390

   Copyright (C) 1999, 2000, 2001, 2007, 2008 and 2009

   Free Software Foundation, Inc.

   Contributed by Hartmut Penner (hpenner@de.ibm.com) and

                  Ulrich Weigand (uweigand@de.ibm.com).

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under

the terms of the GNU General Public License as published by the Free

Software Foundation; either version 3, or (at your option) any later

version.

GCC 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 License

for more details.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#define EXPD(fp)        (((fp.l.upper) >> 20) & 0x7FF)

#define EXCESSD         1022

#define SIGNBIT         0x80000000

#define SIGND(fp)       ((fp.l.upper) & SIGNBIT)

#define MANTD_LL(fp)    ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)

#define FRACD_LL(fp)    (fp.ll & (HIDDEND_LL-1))

#define HIDDEND_LL      ((UDItype_x)1 << 52)

typedef int DItype_x __attribute__ ((mode (DI)));

typedef unsigned int UDItype_x __attribute__ ((mode (DI)));

typedef int SItype_x __attribute__ ((mode (SI)));

typedef unsigned int USItype_x __attribute__ ((mode (SI)));

union double_long {

    double d;

    struct {

      SItype_x upper;

      USItype_x lower;

    } l;

    UDItype_x ll;

};

DItype_x __fixdfdi (double a1);

/* convert double to int */

DItype_x

__fixdfdi (double a1)

{

    register union double_long dl1;

    register int exp;

    register DItype_x l;

    dl1.d = a1;

    /* +/- 0, denormalized */

    if (!EXPD (dl1))

      return 0;

    exp = EXPD (dl1) - EXCESSD - 53;

    /* number < 1 */

    if (exp < -53)

      return 0;

    /* NaN */

    if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */

      return 0x8000000000000000ULL;

    /* Number big number & +/- inf */

    if (exp >= 11) {

        l = (long long)1<<63;

        if (!SIGND(dl1))

            l--;

        return l;

    }

    l = MANTD_LL(dl1);

    /* shift down until exp < 12 or l = 0 */

    if (exp > 0)

      l <<= exp;

    else

      l >>= -exp;

    return (SIGND (dl1) ? -l : l);

}