Subversion Repositories openrisc_2011-10-31

/* 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 EXP(fp)         (((fp.l) >> 23) & 0xFF)

#define EXCESS          126

#define SIGNBIT         0x80000000

#define SIGN(fp)        ((fp.l) & SIGNBIT)

#define HIDDEN          (1 << 23)

#define MANT(fp)        (((fp.l) & 0x7FFFFF) | HIDDEN)

#define FRAC(fp)        ((fp.l) & 0x7FFFFF)

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 float_long

  {

    float f;

    USItype_x l;

  };

DItype_x __fixsfdi (float a1);

/* convert double to int */

DItype_x

__fixsfdi (float a1)

{

    register union float_long fl1;

    register int exp;

    register DItype_x l;

    fl1.f = a1;

    /* +/- 0, denormalized */

    if (!EXP (fl1))

      return 0;

    exp = EXP (fl1) - EXCESS - 24;

    /* number < 1 */

    if (exp < -24)

      return 0;

    /* NaN */

    if ((EXP(fl1) == 0xff) && (FRAC(fl1) != 0)) /* NaN */

      return 0x8000000000000000ULL;

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

    if (exp >= 40) {

        l = (long long)1<<63;

        if (!SIGN(fl1))

            l--;

        return l;

    }

    l = MANT(fl1);

    if (exp > 0)

      l <<= exp;

    else

      l >>= -exp;

    return (SIGN (fl1) ? -l : l);

}