/* Implement frexp for m68k.

   Copyright (C) 1996-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library.  If not, see

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

#include <math.h>

FLOAT

M_DECL_FUNC (__frexp) (FLOAT value, int *expptr)

{

  FLOAT mantissa, exponent;

  int iexponent;

  unsigned long fpsr;

  __asm ("ftst%.x %1\n"

	 "fmove%.l %/fpsr, %0"

	 : "=dm" (fpsr) : "f" (value));

  if (fpsr & (7 << 24))

    {

      /* Not finite or zero.  */

      *expptr = 0;

      return value;

    }

  __asm ("fgetexp%.x %1, %0" : "=f" (exponent) : "f" (value));

  iexponent = (int) exponent + 1;

  *expptr = iexponent;

  __asm ("fscale%.l %2, %0"

	 : "=f" (mantissa)

	 : "0" (value), "dmi" (-iexponent));

  return mantissa;

}

declare_mgen_alias (__frexp, frexp)