Subversion Repositories openrisc_2011-10-31

/* flonum_copy.c - copy a flonum

   Copyright 1987, 1990, 1991, 1992, 1993, 2000, 2003, 2007

   Free Software Foundation, Inc.

   This file is part of GAS, the GNU Assembler.

   GAS 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.

   GAS 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.

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

   along with GAS; see the file COPYING.  If not, write to the Free

   Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA

   02110-1301, USA.  */

#include "as.h"

void

flonum_copy (FLONUM_TYPE *in, FLONUM_TYPE *out)

{

  unsigned int in_length;       /* 0 origin */

  unsigned int out_length;      /* 0 origin */

  out->sign = in->sign;

  in_length = in->leader - in->low;

  if (in->leader < in->low)

    {

      out->leader = out->low - 1;       /* 0.0 case */

    }

  else

    {

      out_length = out->high - out->low;

      /* Assume no GAPS in packing of littlenums.

         I.e. sizeof(array) == sizeof(element) * number_of_elements.  */

      if (in_length <= out_length)

        {

          {

            /* For defensive programming, zero any high-order

               littlenums we don't need.  This is destroying evidence

               and wasting time, so why bother???  */

            if (in_length < out_length)

              {

                memset ((char *) (out->low + in_length + 1), '\0',

                        out_length - in_length);

              }

          }

          memcpy ((void *) (out->low), (void *) (in->low),

                  ((in_length + 1) * sizeof (LITTLENUM_TYPE)));

          out->exponent = in->exponent;

          out->leader = in->leader - in->low + out->low;

        }

      else

        {

          int shorten;          /* 1-origin. Number of littlenums we drop.  */

          shorten = in_length - out_length;

          /* Assume out_length >= 0 ! */

          memcpy ((void *) (out->low), (void *) (in->low + shorten),

                  ((out_length + 1) * sizeof (LITTLENUM_TYPE)));

          out->leader = out->high;

          out->exponent = in->exponent + shorten;

        }

    }                           /* if any significant bits */

}