xref: /dflybsd-src/contrib/gmp/mpf/iset_si.c (revision d365564473a20a528d07c59cad8ee2f4bea5546f)

/* mpf_init_set_si() -- Initialize a float and assign it from a signed int.

Copyright 1993, 1994, 1995, 2000, 2001, 2003, 2004 Free Software Foundation,
Inc.

This file is part of the GNU MP Library.

The GNU MP 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 3 of the License, or (at your
option) any later version.

The GNU MP 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 MP Library.  If not, see http://www.gnu.org/licenses/.  */

#include "gmp.h"
#include "gmp-impl.h"

void
mpf_init_set_si (mpf_ptr r, long int val)
{
  mp_size_t prec = __gmp_default_fp_limb_precision;
  mp_size_t size;
  mp_limb_t vl;

  r->_mp_prec = prec;
  r->_mp_d = (mp_ptr) (*__gmp_allocate_func) ((prec + 1) * BYTES_PER_MP_LIMB);

  vl = (mp_limb_t) ABS_CAST (unsigned long int, val);

  r->_mp_d[0] = vl & GMP_NUMB_MASK;
  size = vl != 0;

#if BITS_PER_ULONG > GMP_NUMB_BITS
  vl >>= GMP_NUMB_BITS;
  r->_mp_d[1] = vl;
  size += (vl != 0);
#endif

  r->_mp_exp = size;
  r->_mp_size = val >= 0 ? size : -size;
}