1 /* double mpz_get_d (mpz_t src) -- Return the double approximation to SRC.
3 Copyright (C) 1996 Free Software Foundation, Inc.
5 This file is part of the GNU MP Library.
7 The GNU MP Library is free software; you can redistribute it and/or modify
8 it under the terms of the GNU Library General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or (at your
10 option) any later version.
12 The GNU MP Library is distributed in the hope that it will be useful, but
13 WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
14 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public
15 License for more details.
17 You should have received a copy of the GNU Library General Public License
18 along with the GNU MP Library; see the file COPYING.LIB. If not, write to
19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
20 MA 02111-1307, USA. */
27 mpz_get_d (mpz_srcptr src)
34 mp_size_t size, i, n_limbs_to_use;
47 n_limbs_to_use = MIN (LIMBS_PER_DOUBLE, size);
48 for (i = 2; i <= n_limbs_to_use; i++)
49 res = res * MP_BASE_AS_DOUBLE + qp[size - i];
51 res = __gmp_scale2 (res, (size - n_limbs_to_use) * BITS_PER_MP_LIMB);
53 return negative ? -res : res;