1 /* mpf_mul -- Multiply two floats.
3 Copyright (C) 1993, 1994, 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 mpf_mul (mpf_ptr r, mpf_srcptr u, mpf_srcptr v)
36 mp_size_t usize, vsize;
37 mp_size_t sign_product;
38 mp_size_t prec = r->_mp_prec;
44 sign_product = usize ^ vsize;
62 if (usize == 0 || vsize == 0)
65 r->_mp_exp = 0; /* ??? */
74 rsize = usize + vsize;
75 tp = (mp_ptr) TMP_ALLOC (rsize * BYTES_PER_MP_LIMB);
76 cy_limb = (usize >= vsize
77 ? mpn_mul (tp, up, usize, vp, vsize)
78 : mpn_mul (tp, vp, vsize, up, usize));
89 MPN_COPY (rp, tp, rsize);
90 r->_mp_exp = u->_mp_exp + v->_mp_exp - adj;
91 r->_mp_size = sign_product >= 0 ? rsize : -rsize;