1 /* mpc_mul_fr -- Multiply a complex number by a floating-point number.
2
3 Copyright (C) 2002, 2008, 2009, 2010, 2011, 2012 INRIA
4
5 This file is part of GNU MPC.
6
7 GNU MPC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU Lesser General Public License as published by the
9 Free Software Foundation; either version 3 of the License, or (at your
10 option) any later version.
11
12 GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
14 FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
15 more details.
16
17 You should have received a copy of the GNU Lesser General Public License
18 along with this program. If not, see http://www.gnu.org/licenses/ .
19 */
20
21 #include "mpc-impl.h"
22
23 int
mpc_mul_fr(mpc_ptr a,mpc_srcptr b,mpfr_srcptr c,mpc_rnd_t rnd)24 mpc_mul_fr (mpc_ptr a, mpc_srcptr b, mpfr_srcptr c, mpc_rnd_t rnd)
25 {
26 int inex_re, inex_im;
27 mpfr_t real;
28
29 if (c == mpc_realref (a))
30 /* We have to use a temporary variable. */
31 mpfr_init2 (real, MPC_PREC_RE (a));
32 else
33 real [0] = mpc_realref (a) [0];
34
35 inex_re = mpfr_mul (real, mpc_realref(b), c, MPC_RND_RE(rnd));
36 inex_im = mpfr_mul (mpc_imagref(a), mpc_imagref(b), c, MPC_RND_IM(rnd));
37 mpfr_set (mpc_realref (a), real, MPFR_RNDN); /* exact */
38
39 if (c == mpc_realref (a))
40 mpfr_clear (real);
41
42 return MPC_INEX(inex_re, inex_im);
43 }
44