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Diffstat (limited to 'mpc/src/mul_fr.c')
-rw-r--r-- | mpc/src/mul_fr.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/mpc/src/mul_fr.c b/mpc/src/mul_fr.c new file mode 100644 index 0000000000..bd3574d857 --- /dev/null +++ b/mpc/src/mul_fr.c @@ -0,0 +1,43 @@ +/* mpc_mul_fr -- Multiply a complex number by a floating-point number. + +Copyright (C) 2002, 2008, 2009, 2010, 2011 INRIA + +This file is part of GNU MPC. + +GNU MPC 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. + +GNU MPC 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 this program. If not, see http://www.gnu.org/licenses/ . +*/ + +#include "mpc-impl.h" + +int +mpc_mul_fr (mpc_ptr a, mpc_srcptr b, mpfr_srcptr c, mpc_rnd_t rnd) +{ + int inex_re, inex_im; + mpfr_t real; + + if (c == mpc_realref (a)) + /* We have to use a temporary variable. */ + mpfr_init2 (real, MPC_PREC_RE (a)); + else + real [0] = mpc_realref (a) [0]; + + inex_re = mpfr_mul (real, mpc_realref(b), c, MPC_RND_RE(rnd)); + inex_im = mpfr_mul (mpc_imagref(a), mpc_imagref(b), c, MPC_RND_IM(rnd)); + mpfr_set (mpc_realref (a), real, GMP_RNDN); /* exact */ + + if (c == mpc_realref (a)) + mpfr_clear (real); + + return MPC_INEX(inex_re, inex_im); +} |