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81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/* mpc_mul_i -- Multiply a complex number by plus or minus i.
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Copyright (C) 2005, 2009, 2010, 2011, 2012 INRIA
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This file is part of GNU MPC.
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GNU MPC is free software; you can redistribute it and/or modify it under
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the terms of the GNU Lesser General Public License as published by the
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Free Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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GNU MPC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see http://www.gnu.org/licenses/ .
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*/
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#include "mpc-impl.h"
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int
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mpc_mul_i (mpc_ptr a, mpc_srcptr b, int sign, mpc_rnd_t rnd)
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/* if sign is >= 0, multiply by i, otherwise by -i */
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{
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int inex_re, inex_im;
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mpfr_t tmp;
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/* Treat the most probable case of compatible precisions first */
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if ( MPC_PREC_RE (b) == MPC_PREC_IM (a)
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&& MPC_PREC_IM (b) == MPC_PREC_RE (a))
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{
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if (a == b)
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mpfr_swap (mpc_realref (a), mpc_imagref (a));
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else
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{
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mpfr_set (mpc_realref (a), mpc_imagref (b), MPFR_RNDN);
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mpfr_set (mpc_imagref (a), mpc_realref (b), MPFR_RNDN);
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}
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if (sign >= 0)
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MPFR_CHANGE_SIGN (mpc_realref (a));
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else
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MPFR_CHANGE_SIGN (mpc_imagref (a));
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inex_re = 0;
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inex_im = 0;
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}
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else
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{
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if (a == b)
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{
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mpfr_init2 (tmp, MPC_PREC_RE (a));
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if (sign >= 0)
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{
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inex_re = mpfr_neg (tmp, mpc_imagref (b), MPC_RND_RE (rnd));
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inex_im = mpfr_set (mpc_imagref (a), mpc_realref (b), MPC_RND_IM (rnd));
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}
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else
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{
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inex_re = mpfr_set (tmp, mpc_imagref (b), MPC_RND_RE (rnd));
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inex_im = mpfr_neg (mpc_imagref (a), mpc_realref (b), MPC_RND_IM (rnd));
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}
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mpfr_clear (mpc_realref (a));
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mpc_realref (a)[0] = tmp [0];
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}
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else
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if (sign >= 0)
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{
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inex_re = mpfr_neg (mpc_realref (a), mpc_imagref (b), MPC_RND_RE (rnd));
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inex_im = mpfr_set (mpc_imagref (a), mpc_realref (b), MPC_RND_IM (rnd));
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}
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else
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{
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inex_re = mpfr_set (mpc_realref (a), mpc_imagref (b), MPC_RND_RE (rnd));
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inex_im = mpfr_neg (mpc_imagref (a), mpc_realref (b), MPC_RND_IM (rnd));
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}
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}
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return MPC_INEX(inex_re, inex_im);
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}
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