1 /* mpc_pow_z -- Raise a complex number to an integer power.
3 Copyright (C) 2009, 2010 INRIA
5 This file is part of GNU MPC.
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.
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
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/ .
24 mpc_pow_z (mpc_ptr z, mpc_srcptr x, mpz_srcptr y, mpc_rnd_t rnd)
28 mpfr_prec_t n = (mpfr_prec_t) mpz_sizeinbase (y, 2);
30 /* if y fits in an unsigned long or long, call the corresponding functions,
31 which are supposed to be more efficient */
32 if (mpz_cmp_ui (y, 0ul) >= 0) {
33 if (mpz_fits_ulong_p (y))
34 return mpc_pow_usi (z, x, mpz_get_ui (y), 1, rnd);
37 if (mpz_fits_slong_p (y))
38 return mpc_pow_usi (z, x, (unsigned long) (-mpz_get_si (y)), -1, rnd);
41 mpc_init3 (yy, (n < MPFR_PREC_MIN) ? MPFR_PREC_MIN : n, MPFR_PREC_MIN);
42 mpc_set_z (yy, y, MPC_RNDNN); /* exact */
43 inex = mpc_pow (z, x, yy, rnd);