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/* mpc_pow_z -- Raise a complex number to an integer power.
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Copyright (C) 2009, 2010 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_pow_z (mpc_ptr z, mpc_srcptr x, mpz_srcptr y, mpc_rnd_t rnd)
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{
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mpc_t yy;
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int inex;
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mpfr_prec_t n = (mpfr_prec_t) mpz_sizeinbase (y, 2);
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/* if y fits in an unsigned long or long, call the corresponding functions,
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which are supposed to be more efficient */
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if (mpz_cmp_ui (y, 0ul) >= 0) {
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if (mpz_fits_ulong_p (y))
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return mpc_pow_usi (z, x, mpz_get_ui (y), 1, rnd);
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}
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else {
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if (mpz_fits_slong_p (y))
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return mpc_pow_usi (z, x, (unsigned long) (-mpz_get_si (y)), -1, rnd);
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}
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mpc_init3 (yy, (n < MPFR_PREC_MIN) ? MPFR_PREC_MIN : n, MPFR_PREC_MIN);
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mpc_set_z (yy, y, MPC_RNDNN); /* exact */
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inex = mpc_pow (z, x, yy, rnd);
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mpc_clear (yy);
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return inex;
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}
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