/* mpc_pow_z -- Raise a complex number to an integer power.
Copyright (C) INRIA, 2009, 2010
This file is part of the MPC Library.
The MPC Library 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 2.1 of the License, or (at your
option) any later version.
The MPC Library 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 the MPC Library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#include "mpc-impl.h"
int
mpc_pow_z (mpc_ptr z, mpc_srcptr x, mpz_srcptr y, mpc_rnd_t rnd)
{
mpc_t yy;
int inex;
mpfr_prec_t n = (mpfr_prec_t) mpz_sizeinbase (y, 2);
/* if y fits in an unsigned long or long, call the corresponding functions,
which are supposed to be more efficient */
if (mpz_cmp_ui (y, 0ul) >= 0) {
if (mpz_fits_ulong_p (y))
return mpc_pow_usi (z, x, mpz_get_ui (y), 1, rnd);
}
else {
if (mpz_fits_slong_p (y))
return mpc_pow_usi (z, x, (unsigned long) (-mpz_get_si (y)), -1, rnd);
}
mpc_init3 (yy, (n < MPFR_PREC_MIN) ? MPFR_PREC_MIN : n, MPFR_PREC_MIN);
mpc_set_z (yy, y, MPC_RNDNN); /* exact */
inex = mpc_pow (z, x, yy, rnd);
mpc_clear (yy);
return inex;
}