1 /* mpc_pow_z -- Raise a complex number to an integer power. 2 3 Copyright (C) 2009, 2010 INRIA 4 5 This file is part of GNU MPC. 6 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. 11 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 15 more details. 16 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/ . 19 */ 20 21 #include "mpc-impl.h" 22 23 int 24 mpc_pow_z (mpc_ptr z, mpc_srcptr x, mpz_srcptr y, mpc_rnd_t rnd) 25 { 26 mpc_t yy; 27 int inex; 28 mpfr_prec_t n = (mpfr_prec_t) mpz_sizeinbase (y, 2); 29 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); 35 } 36 else { 37 if (mpz_fits_slong_p (y)) 38 return mpc_pow_usi (z, x, (unsigned long) (-mpz_get_si (y)), -1, rnd); 39 } 40 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); 44 mpc_clear (yy); 45 return inex; 46 } 47 48