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      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