1 files changed, 47 insertions, 0 deletions
diff --git a/mpc/src/pow_z.c b/mpc/src/pow_z.c
new file mode 100644
index 0000000000..22eb544ca9
--- /dev/null
+++ b/mpc/src/pow_z.c
@@ -0,0 +1,47 @@
+/* mpc_pow_z -- Raise a complex number to an integer power.
+
+Copyright (C) 2009, 2010 INRIA
+
+This file is part of GNU MPC.
+
+GNU MPC 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 3 of the License, or (at your
+option) any later version.
+
+GNU MPC 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 this program. If not, see http://www.gnu.org/licenses/ .
+*/
+
+#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;
+}
+