--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libgfortran/generated/pow_c4_i16.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,75 @@
+/* Support routines for the intrinsic power (**) operator.
+   Copyright (C) 2004-2017 Free Software Foundation, Inc.
+   Contributed by Paul Brook
+
+This file is part of the GNU Fortran 95 runtime library (libgfortran).
+
+Libgfortran is free software; you can redistribute it and/or
+modify it under the terms of the GNU General Public
+License as published by the Free Software Foundation; either
+version 3 of the License, or (at your option) any later version.
+
+Libgfortran 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 General Public License for more details.
+
+Under Section 7 of GPL version 3, you are granted additional
+permissions described in the GCC Runtime Library Exception, version
+3.1, as published by the Free Software Foundation.
+
+You should have received a copy of the GNU General Public License and
+a copy of the GCC Runtime Library Exception along with this program;
+see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+<http://www.gnu.org/licenses/>.  */
+
+#include "libgfortran.h"
+
+
+/* Use Binary Method to calculate the powi. This is not an optimal but
+   a simple and reasonable arithmetic. See section 4.6.3, "Evaluation of
+   Powers" of Donald E. Knuth, "Seminumerical Algorithms", Vol. 2, "The Art
+   of Computer Programming", 3rd Edition, 1998.  */
+
+#if defined (HAVE_GFC_COMPLEX_4) && defined (HAVE_GFC_INTEGER_16)
+
+GFC_COMPLEX_4 pow_c4_i16 (GFC_COMPLEX_4 a, GFC_INTEGER_16 b);
+export_proto(pow_c4_i16);
+
+GFC_COMPLEX_4
+pow_c4_i16 (GFC_COMPLEX_4 a, GFC_INTEGER_16 b)
+{
+  GFC_COMPLEX_4 pow, x;
+  GFC_INTEGER_16 n;
+  GFC_UINTEGER_16 u;
+  
+  n = b;
+  x = a;
+  pow = 1;
+  if (n != 0)
+    {
+      if (n < 0)
+	{
+
+	  u = -n;
+	  x = pow / x;
+	}
+      else
+	{
+	   u = n;
+	}
+      for (;;)
+	{
+	  if (u & 1)
+	    pow *= x;
+	  u >>= 1;
+	  if (u)
+	    x *= x;
+	  else
+	    break;
+	}
+    }
+  return pow;
+}
+
+#endif