obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
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1 files changed, 83 insertions, 0 deletions

diff --git a/libgfortran/m4/pow.m4 b/libgfortran/m4/pow.m4
new file mode 100644
index 000000000..3814f87fe
--- /dev/null
+++ b/libgfortran/m4/pow.m4
@@ -0,0 +1,83 @@
+`/* Support routines for the intrinsic power (**) operator.
+   Copyright 2004, 2007, 2009 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"'
+
+include(iparm.m4)dnl
+
+/* 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_'rtype_name`) && defined (HAVE_'atype_name`)'
+
+rtype_name `pow_'rtype_code`_'atype_code` ('rtype_name` a, 'atype_name` b);
+export_proto(pow_'rtype_code`_'atype_code`);
+
+'rtype_name`
+pow_'rtype_code`_'atype_code` ('rtype_name` a, 'atype_name` b)
+{
+  'rtype_name` pow, x;
+  'atype_name` n;
+  GFC_UINTEGER_'atype_kind` u;
+  
+  n = b;
+  x = a;
+  pow = 1;
+  if (n != 0)
+    {
+      if (n < 0)
+	{
+'ifelse(rtype_letter,i,`dnl
+	  if (x == 1)
+	    return 1;
+	  if (x == -1)
+	    return (n & 1) ? -1 : 1;
+	  return (x == 0) ? 1 / x : 0;
+',`
+	  u = -n;
+	  x = pow / x;
+')dnl
+`	}
+      else
+	{
+	   u = n;
+	}
+      for (;;)
+	{
+	  if (u & 1)
+	    pow *= x;
+	  u >>= 1;
+	  if (u)
+	    x *= x;
+	  else
+	    break;
+	}
+    }
+  return pow;
+}
+
+#endif'