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+Thu Sep 24 02:08:35 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* ext/bigdecimal/lib/bigdecimal/math.rb (atan): reduce loop with
+	  the formula of the double corner.  based on a patch from
+	  Masahiro Kanai (CanI) in [ruby-dev:39367].
+
 Thu Sep 24 01:14:18 2009  Yutaka Kanemoto  <kanemoto@ruby-lang.org>
 
 	* dln.c (aix_loaderror): fixed typo. suppress warnings.