exp

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43816 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

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+Sat Nov 23 19:46:00 2013  Kenta Murata  <mrkn@mrkn.jp>
+
+	* ext/bigdecimal/bigdecimal.c (BigMath_s_exp): Optimize the
+	  calculation algorithm to reduce the number of divisions.
+	  This optimization was proposed by Rafał Michalski.
+	  [Feature #6857] [ruby-core:47130]
+
 Sat Nov 23 19:20:00 2013  Kenta Murata  <mrkn@mrkn.jp>
 
 	* ext/bigdecimal/bigdecimal.c (BigDecimal_div2): The signature was