* ext/bigdecimal/lib/bigdecimal/math.rb (BigMath.E): Use BigMath.exp.

  [Feature #6857] [ruby-core:47130]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43817 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 6 insertions, 14 deletions

diff --git a/ChangeLog b/ChangeLog
index 2323332883..cae760fb95 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Sat Nov 23 19:52:00 2013  Kenta Murata  <mrkn@mrkn.jp>
+
+	* ext/bigdecimal/lib/bigdecimal/math.rb (BigMath.E): Use BigMath.exp.
+	  [Feature #6857] [ruby-core:47130]
+
 Sat Nov 23 19:46:00 2013  Kenta Murata  <mrkn@mrkn.jp>
 
 	* ext/bigdecimal/bigdecimal.c (BigMath_s_exp): Optimize the
diff --git a/ext/bigdecimal/lib/bigdecimal/math.rb b/ext/bigdecimal/lib/bigdecimal/math.rb
index 4504ccb2b0..907d3b3829 100644
--- a/ext/bigdecimal/lib/bigdecimal/math.rb
+++ b/ext/bigdecimal/lib/bigdecimal/math.rb
@@ -226,19 +226,6 @@ module BigMath
   #
   def E(prec)
     raise ArgumentError, "Zero or negative precision for E" if prec <= 0
-    n    = prec + BigDecimal.double_fig
-    one  = BigDecimal("1")
-    y  = one
-    d  = y
-    z  = one
-    i  = 0
-    while d.nonzero? && ((m = n - (y.exponent - d.exponent).abs) > 0)
-      m = BigDecimal.double_fig if m < BigDecimal.double_fig
-      i += 1
-      z *= i
-      d  = one.div(z,m)
-      y += d
-    end
-    y
+    BigMath.exp(1, prec)
   end
 end