mrkn	2013-11-22 16:52:17 +0900 (Fri, 22 Nov 2013)

  New Revision: 43796

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=rev&revision=43796

  Log:
    * ext/bigdecimal/bigdecimal.c (BigDecimal_power): Round the result value.
      [Bug #8818] [ruby-core:56802]
    
    * test/bigdecimal/test_bigdecimal.rb: Add a test for the above fix.

  Modified files:
    trunk/ChangeLog
    trunk/ext/bigdecimal/bigdecimal.c
    trunk/test/bigdecimal/test_bigdecimal.rb
Index: ChangeLog
===================================================================
--- ChangeLog	(revision 43795)
+++ ChangeLog	(revision 43796)
@@ -1,3 +1,10 @@ https://github.com/ruby/ruby/blob/trunk/ChangeLog#L1
+Fri Nov 22 16:49:00 2013  Kenta Murata  <mrkn@m...>
+
+	* ext/bigdecimal/bigdecimal.c (BigDecimal_power): Round the result value.
+	  [Bug #8818] [ruby-core:56802]
+
+	* test/bigdecimal/test_bigdecimal.rb: Add a test for the above fix.
+
 Fri Nov 22 16:25:43 2013  Koichi Sasada  <ko1@a...>
 
 	* gc.c (heap_set_increment): accept minumum additional page number.
Index: ext/bigdecimal/bigdecimal.c
===================================================================
--- ext/bigdecimal/bigdecimal.c	(revision 43795)
+++ ext/bigdecimal/bigdecimal.c	(revision 43796)
@@ -2381,6 +2381,9 @@ retry: https://github.com/ruby/ruby/blob/trunk/ext/bigdecimal/bigdecimal.c#L2381
 	GUARD_OBJ(y, VpCreateRbObject(1, "0"));
     }
     VpPower(y, x, int_exp);
+    if (VpIsDef(y)) {
+	VpMidRound(y, VpGetRoundMode(), n);
+    }
     return ToValue(y);
 }
 
Index: test/bigdecimal/test_bigdecimal.rb
===================================================================
--- test/bigdecimal/test_bigdecimal.rb	(revision 43795)
+++ test/bigdecimal/test_bigdecimal.rb	(revision 43796)
@@ -1123,6 +1123,9 @@ class TestBigDecimal < Test::Unit::TestC https://github.com/ruby/ruby/blob/trunk/test/bigdecimal/test_bigdecimal.rb#L1123
     e   = BigDecimal("2.71828182845904523536028747135266249775724709369996")
     pow = BigDecimal("22.459157718361045473")
     assert_equal(pow, pi.power(e, 20))
+
+    b = BigDecimal('1.034482758620689655172413793103448275862068965517241379310344827586206896551724')
+    assert_equal(BigDecimal('0.114523E1'), b.power(4, 5), '[Bug #8818] [ruby-core:56802]')
   end
 
   def test_limit

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