* time.c (rb_big_abs_find_minbit): fix handling the last word.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27133 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

3 files changed, 7 insertions, 1 deletions

diff --git a/ChangeLog b/ChangeLog
index d7231176b9..017dbc1d93 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Apr  1 04:55:08 2010  Tanaka Akira  <akr@fsij.org>
+
+	* time.c (rb_big_abs_find_minbit): fix handling the last word.
+
 Thu Apr  1 04:30:11 2010  Tanaka Akira  <akr@fsij.org>
 
 	* time.c (long_mul): overflow condition changed.
diff --git a/test/ruby/test_time.rb b/test/ruby/test_time.rb
index 108fcdbc20..cb17f416ee 100644
--- a/test/ruby/test_time.rb
+++ b/test/ruby/test_time.rb
@@ -181,6 +181,8 @@ class TestTime < Test::Unit::TestCase
     assert_equal(-146138510344, t.year)
     t = Time.at(-0x5000_0000_0000_0001)
     assert_equal(-182673138422, t.year)
+    t = Time.at(-0x6000_0000_0000_0000)
+    assert_equal(-219207766501, t.year)
   end
 
   def test_at2
diff --git a/time.c b/time.c
index a3195e27a2..e36c33bdcb 100644
--- a/time.c
+++ b/time.c
@@ -343,7 +343,7 @@ rb_big_abs_find_minbit(VALUE big)
         return Qnil;
     res = mul(LONG2NUM(i), INT2FIX(SIZEOF_BDIGITS * CHAR_BIT));
     d = ds[i];
-    res = add(res, LONG2FIX(bdigit_find_maxbit(d)));
+    res = add(res, LONG2FIX(bdigit_find_maxbit(d & -d)));
     return res;
 }