* math.c (math_gamma): get rid of direct comparison between too

  big double and integer, with gcc on x86_64.  [ruby-core:25257]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24738 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 11 insertions, 0 deletions

diff --git a/test/ruby/test_math.rb b/test/ruby/test_math.rb
index d4dbf9dbf0..c62466d33c 100644
--- a/test/ruby/test_math.rb
+++ b/test/ruby/test_math.rb
@@ -1,6 +1,10 @@
 require 'test/unit'
 
 class TestMath < Test::Unit::TestCase
+  def assert_infinity(a, *rest)
+    assert(!a.finite?, *rest)
+  end
+
   def check(a, b)
     err = [Float::EPSILON * 4, [a.abs, b.abs].max * Float::EPSILON * 256].max
     assert_in_delta(a, b, err)
@@ -189,6 +193,13 @@ class TestMath < Test::Unit::TestCase
     check(2, Math.gamma(3))
     check(15 * sqrt_pi / 8, Math.gamma(3.5))
     check(6, Math.gamma(4))
+
+    # no SEGV [ruby-core:25257]
+    31.upto(65) do |i|
+      i = 1 << i
+      assert_infinity(Math.gamma(i))
+      assert_infinity(Math.gamma(i-1))
+    end
   end
 
   def test_lgamma