From 3fe5402dfa4b16fe586baee9c6f7187c3a00268d Mon Sep 17 00:00:00 2001
From: nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Wed, 2 Sep 2009 07:50:16 +0000
Subject: * 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
---
 test/ruby/test_math.rb | 11 +++++++++++
 1 file changed, 11 insertions(+)

(limited to 'test')

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
-- 
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