Fix float.from_hex tests. It appears that Linux/ia64 doesn't like

computing 2.0**-1074 accurately.  Using ldexp(1.0, -1074) should be
safer.

diff --git a/Lib/test/test_float.py b/Lib/test/test_float.py
index 254dd37fad4e657c89fcbbe960914256599f7e68..3f4998d4a4a3b1da1a9da3c55e0c9bba25baaa66 100644 (file)
--- a/Lib/test/test_float.py
+++ b/Lib/test/test_float.py
@@ -362,10 +362,10 @@ class HexFloatTestCase(unittest.TestCase):
         self.fail('%r not identical to %r' % (x, y))
 
     def test_ends(self):
-        self.identical(self.MIN, 2.**-1022)
-        self.identical(self.TINY, 2.**-1074)
-        self.identical(self.EPS, 2.**-52)
-        self.identical(self.MAX, 2.*(2.**1023 - 2.**970))
+        self.identical(self.MIN, ldexp(1.0, -1022))
+        self.identical(self.TINY, ldexp(1.0, -1074))
+        self.identical(self.EPS, ldexp(1.0, -52))
+        self.identical(self.MAX, 2.*(ldexp(1.0, 1023) - ldexp(1.0, 970)))
 
     def test_invalid_inputs(self):
         invalid_inputs = [