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Issue #2487. math.ldexp(x, n) raised OverflowError when n was large and

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negative; fix to return an (appropriately signed) zero instead.
This commit is contained in:
Mark Dickinson 2008-05-09 17:54:23 +00:00
parent 8bd5334a9e
commit f8476c1573
3 changed files with 78 additions and 13 deletions
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18
Lib/test/test_math.py
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@ -374,6 +374,24 @@ class MathTests(unittest.TestCase):
self.assertEquals(math.ldexp(NINF, -213), NINF)
self.assert_(math.isnan(math.ldexp(NAN, 0)))
# large second argument
for n in [10**5, 10L**5, 10**10, 10L**10, 10**20, 10**40]:
self.assertEquals(math.ldexp(INF, -n), INF)
self.assertEquals(math.ldexp(NINF, -n), NINF)
self.assertEquals(math.ldexp(1., -n), 0.)
self.assertEquals(math.ldexp(-1., -n), -0.)
self.assertEquals(math.ldexp(0., -n), 0.)
self.assertEquals(math.ldexp(-0., -n), -0.)
self.assert_(math.isnan(math.ldexp(NAN, -n)))
self.assertRaises(OverflowError, math.ldexp, 1., n)
self.assertRaises(OverflowError, math.ldexp, -1., n)
self.assertEquals(math.ldexp(0., n), 0.)
self.assertEquals(math.ldexp(-0., n), -0.)
self.assertEquals(math.ldexp(INF, n), INF)
self.assertEquals(math.ldexp(NINF, n), NINF)
self.assert_(math.isnan(math.ldexp(NAN, n)))
def testLog(self):
self.assertRaises(TypeError, math.log)
self.ftest('log(1/e)', math.log(1/math.e), -1)