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[3.14] gh-132876: workaround broken ldexp() on Windows 10 (GH-133135) (#134684)

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gh-132876: workaround broken ldexp() on Windows 10 (GH-133135)

* gh-132876: workaround broken ldexp() on Windows 10

ldexp() fails to round subnormal results before Windows 11,
so hide their bug.
(cherry picked from commit cf8941c603)

Co-authored-by: Sergey B Kirpichev <skirpichev@gmail.com>
Co-authored-by: Tim Peters <tim.peters@gmail.com>
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Miss Islington (bot) 2025-05-26 05:23:45 +02:00 • committed by GitHub
parent 7216f7b59c
commit 16187b58bf
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6
Lib/test/test_math.py
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@ -1214,6 +1214,12 @@ class MathTests(unittest.TestCase):
self.assertEqual(math.ldexp(NINF, n), NINF)
self.assertTrue(math.isnan(math.ldexp(NAN, n)))
@requires_IEEE_754
def testLdexp_denormal(self):
# Denormal output incorrectly rounded (truncated)
# on some Windows.
self.assertEqual(math.ldexp(6993274598585239, -1126), 1e-323)
def testLog(self):
self.assertRaises(TypeError, math.log)
self.assertRaises(TypeError, math.log, 1, 2, 3)