diff options
Diffstat (limited to 'Lib/test/test_capi/test_float.py')
| -rw-r--r-- | Lib/test/test_capi/test_float.py | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/Lib/test/test_capi/test_float.py b/Lib/test/test_capi/test_float.py index c857959d569..f7efe0d0254 100644 --- a/Lib/test/test_capi/test_float.py +++ b/Lib/test/test_capi/test_float.py @@ -183,31 +183,35 @@ class CAPIFloatTest(unittest.TestCase): def test_pack_unpack_roundtrip_for_nans(self): pack = _testcapi.float_pack unpack = _testcapi.float_unpack - for _ in range(1000): + + for _ in range(10): for size in (2, 4, 8): sign = random.randint(0, 1) - signaling = random.randint(0, 1) + if sys.maxsize != 2147483647: # not it 32-bit mode + signaling = random.randint(0, 1) + else: + # Skip sNaN's on x86 (32-bit). The problem is that sNaN + # doubles become qNaN doubles just by the C calling + # convention, there is no way to preserve sNaN doubles + # between C function calls with the current + # PyFloat_Pack/Unpack*() API. See also gh-130317 and + # e.g. https://developercommunity.visualstudio.com/t/155064 + signaling = 0 quiet = int(not signaling) if size == 8: - payload = random.randint(signaling, 1 << 50) + payload = random.randint(signaling, 0x7ffffffffffff) i = (sign << 63) + (0x7ff << 52) + (quiet << 51) + payload elif size == 4: - payload = random.randint(signaling, 1 << 21) + payload = random.randint(signaling, 0x3fffff) i = (sign << 31) + (0xff << 23) + (quiet << 22) + payload elif size == 2: - payload = random.randint(signaling, 1 << 8) + payload = random.randint(signaling, 0x1ff) i = (sign << 15) + (0x1f << 10) + (quiet << 9) + payload data = bytes.fromhex(f'{i:x}') for endian in (BIG_ENDIAN, LITTLE_ENDIAN): with self.subTest(data=data, size=size, endian=endian): data1 = data if endian == BIG_ENDIAN else data[::-1] value = unpack(data1, endian) - if signaling and sys.platform == 'win32': - # On this platform sNaN becomes qNaN when returned - # from function. That's a known bug, e.g. - # https://developercommunity.visualstudio.com/t/155064 - # (see also gh-130317). - value = _testcapi.float_set_snan(value) data2 = pack(size, value, endian) self.assertTrue(math.isnan(value)) self.assertEqual(data1, data2) |