Mark Dickinson added the comment:
Failures on the Windows buildbot
(http://buildbot.python.org/all/builders/AMD64%20Windows8.1%20Non-Debug%203.x/builds/238/steps/test/logs/stdio)
shown below.
It looks as though Windows is emulating the FMA operation on this machine (and
not doing a particularly good job of it). That means that if we want to support
Windows (and we do), we may have to emulate ourselves, preferably using
something a bit more efficient than the fractions.Fraction module.
I'll let the buildbots complete, to see what else fails, and then roll back the
commit. The patch clearly isn't good enough in its current state.
======================================================================
ERROR: test_fma_overflow (test.test_math.FMATests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "D:\buildarea\3.x.ware-win81-release\build\lib\test\test_math.py", line
1565, in test_fma_overflow
self.assertEqual(math.fma(a, b, -c),
OverflowError: overflow in fma
======================================================================
FAIL: test_fma_zero_result (test.test_math.FMATests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "D:\buildarea\3.x.ware-win81-release\build\lib\test\test_math.py", line
1524, in test_fma_zero_result
self.assertIsNegativeZero(math.fma(tiny, -tiny, 0.0))
File "D:\buildarea\3.x.ware-win81-release\build\lib\test\test_math.py", line
1642, in assertIsNegativeZero
msg="Expected a negative zero, got {!r}".format(value)
AssertionError: False is not true : Expected a negative zero, got 0.0
======================================================================
FAIL: test_random (test.test_math.FMATests)
----------------------------------------------------------------------
Traceback (most recent call last):
File "D:\buildarea\3.x.ware-win81-release\build\lib\test\test_math.py", line
1623, in test_random
self.assertEqual(math.fma(a, b, c), expected)
AssertionError: 0.5506672157701096 != 0.5506672157701097
----------
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<http://bugs.python.org/issue29282>
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