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py/modmath: Work around msvc float bugs in atan2, fmod and modf.

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Older implementations deal with infinity/negative zero incorrectly.  This
commit adds generic fixes that can be enabled by any port that needs them,
along with new tests cases.
This commit is contained in:
stijn
2020-05-17 12:29:25 +02:00
committed by Damien George
parent a902b69dd5
commit 81db22f693
4 changed files with 51 additions and 3 deletions
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4
tests/float/math_domain.py
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@@ -39,8 +39,8 @@ for name, f, args in (
# double argument functions
for name, f, args in (
("pow", math.pow, ((0, 2), (-1, 2), (0, -1), (-1, 2.3))),
("fmod", math.fmod, ((1.2, inf), (1.2, 0), (inf, 1.2))),
("atan2", math.atan2, ((0, 0),)),
("fmod", math.fmod, ((1.2, inf), (1.2, -inf), (1.2, 0), (inf, 1.2))),
("atan2", math.atan2, ((0, 0), (-inf, inf), (-inf, -inf), (inf, -inf))),
("copysign", math.copysign, ()),
):
for x in args + ((0, inf), (inf, 0), (inf, inf), (inf, nan), (nan, inf), (nan, nan)):