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https://issues.apache.org/jira/browse/STDCXX-897?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Farid Zaripov closed STDCXX-897.
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> [MSVC] 18.numeric.special.float test fails
> ------------------------------------------
>
> Key: STDCXX-897
> URL: https://issues.apache.org/jira/browse/STDCXX-897
> Project: C++ Standard Library
> Issue Type: Bug
> Components: Tests
> Affects Versions: 4.2.1
> Environment: MSVC
> Reporter: Farid Zaripov
> Assignee: Farid Zaripov
> Priority: Trivial
> Fix For: 4.2.2
>
> Attachments: 18.numeric.special.float.cpp.diff
>
> Original Estimate: 1h
> Time Spent: 1h
> Remaining Estimate: 0h
>
> The 18.numeric.special.float test fails with the following assertions:
> {noformat}
> # ASSERTION (S7) (4 lines):
> # TEXT: _fpclass(numeric_limits<float>::signaling_NaN()) == 1
> (_FPCLASS_SNAN), got 2 (_FPCLASS_QNAN)
> # CLAUSE: numeric.special
> # LINE: 318
> # ASSERTION (S7) (4 lines):
> # TEXT: numeric_limits<float>::has_denorm == -1, got 1
> # CLAUSE: numeric.special
> # LINE: 1360
> # ASSERTION (S7) (4 lines):
> # TEXT: numeric_limits<double>::has_denorm == -1, got 1
> # CLAUSE: numeric.special
> # LINE: 1360
> # ASSERTION (S7) (4 lines):
> # TEXT: numeric_limits<long double>::has_denorm == -1, got 1
> # CLAUSE: numeric.special
> # LINE: 1360
> {noformat}
> The first assertions is caused due to MSVC provides _fpclass() function for
> double type only and X87 and SSE floating point commands are incorrect
> converting float signaling NaN value to double type. So for example the float
> signaling NaN value with bitmask 0x7F800001, calculated in INFINITY config
> test, is converted to double value with bitmask 0x7ff8000020000000, which is
> a quiet NaN value.
> The rest of the assertions are caused due to test expects, that
> numeric_limits<>::has_denorm == 1 on the _AIX, __hpux and __osf__ platforms
> only.
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