[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: 18. Language Support
Affects Versions: 4.2.1
Environment: MSVC
Reporter: Farid Zaripov
Priority: Trivial
Fix For: 4.2.2
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.
--
This message is automatically generated by JIRA.
-
You can reply to this email to add a comment to the issue online.
