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https://issues.apache.org/jira/browse/STDCXX-819?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Martin Sebor updated STDCXX-819:
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Summary: [MSVC] numeric_limits::quiet_NaN() and signaling_NaN() bits differ
from native STL (was: [_MSC_VER] Binary representation of the
numeric_limits<>::quiet_NaN() and numeric_limits<>::signaling_NaN() is
different from binary representation in native STL)
Replaced [_MSC_VER] tag with [MSVC] in Summary for consistency with other MSVC
issues and abbreviated the rest of the text to make it more easily readable in
reports.
> [MSVC] numeric_limits::quiet_NaN() and signaling_NaN() bits differ from
> native STL
> ----------------------------------------------------------------------------------
>
> Key: STDCXX-819
> URL: https://issues.apache.org/jira/browse/STDCXX-819
> Project: C++ Standard Library
> Issue Type: Bug
> Components: 26. Numerics
> Affects Versions: 4.1.2, 4.1.3, 4.1.4, 4.2.0
> Environment: MSVC and ICC/Windows
> Reporter: Farid Zaripov
> Fix For: 4.2.1
>
>
> The binary representation of NAN's in stdcxx:
> {noformat}
> #define _RWSTD_FLT_QNAN_BITS { 0, 0, '\xc0', '\xff' }
> #define _RWSTD_FLT_SNAN_BITS { '\x1', 0, '\x80', '\x7f' }
> #define _RWSTD_DBL_QNAN_BITS { 0, 0, 0, 0, 0, 0, '\xf8', '\xff' }
> #define _RWSTD_DBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, '\xf0', '\x7f' }
> #define _RWSTD_LDBL_QNAN_BITS { 0, 0, 0, 0, 0, 0, '\xf8', '\xff' }
> #define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, '\xf0', '\x7f' }
> {noformat}
> The binary representation of the same things in MSVC STL:
> {noformat}
> #define _RWSTD_FLT_QNAN_BITS { 0, 0, '\xc0', '\x7f' }
> #define _RWSTD_FLT_SNAN_BITS { '\x1', 0, '\xc0', '\x7f' }
> #define _RWSTD_DBL_QNAN_BITS { 0, 0, 0, 0, 0, 0, '\xf8', '\x7f' }
> #define _RWSTD_DBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, '\xf8', '\x7f' }
> #define _RWSTD_LDBL_QNAN_BITS { 0, 0, 0, 0, 0, 0, '\xf8', '\x7f' }
> #define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, '\xf8', '\x7f' }
> {noformat}
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