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From "Farid Zaripov (JIRA)" <j...@apache.org>
Subject [jira] Created: (STDCXX-819) [_MSC_VER] Binary representation of the numeric_limits<>::quiet_NaN() and numeric_limits<>::signaling_NaN() is different from binary representation in native STL
Date Tue, 01 Apr 2008 18:06:24 GMT
[_MSC_VER] Binary representation of the numeric_limits<>::quiet_NaN() and numeric_limits<>::signaling_NaN()
is different from binary representation in 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: 4.2.0, 4.1.4, 4.1.3, 4.1.2
         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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