INFINITY config test outputs the different _RWSTD_LDBL_SNAN_BITS values per
different runs
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Key: STDCXX-740
URL: https://issues.apache.org/jira/browse/STDCXX-740
Project: C++ Standard Library
Issue Type: Improvement
Components: Configuration
Affects Versions: 4.2.0, 4.1.4, 4.1.3, 4.1.2
Environment: gcc/Linux/i386
Reporter: Farid Zaripov
Priority: Trivial
When I ran the INFINITY config test several times I found that the
_RWSTD_LDBL_SNAN_BITS values are different from time to time.
Below is the result of 5 runs of the INFINITY test:
{noformat}
#define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
'\x7f', '\xf9', '\xbf' }
#define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
'\x7f', '\xfd', '\xbf' }
#define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
'\x7f', '\xf7', '\xbf' }
#define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
'\x7f', '\xf2', '\xbf' }
#define _RWSTD_LDBL_SNAN_BITS { '\x1', 0, 0, 0, 0, 0, 0, '\x80', '\xff',
'\x7f', '\xe8', '\xbf' }
{noformat}
I suppose that actually used 80 bits from 96 bits of long double (sizeof (long
double) == 12) and the latest two bytes contains the garbage from stack.
I think we need fill by zero values the bits fields of the flt_bits, dbl_bits
and ldbl_bits unions (i.e. in union ctor).
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