[Bug math/887] New: Math library function "logb" and "nextafter" inconsistent

["uttamp at us dot ibm dot com" <sourceware-bugzilla at sources dot redhat dot com>]

Math library function logb give different result for some input values when 
   rounding mode "towards -ve infinity" is set and not set. Values for which I 
   got miscompare are "0X3FF0000000000000", "0X3FF8000000000000", 
   "0X3FF2000000000000", "0X3FFFFFFFFFFFFFFF", "0X3FF7FFFFFFFFFFFF" and 
   "0X3FF1FFFFFFFFFFFF".

Values obtained when rounding mode "towards -ve infinity" for all above input 
values-
                    "0x8000000000000000"
Values obtained when no rounding mode is set for all above input values-
                     "0x0000000000000000"


Similar problem i have seen with function nextafter - when rounding mode is set
it gives some value and when it is not set gives some value.

-- 
           Summary: Math library function "logb" and "nextafter"
                    inconsistent
           Product: glibc
           Version: 2.3.3
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: uttamp at us dot ibm dot com
        ReportedBy: uttamp at us dot ibm dot com
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: PowerPC (ppc64)
  GCC host triplet: PowerPC (ppc64)
GCC target triplet: PowerPC (ppc64)


http://sources.redhat.com/bugzilla/show_bug.cgi?id=887

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