[Bug math/15319] New: Missing underflow exceptions from atan / atan2

["jsm28 at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=15319

             Bug #: 15319
           Summary: Missing underflow exceptions from atan / atan2
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
        AssignedTo: unassigned@sourceware.org
        ReportedBy: jsm28@gcc.gnu.org
    Classification: Unclassified


Various implementations of atan and atan2 functions fail to raise underflow
exceptions for subnormal arguments (when the result is very close to an input
subnormal, but inexact so should raise underflow).  For example, on x86_64,
atan2f (0x1.fp-129f, 1.0f) returns the correct result 0x1.fp-129f but fails to
raise an underflow exception.

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