[Bug math/16539] New: spurious underflow exception from expm1

["zimmerma+gcc at loria dot fr" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=16539

            Bug ID: 16539
           Summary: spurious underflow exception from expm1
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: math
          Assignee: unassigned at sourceware dot org
          Reporter: zimmerma+gcc at loria dot fr

this example (in extended precision) gives a spurious underflow:

Testing function expm1 for exponent 0 [seed=8344].
 rounding mode MPFR_RNDN:
      wrong underflow flag for x=4.0000000000000028@-4096
      library gives 4.0000000000000028@-4096
      mpfr    gives 4.0000000000000028@-4096
      underflow: mpfr 0, library 16

Note the glibc result is *above* the smallest subnormal 0x1p-16382, thus no
exception should be raised.

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