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[Bug math/16516] spurious underflow exception from erff


https://sourceware.org/bugzilla/show_bug.cgi?id=16516

--- Comment #3 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
idem in extended precision:

Testing function erf for exponent 0 [seed=8344].
 rounding mode MPFR_RNDN:
      wrong underflow flag for x=3.8b7f12369ded5518@-4096
      library gives 4.0000000000000028@-4096
      mpfr    gives 4.0000000000000028@-4096
      underflow: mpfr 0, library 16

Note the glibc result is *above* the smallest normal number.

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