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[Bug math/16516] spurious underflow exception from erff


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

--- Comment #2 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
and another example in double precision:

Testing function erf for exponent 0 [seed=7626].
 rounding mode MPFR_RNDN:
      wrong underflow flag for x=-3.8b7f12369ded8@-256
      library gives -4.0000000000004@-256
      mpfr    gives -4.0000000000004@-256
      underflow: mpfr 0, library 16

Since the result is larger in magnitude than the smallest normal number
0x1p-1022, we should get no underflow exception.

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