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[Bug math/16560] spurious underflow exception from exp2/exp10


https://sourceware.org/bugzilla/show_bug.cgi?id=16560

--- Comment #2 from Paul Zimmermann <zimmerma+gcc at loria dot fr> ---
same in double precision (for exp2):

Testing function exp2 for exponent 0 [seed=14309].
 rounding mode MPFR_RNDN:
      wrong underflow flag: mpfr gives 0, library 16
      x=4.0000000000000@-269
      library gives 1.0000000000000
      mpfr    gives 1.0000000000000

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