[PATCH] Fix exp2* on very small values

[Ulrich Drepper]

Jakub Jelinek <jakub@redhat.com> writes:

> The exp2* wrappers would signal underflow too early (they should do so when
> real underflow happens, not when the returned value would be denormal), on
> the other side __ieee754_exp* had the low threshold too small (arguments
> <= 2^(*_MIN_EXP - *_MANT_DIG - 1) underflow, while the code was testing
> arguments < 2^(*_MIN_EXP - *_MANT_DIG - 2)).

Seems OK.  Thanks,

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