Fix missing exp2 overflow exception (bug 13871)

[Andreas Jaeger]

On Wednesday, March 21, 2012 01:23:40 Joseph S. Myers wrote:
> This patch fixes bug 13871, missing overflow exception from exp2.  The
> exp2 wrapper checks the range of the input and calls __kernel_standard
> if appropriate to handle errors, but __kernel_standard does not deal
> with exceptions.  This patch changes the exp2 wrappers to follow the
> same approach as the exp10 wrappers: call the actual __ieee754_exp2*
> implementation first (which will generate any required exceptions) and
> only then test for error cases.

ok, thanks,

Andreas
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