[PATCH 2/2] PPC64: Add libmvec SIMD double-precision power function.

[Florian Weimer]

* Shawn Landden:

> Based off the ./sysdeps/ieee754/dbl-64/pow.c implementation,
> and provides identical results.
>
> However two of those *identical* results results in 1 ulp test failures,
> so I'm not sure how the non-SIMD versions are passing. These clearly should allow
> the 1 ulp variation (and the float128 results are right in the middle), and
> this is allowed by the standard:

> Maximal error of `pow_vlen2'
>  is      : 1 ulp
>  accepted: 0 ulp

I suspect this is because the scalar version looks for exceptions under
the name “pow”, and you haven't added an exception for “pow_vlen2” in
this patch.

Thanks,
Florian