[PATCH] Eliminate redundant sign extensions in pow()

[Joseph Myers]

On Mon, 16 Nov 2015, Anton Blanchard wrote:

> When looking at the code generated for pow() on ppc64 I noticed quite
> a few sign extensions. Making the array indices unsigned reduces the
> number of sign extensions from 24 to 7.

OK with a ChangeLog entry if you've done the usual testing with the 
testsuite without any new ulps for pow appearing (you didn't say).

-- 
Joseph S. Myers
joseph@codesourcery.com