RFC: Patch to avoid using _finite calls in some cases (including in libmvec names)

[Steve Ellcey]

On Thu, 2019-03-14 at 13:52 +0000, Wilco Dijkstra wrote:
> Hi,
> 
> Clearly the best solution is to remove all finite renaming. Over the past years
> we've removed a lot of unnecessary inlines, redirects and other nasty hacks
> from GLIBC. GCC now sees the original functions and as a result can optimize far
> better. This is just one of the last few remaining header hacks.
> 
> We use no veneers in the new optimized math functions and as a result they are
> significantly faster, so there is no argument that the finite variants are useful or
> improve performance. It is better to handle special cases in the main code rather
> than do them in a veneer and thus need to check them twice...
> 
> So I believe we should be bold and go ahead with disabling the header
> completely.
> 
> Wilco

I agree with this approach.  The header is a hack.  My patch was a way
of removing (ifdefing out) functions from math-finite.h over time on
individual platforms but I would also support a rip-the-bandage off
quickly approach and just get rid of math-finite.h in one go.

Steve Ellcey
sellcey@marvell.com