[PATCH] Aarch64: Add simd exp/expf functions

[Joseph Myers]

On Wed, 6 Mar 2019, Florian Weimer wrote:

> On the other hand, it could help to get libmvec out of the door more
> quickly.  I think it's not ideal that if you use an older compiler,
> you get only a subset of the glibc ABI.  We can get away with it here
> because it affects an entire soname.  Still it might be difficult to
> explain why applications are not portable.

On the whole I think I agree with Rich Felker's argument 
<https://sourceware.org/ml/libc-alpha/2015-11/msg00184.html> against 
having the presence of libmvec depend on the tools used for the build.  
(Note that the installed bits/math-vector.h file, which may be shared 
between multilibs, does not depend on the tools used, so if libmvec was 
disabled then the installed bits/math-vector.h is not actually correct and 
some programs will fail to build.)

This is an argument for removing the --disable-mathvec configure option as 
well as either having assembly wrappers or a requirement for new-enough 
tool versions for building libmvec functions on platforms where the oldest 
supported GCC / binutils aren't new enough.

-- 
Joseph S. Myers
joseph@codesourcery.com