Re: [PATCH] Aarch64: Add simd exp/expf functions

[Florian Weimer <fw at deneb dot enyo dot de>]

* Steve Ellcey:

> On Wed, 2019-03-06 at 19:04 +0000, Szabolcs Nagy wrote:
>> 
>> this will need to detect support for
>> __attribute__((aarch64_vector_pcs))
>> (which will require gcc-9)
>
> That seems easy enough to check for.

Can you add assembler trampolines, so that the compiler support
becomes optional, at a performance cost?

>> and i plan to fix the lazy binding issue
>> with vector pcs which will require a new
>> binutils too (currently that's not super
>> important since the dynamic linker is
>> unlikely to use fpregs outside of v0-v7,
>> but depending on the exact nature of the
>> solution we may require a new gcc and
>> new binutils too for libmvec)
>
> I am not sure how I would check for this.
> Will it need to be a version check on binutils
> or will there be some functionality that can
> be checked for?  A new fixup type?  Do you
> have an estimate for when the binutils change
> will go in?

I don't think the binutils change is needed for building or testing
glibc, at least not initially.  Just disable lazy binding.