Re: Optionally using more advanced CPU features

[ludovic.courtes@inria.fr (Ludovic Courtès)]

Hello,

Dave Love <fx@gnu.org> skribis:

> Ludovic Courtès <ludovic.courtes@inria.fr> writes:

[...]

>> But that sounds similar to IFUNC in that application code would need to
>> actually use hwcap info to select the right implementation at load time,
>> right?
>
> As far as I know, it's a loader feature.  See "Hardware capabilities" in
> ld.so(1).

Indeed.

I’ve looked at the newish libmvec along with the “Vector ABI” in the
toolchain and it’s really the kind of thing we’re looking for.

> Well, you could embark on some sort of (GCC-specific?) re-write, but it
> would be better to work on <https://github.com/flame/blis/issues/129>.
> I don't think there's anywhere you can just attach GCC attributes, and
> certainly no magic will happen for currently-unsupported architectures.

Agreed, adjusting BLIS to do some load-time configuration seems like the
right thing.  Thanks for the reference, we’ll see how it goes.

Ludo’.