Re: [PATCH v2 3/3] powerpc64le: Add glibc-hwcaps support

[Tulio Magno Quites Machado Filho via Libc-alpha <libc-alpha@sourceware.org>]

Florian Weimer <fweimer@redhat.com> writes:

> GCC defines __MMA__ for -mcpu=power10, and source code will evenually be
> sensitive to that macro.
>
> I think it is important that -mcpu=power10 and the "power10"
> subdirectory mean the same thing.

I agree to stick with -mcpu values.

It was a bad interpretation of my part when I used OpenPOWER Foundation's
documents to explain the availability of features on GCC.  These are different
usages.
GCC uses -mcpu to:

    ... specify a specific processor.  Code generated under those options
    runs best on that processor, and may not run at all on others.

So, -mcpu=power10 is the IBM POWER10 processor that supports MMA.

But then, we're back to this point you had raised:

> I think we need documentation what it means for a processor to implement
> ISA 3.0, and not altivec.

Unfortunately, I think this documentation will only exist after a new -mcpu
value is created.

-- 
Tulio Magno