[llvm-dev] New x86-64 micro-architecture levels

[H.J. Lu via llvm-dev]

On Mon, Jul 13, 2020 at 12:48 AM Jan Beulich <jbeulich at suse.com> wrote:
>
> On 13.07.2020 09:40, Florian Weimer wrote:
> > * Richard Biener:
> >>> 2. I have a library with AVX2 and FMA, which directory should it go?
> >>
> >> Eventually GCC/gas can annotate objects with the lowest architecture
> >> level that is applicable?
> >
> > H.J. has patches for ELF program properties.  I think
> > GNU_PROPERTY_X86_ISA_1_NEEDED would convey this information.  This
> > proposal and the glibc patches are independent of that.
>
> From (partly just halfway) recent discussions with H.J. I gained
> the understanding that the piece we're aiming at getting to work
> properly is the recording of GNU_PROPERTY_X86_FEATURE_2_*, not
> so much GNU_PROPERTY_X86_ISA_1_*. If the ISA one is to be used as
> a basis here, a lot of new flags will need adding (and properly
> setting) first, I think.
>

We can update GNU_PROPERTY_X86_ISA_1_* as needed.

-- 
H.J.