[llvm-dev] Compile for ARM SVE with the latest LLVM

[Itaru Kitayama via llvm-dev]

Will,
When you guys announce the SVE codegen support is merged in the trunk,
hopefully in the near future, that means all of the features/functions
that can currently be found in the current release of Arm Compiler for
Linux, correct? We were sitting down this afternoon and wondering about
this a bit thus I am asking.

On Thu, Sep 12, 2019 at 5:44 PM Will Lovett <Will.Lovett at arm.com> wrote:

> Hi Itaru,
>
>
>
> (and thanks for the replies on this Renato).
>
>
>
> We (Arm HPC) initially put up that github branch as an aid to the
> discussions on upstream SVE support.  The branch was very old (LLVM-5
> based!), and various aspects of our implementation have changed
> significantly, following discussions with the community.  For this reason,
> we felt that branch was unhelpful at this point, so have removed it.
>
>
>
> The team are working hard on getting SVE codegen support into LLVM, but
> it’s not there yet.  For now, this leaves the following options for testing
> vectorization with SVE:
>
>    - Get an up to date GNU compiler, which has SVE vectorization support
>    - Use Arm Compiler for Linux (the new name for Arm Compiler for HPC)
>
>
>
> If you’re interested in the latter option, feel free to give me a mail
> (will.lovett at arm dot com).  Depending on your use-case, there may be
> scope for arranging a license.
>
>
>
> Thanks,
>
>
>
> Will.
>
>
>
>
>
> *Will Lovett*
>
> Technical Product owner
>
> Compilers & Libraries
> Arm Allinea Studio
>
>
>
> On 11/09/2019, 22:31, "llvm-dev on behalf of Itaru Kitayama via llvm-dev" <
> llvm-dev-bounces at lists.llvm.org on behalf of llvm-dev at lists.llvm.org>
> wrote:
>
>
>
> Renato et al.
>
> In the meantime, is there an out of tree branch I mean, other than LLVM
> trunk so I can test how much I can SVE vectorize my code with it?
>
>
>
> Arm seemed to gave taken down the GitHub branch for sometime.
>
>
>
> On Wed, Sep 11, 2019 at 20:41 Renato Golin <rengolin at gmail.com> wrote:
>
> On Wed, 11 Sep 2019 at 06:13, Itaru Kitayama via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
> > Hi,
> > I'm still seeing the same ie trying to produce SVE instructions but
> > resulted in NEONs with Clang as of Sep. 10th.
> > http://lists.llvm.org/pipermail/llvm-dev/2019-March/130788.html
>
> Hi Itaru-san,
>
> IR SVE implementation is ongoing, CC'ing Graham who is leading that effort.
>
> I'm hoping we can have something working before the next release is
> branched (Dec/Jan), but I don't expect it to be fully featured (inline
> asm, full ACLE, auto-vec in all NEON cases, etc).
>
> cheers,
> --renato
>
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