llvm dev - Sep 2020 - Vectorization of math function failed?

On Tue, Sep 1, 2020 at 9:07 AM Venkataramanan Kumar
<venkataramanan.kumar.llvm at gmail.com> wrote:
>   Hi Alexandre,
Hi Venkataramanan,
> I am not sure if we can generate vector calls to GlibC libmvec.
Is the support for libmvec on the roadmap? If not how to add it?
> ./clang --autocomplete=-fveclibThis is amazing, thank you! I think it
should be documented in clang
auto vectorization documentation.

Thank you very much,
-- 
Alexandre BIQUE

Hi Alexandre,

On Tue, 1 Sep, 2020, 2:21 pm Alexandre Bique, <bique.alexandre at
gmail.com>
wrote:
> On Tue, Sep 1, 2020 at 9:07 AM Venkataramanan Kumar
> <venkataramanan.kumar.llvm at gmail.com> wrote:
> >   Hi Alexandre,
>
> Hi Venkataramanan,
>
> > I am not sure if we can generate vector calls to GlibC libmvec.
> Is the support for libmvec on the roadmap? If not how to add it?
>
I also wanted to check with others here,  if we can add support for vector
routines in Glibc libmvec.

Libmvec may not be available in machines which uses lower versions of
glibc. We may have to take care of generating calls only when we detect
libmvec and also meet required ISA requirements.

Otherwise is it ok to generate vector calls under a flag?

Regards,
Venkat.


> > ./clang --autocomplete=-fveclib> This is amazing, thank you! I
think it should be documented in clang
> auto vectorization documentation.
>
> Thank you very much,
> --
> Alexandre BIQUE
>
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Hi,
> On Sep 1, 2020, at 10:26, Venkataramanan Kumar via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> Hi Alexandre,
> 
> On Tue, 1 Sep, 2020, 2:21 pm Alexandre Bique, <bique.alexandre at
gmail.com <mailto:bique.alexandre at gmail.com>> wrote:
> On Tue, Sep 1, 2020 at 9:07 AM Venkataramanan Kumar
> <venkataramanan.kumar.llvm at gmail.com
<mailto:venkataramanan.kumar.llvm at gmail.com>> wrote:
> >   Hi Alexandre,
> 
> Hi Venkataramanan,
> 
> > I am not sure if we can generate vector calls to GlibC libmvec.
> Is the support for libmvec on the roadmap? If not how to add it?
> 
> I also wanted to check with others here,  if we can add support for vector
routines in Glibc libmvec.
> 
> Libmvec may not be available in machines which uses lower versions of
glibc. We may have to take care of generating calls only when we detect libmvec
and also meet required ISA requirements.
> 
> Otherwise is it ok to generate vector calls under a flag?
The existing vector library variants are enabled with a flag (`-vector-library`)
on the LLVM side as mentioned earlier. I think it would make sense to add
support for libmvec in a similar fashion. That should be relatively
straight-forward.

Cheers,
Florian
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