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

Hi Venkat.,

Did you make progress with libmvec?
Is there a chance that it lands into clang 11?

Regards,
Alexandre Bique

On Tue, Sep 1, 2020 at 11:50 AM Venkataramanan Kumar
<venkataramanan.kumar.llvm at gmail.com> wrote:
>
> Hi Florian,
>
> On Tue, 1 Sep, 2020, 3:11 pm Florian Hahn, <florian_hahn at
apple.com> wrote:
>>
>> 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> 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?
>>
>>
>> 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.
>
>
> Oh ok,  let me try and prepare a patch.
>
> Regards
> Venkat.
>
>>
>> Cheers,
>> Florian

Hi Alexandre,

I have not yet started the patch work.

Collected information about the ABI for the routines.   To start with I am
thinking of supporting  pow/lib/exp/sin/cos/log routines till VF 8 which
are non masked variants in the initial patch.
I will try to send the patch early next week.

regards,
Venkat,





On Tue, 15 Sep 2020 at 17:57, Alexandre Bique <bique.alexandre at
gmail.com>
wrote:
> Hi Venkat.,
>
> Did you make progress with libmvec?
> Is there a chance that it lands into clang 11?
>
> Regards,
> Alexandre Bique
>
> On Tue, Sep 1, 2020 at 11:50 AM Venkataramanan Kumar
> <venkataramanan.kumar.llvm at gmail.com> wrote:
> >
> > Hi Florian,
> >
> > On Tue, 1 Sep, 2020, 3:11 pm Florian Hahn, <florian_hahn at
apple.com>
> wrote:
> >>
> >> 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> 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?
> >>
> >>
> >> 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.
> >
> >
> > Oh ok,  let me try and prepare a patch.
> >
> > Regards
> > Venkat.
> >
> >>
> >> Cheers,
> >> Florian
>
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On Tue, Sep 15, 2020 at 3:58 PM Venkataramanan Kumar
<venkataramanan.kumar.llvm at gmail.com> wrote:
> I have not yet started the patch work.
>
> Collected information about the ABI for the routines.   To start with I am
thinking of supporting  pow/lib/exp/sin/cos/log routines till VF 8 which are non
masked variants in the initial patch.
> I will try to send the patch early next week.
Great, let me know if you need help or don't have time to look at it.

Regards,
Alexandre