llvm dev - Oct 2019 - SLPVectorizer and full restrict

Hi all,

Is there anybody who understands how SLPVectorizer.cpp: 
BoUpSLP::scheduleBlock(...) works ?

There is some interference with the noalias intrinsics
(https://reviews.llvm.org/D68484),
and I am not sure on how to fix it (*). 
I'll be at the conference next week. That would be a good moment to discuss.

Thanks,

Jeroen Dobbelaere
--
(*) The test-suite build fails for 'SingleSource/Benchmarks/SmallPT':
on one hand, it looks as if the vectorizer sees through the noalias intrinsics
(as expected), but then,
the scheduler gets stuck and does not schedule all the instructions, probably
because some dependencies
are not correctly resolved.

Oh wow, that's a long time ago since I worked on this. Unfortunately I'm
not at the conference next week.
I'm happy to help (if I can remember :-)).
> On 16 Oct 2019, at 22:45, Jeroen Dobbelaere <Jeroen.Dobbelaere at
synopsys.com> wrote:
> 
> Hi all,
> 
> Is there anybody who understands how SLPVectorizer.cpp: 
BoUpSLP::scheduleBlock(...) works ?
> 
> There is some interference with the noalias intrinsics
(https://reviews.llvm.org/D68484),
> and I am not sure on how to fix it (*). 
> I'll be at the conference next week. That would be a good moment to
discuss.
> 
> Thanks,
> 
> Jeroen Dobbelaere
> --
> (*) The test-suite build fails for
'SingleSource/Benchmarks/SmallPT':
> on one hand, it looks as if the vectorizer sees through the noalias
intrinsics (as expected), but then,
> the scheduler gets stuck and does not schedule all the instructions,
probably because some dependencies
> are not correctly resolved.
>