[LLVMdev] Vectorization of loops with conditional dereferencing

[Stephen Lin]

Nadav and Arnold,

What is the current status of vectorization pragmas? Do you think that's
something I might be able to take on if you two are busy with other things?

Stephen

On Thu, Nov 14, 2013 at 11:10 AM, Nadav Rotem <nrotem at apple.com> wrote:

> Its a good point.  We will need to document the semantics of the
> vectorization pragma well.
>
> On Nov 14, 2013, at 10:58 AM, Ralf Karrenberg <Chareos at gmx.de> wrote:
>
> > Hi Nadav,
> >
> > On 14/11/13 17:38, Nadav Rotem wrote:
> >> Sure.  Vectorization of stores is done by loading the current value
> from memory, blending the new value and saving it back to memory.
> >
> > Just a side note: You may run into trouble with this approach when
> people start using the loop vectorizer in combination with multi threading.
> The load/blend/store scheme introduces a race condition in this scenario.
> > I don't know if this is a valid use case for you, but it may be worth
> keeping in mind.
> >
> > Cheers,
> > Ralf
>
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