[PATCH] #pragma vectorize

[Nadav Rotem]

On Apr 22, 2014, at 12:07 PM, Hal Finkel <hfinkel at anl.gov> wrote:

> Hrmm; interesting. Is this the behavior we want? I'd be inclined to say that the pragma should imply safety.

I prefer to implement ‘unsafe’ vectorization with a separate pragma keyword.  I would like to discourage users from using this option because it can break the correctness of their program, and I think that ’safe’ is a better default.  Vectorizing a loop in an ‘unsafe’ mode adds a risk and marking the loop with the ‘unsafe’ keyword makes the decision explicit and documents.  
I think that it is reasonable to require users to write: #pragma vectorize unsafe width(4) …  

Thanks,
Nadav
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