[RFC] Combine vectorized loops with its scalar remainder.

Jeff Law law@redhat.com
Tue Feb 9 16:18:00 GMT 2016

On 02/09/2016 09:09 AM, Ilya Enkovich wrote:
> Another option is to peel scalar loop and then just run vectorizer
> one more time to vectorize and mask it.
> Also we may peel vectorized loop and use original version (with all
> STMT_VINFO still available) as a tail and peeled version as a main
> loop.
> Currently I think the best option is to peel scalar loop and run
> vectorizer one more time for it. This option is simpler and can also
> be used to vectorize loop tail with a smaller vector size when target
> doesn't support masking or masking is not profitable.
In general, a path where we have peeling & masking as an option seems 
wise.  The sense I've gotten from rth was that there's going to be 
classes of loops where that's going to be the best option.


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