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.
jeff
