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[LoopVectorize] Let selectVectorizationFactor choose a scalable VF.
AbandonedPublic

Authored by sdesmalen on Feb 11 2021, 2:00 PM.

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Summary

This patch changes the algorithm of selectVectorizationFactor to
iterate all power of 2 VFs between Min/MaxFactor, for both fixed
and scalable Min/MaxFactor VFs. It then invokes the cost-model as
normal, and selects the most cost-effective VF to vectorize the
loop.

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