[PATCH] D79100: [LV][TTI] Emit new IR intrinsic llvm.get.active.mask for tail-folded loops

[Sjoerd Meijer via Phabricator via llvm-commits]

SjoerdMeijer added a comment.

This patch, this new intrinsic, is a straightforward translation from an icmp. It provides the required information, and exactly the same as in your example, albeit in a slightly different form. Scalable vectors, stepvector intrinsics, etc., are not used yet by the vectoriser and are not yet defined, respectively, so using that at this point is problematic.

As this is such a straightforward translation, with straightforward semantics, this won't block in any way future developments. In fact, this is the first step in that direction, and it is good we get some experience with it. We offer our support to adapt this approach/intrinsic and port it, should this be necessary, which should be straightforward.


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  https://reviews.llvm.org/D79100/new/

https://reviews.llvm.org/D79100