[PATCH] D82292: [SelectionDAG] Lower @llvm.get.active.lane.mask to setcc

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

It's not hard to write out the overflow check; just replace the ADD with UADDO, and AND the overflow result with the compare result.

Not sure about the quality of the code that would produce.  I suspect in common cases, SelectionDAG could prove the UADDO doesn't overflow using known bits.


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  https://reviews.llvm.org/D82292/new/

https://reviews.llvm.org/D82292