[PATCH] D63382: [InstCombine] fold a shifted zext to a select

[Joan LLuch via Phabricator via llvm-commits]

joanlluch added a comment.

@spatel  I want to express my support to selects over bit manipulation instructions in IR, as stated above, in order to move such optimisations to DAGCombine. Ideally, this should involve the removal of some of the existing InstCombineSelect transformations, particularly most of the ones in foldSelectInstWithICmp. However, as I exposed earlier in LLVM-dev, the DAGCombine code should incorporate hooks to allow targets to decide whether such bihacks are actually profitable, or it's best to keep them as selects.


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  https://reviews.llvm.org/D63382/new/

https://reviews.llvm.org/D63382