[PATCH] D58210: [SelectionDAGLegalize] Improve promotion of CTLZ

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

@jonpa - IIRC, some targets infinite loop if we always allow the generic trunc fold in DAGCombiner after legalization, but you might be able to constrain it using the existing TLI hooks:
IsDesirableToPromoteOp()
isTypeDesirableForOp()


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  https://reviews.llvm.org/D58210/new/

https://reviews.llvm.org/D58210