[PATCH] D140858: [InstCombine]: Don't simplify bits if it causes imm32 to become imm64

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

+1 to investigate whether this can be handled in DAG before adding something so specific to InstCombine - if value tracking can confirm that the upper bits are already zero there's no reason why the various SimplifyDemanded* calls shouldn't determine if a sext-imm is a better option for a specific target


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  https://reviews.llvm.org/D140858/new/

https://reviews.llvm.org/D140858