[PATCH] D126591: [InstCombine] Optimise shift+and+boolean conversion pattern to simple comparison

[chenglin.bi via Phabricator via llvm-commits]

bcl5980 added a comment.

I'm also worry if we should canonicalize shift+and to icmp+select

> I'm not sure what impact this will have in IR, but you could try to write transforms like this in instcombine and see if that exposes other problems:
> https://alive2.llvm.org/ce/z/jA_tNb

So can we write transforms like to fix this issue?:
https://alive2.llvm.org/ce/z/DiF6Wo
https://alive2.llvm.org/ce/z/nQtvt5


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