[PATCH] D126617: [InstCombine] Optimize shl+lshr+and conversion pattern

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

I still think we should split this patch up as 2 independent transforms.

The opposite shifts transform doesn't seem like it should be a power-of-2-mask transform. Can we handle that using demanded bits instead? Double-check (you can pre-commit more tests as needed), but I don't think this patch will handle these related folds:
https://alive2.llvm.org/ce/z/SNmj5M


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https://reviews.llvm.org/D126617