[PATCH] D85463: [GlobalISel] Add combine for (x & mask) -> x when (x & mask) == x

[Jessica Paquette via Phabricator via llvm-commits]

paquette added a comment.

I didn't port this directly from the DAGCombiner, I originally wrote it just to handle the G_ICMP + G_AND pattern, which appears fairly often in AArch64.

But then I noticed the DAGCombiner does this:

  // fold (and x, -1) -> x

and decided to try to generalize it.


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  https://reviews.llvm.org/D85463/new/

https://reviews.llvm.org/D85463