[PATCH] D129933: [DAG] SimplifyDemandedBits - relax "xor (X >> ShiftC), XorC --> (not X) >> ShiftC" to match only demanded bits

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D129933#3658367 <https://reviews.llvm.org/D129933#3658367>, @RKSimon wrote:

> Do people think this is going to need a TLI callback ?

We might be able to adjust visitShiftByConstant + isDesirableToCommuteWithShift to handle this - I'll take a look.


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https://reviews.llvm.org/D129933