[PATCH] D31724: [SelectionDAG] Remove special call to LHS computeKnownBits for ANDs with constant RHS.

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

In https://reviews.llvm.org/D31724#751377, @craig.topper wrote:

> Correction, the combine-and problem seems to be because SimplifyDemandedBits only considers scalar constants for shift amount, not constant splats from a build_vector.


This is an efficiency improvement, but shouldn't we fix that first to avoid the regression?


https://reviews.llvm.org/D31724