[PATCH] D44442: [X86] Teach X86TargetLowering::targetShrinkDemandedConstant to set non-demanded bits if it helps created an and mask that can be matched as a zero extend.

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

The pattern matching detects (and (shift)) and (shift (and)) since we canonicalize the order of shifts and ands. This patch handles 0xffff for (and (srl)) and (shl (and))


Repository:
  rL LLVM

https://reviews.llvm.org/D44442