[PATCH] D45585: [DAGCombiner][X86] When promoting loads don't use ZEXTLOAD even its legal

[Craig Topper via Phabricator via llvm-commits]

craig.topper added a comment.

It seems DAG combine doesn't know these properties which accounts for some of the redundancies seen in the test output. We can either improve DAG combine or just trust that InstCombine would have prevented this in the first place

(A&B)&A -> A & B
(A^B)^A -> B


https://reviews.llvm.org/D45585