[PATCH] D42479: DAGCombiner: Combine SDIV with non-splat vector pow2 divisor

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In https://reviews.llvm.org/D42479#1059005, @zvi wrote:

> - N1C can be passed to matchUnaryPredicate also when the divisor is a constant-splat. Makes check more efficient as we avoid re-checking the splatted element for every vector element. (why doesn't matchUnaryPredicate check for splat and do the same?)


Because that would mean that we couldn't use the predicate to control when we accept undefs or not.


Repository:
  rL LLVM

https://reviews.llvm.org/D42479