[PATCH] D27787: Don't combine a shuffle of two BUILD_VECTORs in general.

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

Not sure about this, would we be better off attempting a SHUFFLE(BUILD_VECTOR(), BUILD_VECTOR()) -> SHUFFLE(BUILD_VECTOR(), UNDEF) combine replacing repeated insertions with shuffles?


Repository:
  rL LLVM

https://reviews.llvm.org/D27787