[PATCH] D79452: [VectorCombine] scalarize binop of inserted elements into undef

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

Random question - what about special case undef handling for the upper elements?

opt -instcombine

  define i32 @square()  {
      %1 = xor i32 undef, undef
      ret i32 %1
  }
  ->
  define i32 @square() {
    ret i32 0
  }


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D79452/new/

https://reviews.llvm.org/D79452