llvm-project

9b8a0c3e - [InstSimplify] Fold splice.right(splice.left(poison, x, offset), poison, offset) -> x (#204256)

[InstSimplify] Fold splice.right(splice.left(poison, x, offset), poison, offset) -> x (#204256) Fixes #203027 Adds an InstSimplify fold for llvm.vector.splice.left/m.vector.splice.right roundtrip. The values in a vector are first shifted to the right and then to the left, filling the clipped off values with poison. In this scenario, the shift operations get simplified to just x.