llvm-project

bae41127 - [DAG] replaceShuffleOfInsert - add support for shuffle_vector(scalar_to_vector(x),y) -> insert_vector_elt(y,x,c) (#127210)

[DAG] replaceShuffleOfInsert - add support for shuffle_vector(scalar_to_vector(x),y) -> insert_vector_elt(y,x,c) (#127210) Begin extending replaceShuffleOfInsert to handle other forms of scalar insertion into a vector. I've limited this to targets that have Custom/Legal ISD::INSERT_VECTOR_ELT handling for now - although we can probably always fold this before LegalOperations.