llvm-project

e2296d82 - [mlir][ArmSME] Lower extract from 2D scalable create_mask to psel (#96066)

[mlir][ArmSME] Lower extract from 2D scalable create_mask to psel (#96066) Example: ```mlir %mask = vector.create_mask %a, %b : vector<[4]x[8]xi1> %slice = vector.extract %mask[%index] : vector<[8]xi1> from vector<[4]x[8]xi1> ``` Becomes: ```mlir %mask_rows = vector.create_mask %a : vector<[4]xi1> %mask_cols = vector.create_mask %b : vector<[8]xi1> %slice = arm_sve.psel %mask_cols, %mask_rows[%index] : vector<[8]xi1>, vector<[4]xi1> ``` Note: While psel is under ArmSVE it requires SME (or SVE 2.1), so this is currently the most logical place for this lowering.