llvm-project

ef927ae2 - [llvm][RISCV] Support mulh for P extension codegen (#171581)

[llvm][RISCV] Support mulh for P extension codegen (#171581) For mulh pattern with operands that are both signed or unsigned, combination is performed automatically. However for mulh with operands which are signed and unsigned respectively we need to combine them manually same approach as what we've done for PASUB*. Note: This is first patch for mulh which only handle basic high part multiplication, there will be followup patches to handle rest of mulh related instructions.