llvm-project

d5072b94 - [RISCV] Select (and (shl X, 8), 0xff00) -> (packh zero, X) (#170654)

[RISCV] Select (and (shl X, 8), 0xff00) -> (packh zero, X) (#170654) Similar transforms with "pack" and "packw" are not useful: (pack zero, X) == (slli X, XLEN/2) (packw zero, X) == (slliw X, 16)