llvm-project

c9ec54a8 - [RISCV] Add DUMMY_REG_PAIR_WITH_X0->GPR copy to copyPhysReg. (#209964)

[RISCV] Add DUMMY_REG_PAIR_WITH_X0->GPR copy to copyPhysReg. (#209964) The register coalescer can convert (extract_subreg x0_pair, sub_gpr_odd) to a read of DUMMY_REG_PAIR_WITH_X0. This patch treats it the same as a copy from X0. I don't know if this is a good long term fix, but I think it's ok for now. I will continue to look for other options.