llvm-project

9fdf6f9b - RegisterCoalescer: Expand source register class to coalesce subreg inserts

RegisterCoalescer: Expand source register class to coalesce subreg inserts This fixes worse coalescing on AMDGPU in situations where VGPRs are copied into AGPRs. E.g. %0:vgpr_32 = COPY $vgpr0 %1:vgpr_32 = COPY $vgpr1 undef %2.sub0:areg_64 = COPY %0 %2.sub1:areg_64 = COPY %2