https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55023
--- Comment #10 from Jeffrey A. Law <law at redhat dot com> --- IIRC, the PA was a bit unique in how we had to set up the virtual registers due to the combination of stack growth and arg growth directions. It may be the case that after virtual register instantiation we're left with something different than is seen on any other architecture. Thus the potential oversight in DSE's handling of argument setup, particularly with sibcalls which use the parent's stack. But that's just speculation based on knowledge from 2 decades ago... Take it with a grain of salt...
