https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110313
--- Comment #5 from Andrew Stubbs <ams at gcc dot gnu.org> --- One thing that is unusual about the GCN stack pointer is that it's actually two registers. Could this be breaking some cprop assumptions? GCN can't fit an address in one (SImode) register so all (DImode) pointers require a pair of registers. We had to rework the dwarf stack representation code for this architecture, so I'm pretty sure no other port does this.
