https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97497
--- Comment #7 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> --- (In reply to Andreas Krebbel from comment #6) > Alternatively I could also mark r12 as preserved across function calls for > -fpic in the backend. In fact all the bits we care about are preserved. > Since the register is fixed all the accesses do come from the backend itself. Ah, yeah, that sounds good to me FWIW. > That's similar to what I was trying with the fixed_regs hack. But I agree > that this might not be correct in general. > > The full fix is probably to track the exact parts of partially clobbered > regs which stay live but this would be a major change. Yeah. If you do the above, I'll open a new PR for the underlying gcse.c issue, since I think the problem is latent on targets that have “real” partially-clobbered registers.
