https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80283
--- Comment #24 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> --- (In reply to Wilco from comment #23) > (In reply to rsand...@gcc.gnu.org from comment #22) > > > > SCHED_PRESSURE_MODEL first tries to create a "model" schedule > > > that keeps register down as far as possible and then uses that > > > to guide the "real" schedule. It looks like the model schedule > > > goes catastrophically wrong in this case though: the original > > > order had a VFP_REGS pressure of 56 (against a capacity of 64) > > > while the model schedule had a pressure of 76(!). > > Since when does ARM have 64 128-bit VFP registers? If it can't even count > registers correctly that's the #1 problem right there... Each 32-bit chunk is modelled as a separate VFP register, and 128-bit modes take 4 registers each, so it all works out.
