state.f.Fatalf("at %v: slot %v in register %v with no location entry", v, state.slots[slot], &state.registers[reg])
				continue
			}
			regs := last.Registers &^ (1 << reg)
			setSlot(slot, VarLoc{regs, last.StackOffset})
		}

		locs.registers[reg] = locs.registers[reg][:0]
	}

	switch {
	case v.Op == OpVarDef:
		n := v.Aux.(*ir.Name)
		if ir.IsSynthetic(n) {
			break
		}