// CSR aliases go after the volatile registers, preserve the target's order.
std::copy(CSRAlias.begin(), CSRAlias.end(), &RCI.Order[N]);
+ // Check if RC is a proper sub-class.
+ if (const TargetRegisterClass *Super = TRI->getLargestLegalSuperClass(RC))
+ if (Super != RC && getNumAllocatableRegs(Super) > RCI.NumRegs)
+ RCI.ProperSubClass = true;
+
DEBUG({
dbgs() << "AllocationOrder(" << RC->getName() << ") = [";
for (unsigned I = 0; I != RCI.NumRegs; ++I)
dbgs() << ' ' << PrintReg(RCI.Order[I], TRI);
- dbgs() << " ]\n";
+ dbgs() << (RCI.ProperSubClass ? " ] (sub-class)\n" : " ]\n");
});
// RCI is now up-to-date.