+ const RegisterClassInfo &RegClassInfo,
+ const LiveRegMatrix *Matrix);
+
+ /// Get the allocation order without reordered hints.
+ ArrayRef<MCPhysReg> getOrder() const { return Order; }
+
+ /// Return the next physical register in the allocation order, or 0.
+ /// It is safe to call next() again after it returned 0, it will keep
+ /// returning 0 until rewind() is called.
+ unsigned next(unsigned Limit = 0) {
+ if (Pos < 0)
+ return Hints.end()[Pos++];
+ if (!Limit)
+ Limit = Order.size();
+ while (Pos < int(Limit)) {
+ unsigned Reg = Order[Pos++];
+ if (!isHint(Reg))
+ return Reg;
+ }
+ return 0;
+ }
+
+ /// As next(), but allow duplicates to be returned, and stop before the
+ /// Limit'th register in the RegisterClassInfo allocation order.
+ ///
+ /// This can produce more than Limit registers if there are hints.
+ unsigned nextWithDups(unsigned Limit) {
+ if (Pos < 0)
+ return Hints.end()[Pos++];
+ if (Pos < int(Limit))
+ return Order[Pos++];
+ return 0;
+ }