- /// next - 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();
+ /// 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() {
+ if (Pos < 0)
+ return Hints.end()[Pos++];
+ while (Pos < int(Order.size())) {
+ 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;
+ }
+
+ /// Start over from the beginning.
+ void rewind() { Pos = -int(Hints.size()); }