const unsigned *Pos;
const RegisterClassInfo &RCI;
unsigned Hint;
+ bool OwnedBegin;
public:
/// AllocationOrder - Create a new AllocationOrder for VirtReg.
/// @param VirtReg Virtual register to allocate for.
/// @param VRM Virtual register map for function.
- /// @param ReservedRegs Set of reserved registers as returned by
- /// TargetRegisterInfo::getReservedRegs().
+ /// @param RegClassInfo Information about reserved and allocatable registers.
AllocationOrder(unsigned VirtReg,
const VirtRegMap &VRM,
const RegisterClassInfo &RegClassInfo);
+ ~AllocationOrder();
+
/// 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();
+ unsigned next() {
+ // First take the hint.
+ if (!Pos) {
+ Pos = Begin;
+ if (Hint)
+ return Hint;
+ }
+ // Then look at the order from TRI.
+ while (Pos != End) {
+ unsigned Reg = *Pos++;
+ if (Reg != Hint)
+ return Reg;
+ }
+ return 0;
+ }
/// rewind - Start over from the beginning.
void rewind() { Pos = 0; }