+ void reserveResources(llvm::MachineInstr *MI);
+
+ const InstrItineraryData *getInstrItins() const { return InstrItins; }
+};
+
+// VLIWPacketizerList - Implements a simple VLIW packetizer using DFA. The
+// packetizer works on machine basic blocks. For each instruction I in BB, the
+// packetizer consults the DFA to see if machine resources are available to
+// execute I. If so, the packetizer checks if I depends on any instruction J in
+// the current packet. If no dependency is found, I is added to current packet
+// and machine resource is marked as taken. If any dependency is found, a target
+// API call is made to prune the dependence.
+class VLIWPacketizerList {
+protected:
+ const MachineFunction &MF;
+ const TargetInstrInfo *TII;
+
+ // The VLIW Scheduler.
+ DefaultVLIWScheduler *VLIWScheduler;
+
+ // Vector of instructions assigned to the current packet.
+ std::vector<MachineInstr*> CurrentPacketMIs;
+ // DFA resource tracker.
+ DFAPacketizer *ResourceTracker;
+
+ // Generate MI -> SU map.
+ std::map<MachineInstr*, SUnit*> MIToSUnit;
+
+public:
+ VLIWPacketizerList(MachineFunction &MF, MachineLoopInfo &MLI, bool IsPostRA);
+
+ virtual ~VLIWPacketizerList();
+
+ // PacketizeMIs - Implement this API in the backend to bundle instructions.
+ void PacketizeMIs(MachineBasicBlock *MBB,
+ MachineBasicBlock::iterator BeginItr,
+ MachineBasicBlock::iterator EndItr);
+
+ // getResourceTracker - return ResourceTracker
+ DFAPacketizer *getResourceTracker() {return ResourceTracker;}
+
+ // addToPacket - Add MI to the current packet.
+ virtual MachineBasicBlock::iterator addToPacket(MachineInstr *MI) {
+ MachineBasicBlock::iterator MII = MI;
+ CurrentPacketMIs.push_back(MI);
+ ResourceTracker->reserveResources(MI);
+ return MII;
+ }
+
+ // endPacket - End the current packet.
+ void endPacket(MachineBasicBlock *MBB, MachineInstr *MI);
+
+ // initPacketizerState - perform initialization before packetizing
+ // an instruction. This function is supposed to be overrided by
+ // the target dependent packetizer.
+ virtual void initPacketizerState() { return; }
+
+ // ignorePseudoInstruction - Ignore bundling of pseudo instructions.
+ virtual bool ignorePseudoInstruction(MachineInstr *I,
+ MachineBasicBlock *MBB) {
+ return false;
+ }
+
+ // isSoloInstruction - return true if instruction MI can not be packetized
+ // with any other instruction, which means that MI itself is a packet.
+ virtual bool isSoloInstruction(MachineInstr *MI) {
+ return true;
+ }
+
+ // isLegalToPacketizeTogether - Is it legal to packetize SUI and SUJ
+ // together.
+ virtual bool isLegalToPacketizeTogether(SUnit *SUI, SUnit *SUJ) {
+ return false;
+ }
+
+ // isLegalToPruneDependencies - Is it legal to prune dependece between SUI
+ // and SUJ.
+ virtual bool isLegalToPruneDependencies(SUnit *SUI, SUnit *SUJ) {
+ return false;
+ }
+