#include "llvm/CodeGen/DFAPacketizer.h"
#include "llvm/CodeGen/MachineInstr.h"
+#include "llvm/CodeGen/MachineInstrBundle.h"
+#include "llvm/CodeGen/ScheduleDAGInstrs.h"
+#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/MC/MCInstrItineraries.h"
using namespace llvm;
const llvm::MCInstrDesc &MID = MI->getDesc();
reserveResources(&MID);
}
+
+namespace {
+// DefaultVLIWScheduler - This class extends ScheduleDAGInstrs and overrides
+// Schedule method to build the dependence graph.
+class DefaultVLIWScheduler : public ScheduleDAGInstrs {
+public:
+ DefaultVLIWScheduler(MachineFunction &MF, MachineLoopInfo &MLI,
+ MachineDominatorTree &MDT, bool IsPostRA);
+ // Schedule - Actual scheduling work.
+ void schedule();
+};
+} // end anonymous namespace
+
+DefaultVLIWScheduler::DefaultVLIWScheduler(
+ MachineFunction &MF, MachineLoopInfo &MLI, MachineDominatorTree &MDT,
+ bool IsPostRA) :
+ ScheduleDAGInstrs(MF, MLI, MDT, IsPostRA) {
+}
+
+void DefaultVLIWScheduler::schedule() {
+ // Build the scheduling graph.
+ buildSchedGraph(0);
+}
+
+// VLIWPacketizerList Ctor
+VLIWPacketizerList::VLIWPacketizerList(
+ MachineFunction &MF, MachineLoopInfo &MLI, MachineDominatorTree &MDT,
+ bool IsPostRA) : TM(MF.getTarget()), MF(MF) {
+ TII = TM.getInstrInfo();
+ ResourceTracker = TII->CreateTargetScheduleState(&TM, 0);
+ SchedulerImpl = new DefaultVLIWScheduler(MF, MLI, MDT, IsPostRA);
+}
+
+// VLIWPacketizerList Dtor
+VLIWPacketizerList::~VLIWPacketizerList() {
+ delete SchedulerImpl;
+ delete ResourceTracker;
+}
+
+// ignorePseudoInstruction - ignore pseudo instructions.
+bool VLIWPacketizerList::ignorePseudoInstruction(MachineInstr *MI,
+ MachineBasicBlock *MBB) {
+ if (MI->isDebugValue())
+ return true;
+
+ if (TII->isSchedulingBoundary(MI, MBB, MF))
+ return true;
+
+ return false;
+}
+
+// isSoloInstruction - return true if instruction I must end previous
+// packet.
+bool VLIWPacketizerList::isSoloInstruction(MachineInstr *I) {
+ if (I->isInlineAsm())
+ return true;
+
+ return false;
+}
+
+// addToPacket - Add I to the current packet and reserve resource.
+void VLIWPacketizerList::addToPacket(MachineInstr *MI) {
+ CurrentPacketMIs.push_back(MI);
+ ResourceTracker->reserveResources(MI);
+}
+
+// endPacket - End the current packet, bundle packet instructions and reset
+// DFA state.
+void VLIWPacketizerList::endPacket(MachineBasicBlock *MBB,
+ MachineInstr *I) {
+ if (CurrentPacketMIs.size() > 1) {
+ MachineInstr *MIFirst = CurrentPacketMIs.front();
+ finalizeBundle(*MBB, MIFirst, I);
+ }
+ CurrentPacketMIs.clear();
+ ResourceTracker->clearResources();
+}
+
+// PacketizeMIs - Bundle machine instructions into packets.
+void VLIWPacketizerList::PacketizeMIs(MachineBasicBlock *MBB,
+ MachineBasicBlock::iterator BeginItr,
+ MachineBasicBlock::iterator EndItr) {
+ assert(MBB->end() == EndItr && "Bad EndIndex");
+
+ SchedulerImpl->enterRegion(MBB, BeginItr, EndItr, MBB->size());
+
+ // Build the DAG without reordering instructions.
+ SchedulerImpl->schedule();
+
+ // Remember scheduling units.
+ SUnits = SchedulerImpl->SUnits;
+
+ // The main packetizer loop.
+ for (; BeginItr != EndItr; ++BeginItr) {
+ MachineInstr *MI = BeginItr;
+
+ // Ignore pseudo instructions.
+ if (ignorePseudoInstruction(MI, MBB))
+ continue;
+
+ // End the current packet if needed.
+ if (isSoloInstruction(MI)) {
+ endPacket(MBB, MI);
+ continue;
+ }
+
+ SUnit *SUI = SchedulerImpl->getSUnit(MI);
+ assert(SUI && "Missing SUnit Info!");
+
+ // Ask DFA if machine resource is available for MI.
+ bool ResourceAvail = ResourceTracker->canReserveResources(MI);
+ if (ResourceAvail) {
+ // Dependency check for MI with instructions in CurrentPacketMIs.
+ for (std::vector<MachineInstr*>::iterator VI = CurrentPacketMIs.begin(),
+ VE = CurrentPacketMIs.end(); VI != VE; ++VI) {
+ MachineInstr *MJ = *VI;
+ SUnit *SUJ = SchedulerImpl->getSUnit(MJ);
+ assert(SUJ && "Missing SUnit Info!");
+
+ // Is it legal to packetize SUI and SUJ together.
+ if (!isLegalToPacketizeTogether(SUI, SUJ)) {
+ // Allow packetization if dependency can be pruned.
+ if (!isLegalToPruneDependencies(SUI, SUJ)) {
+ // End the packet if dependency cannot be pruned.
+ endPacket(MBB, MI);
+ break;
+ } // !isLegalToPruneDependencies.
+ } // !isLegalToPacketizeTogether.
+ } // For all instructions in CurrentPacketMIs.
+ } else {
+ // End the packet if resource is not available.
+ endPacket(MBB, MI);
+ }
+
+ // Add MI to the current packet.
+ addToPacket(MI);
+ } // For all instructions in BB.
+
+ // End any packet left behind.
+ endPacket(MBB, EndItr);
+
+ SchedulerImpl->exitRegion();
+}