1dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta//=- llvm/CodeGen/DFAPacketizer.cpp - DFA Packetizer for VLIW -*- C++ -*-=====// 2dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// 3dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// The LLVM Compiler Infrastructure 4dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// 5dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// This file is distributed under the University of Illinois Open Source 6dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// License. See LICENSE.TXT for details. 7dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// 8dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta//===----------------------------------------------------------------------===// 9dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// This class implements a deterministic finite automaton (DFA) based 10dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// packetizing mechanism for VLIW architectures. It provides APIs to 11dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// determine whether there exists a legal mapping of instructions to 12dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// functional unit assignments in a packet. The DFA is auto-generated from 13dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// the target's Schedule.td file. 14dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// 15dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// A DFA consists of 3 major elements: states, inputs, and transitions. For 16dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// the packetizing mechanism, the input is the set of instruction classes for 17dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// a target. The state models all possible combinations of functional unit 18dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// consumption for a given set of instructions in a packet. A transition 19dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// models the addition of an instruction to a packet. In the DFA constructed 20dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// by this class, if an instruction can be added to a packet, then a valid 21dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// transition exists from the corresponding state. Invalid transitions 22dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// indicate that the instruction cannot be added to the current packet. 23dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// 24dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta//===----------------------------------------------------------------------===// 25dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 26dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta#include "llvm/CodeGen/DFAPacketizer.h" 27dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta#include "llvm/CodeGen/MachineInstr.h" 28ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick#include "llvm/CodeGen/MachineInstrBundle.h" 29d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/CodeGen/ScheduleDAGInstrs.h" 30dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta#include "llvm/MC/MCInstrItineraries.h" 31d04a8d4b33ff316ca4cf961e06c9e312eff8e64fChandler Carruth#include "llvm/Target/TargetInstrInfo.h" 32dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasguptausing namespace llvm; 33dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 34dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman DasguptaDFAPacketizer::DFAPacketizer(const InstrItineraryData *I, const int (*SIT)[2], 35464f3a332f81364ee09794f9502f0b25671149c6Sebastian Pop const unsigned *SET): 36dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta InstrItins(I), CurrentState(0), DFAStateInputTable(SIT), 37dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta DFAStateEntryTable(SET) {} 38dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 39dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 40dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// 41f6f77e90a18142e196cbc2a6ee87cdf7461b17dfSebastian Pop// ReadTable - Read the DFA transition table and update CachedTable. 42dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// 43dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// Format of the transition tables: 44dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// DFAStateInputTable[][2] = pairs of <Input, Transition> for all valid 45dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// transitions 46dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// DFAStateEntryTable[i] = Index of the first entry in DFAStateInputTable 47dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// for the ith state 48dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// 49dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasguptavoid DFAPacketizer::ReadTable(unsigned int state) { 50dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta unsigned ThisState = DFAStateEntryTable[state]; 51dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta unsigned NextStateInTable = DFAStateEntryTable[state+1]; 52dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta // Early exit in case CachedTable has already contains this 53f6f77e90a18142e196cbc2a6ee87cdf7461b17dfSebastian Pop // state's transitions. 54dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta if (CachedTable.count(UnsignPair(state, 55dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta DFAStateInputTable[ThisState][0]))) 56dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta return; 57dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 58dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta for (unsigned i = ThisState; i < NextStateInTable; i++) 59dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta CachedTable[UnsignPair(state, DFAStateInputTable[i][0])] = 60dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta DFAStateInputTable[i][1]; 61dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta} 62dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 63dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 64dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// canReserveResources - Check if the resources occupied by a MCInstrDesc 65f6f77e90a18142e196cbc2a6ee87cdf7461b17dfSebastian Pop// are available in the current state. 66464f3a332f81364ee09794f9502f0b25671149c6Sebastian Popbool DFAPacketizer::canReserveResources(const llvm::MCInstrDesc *MID) { 67dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta unsigned InsnClass = MID->getSchedClass(); 68464f3a332f81364ee09794f9502f0b25671149c6Sebastian Pop const llvm::InstrStage *IS = InstrItins->beginStage(InsnClass); 69b460a3382961c5be9952a75d46228f624edbd39fHal Finkel unsigned FuncUnits = IS->getUnits(); 70dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta UnsignPair StateTrans = UnsignPair(CurrentState, FuncUnits); 71dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta ReadTable(CurrentState); 72dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta return (CachedTable.count(StateTrans) != 0); 73dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta} 74dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 75dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 76dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// reserveResources - Reserve the resources occupied by a MCInstrDesc and 77f6f77e90a18142e196cbc2a6ee87cdf7461b17dfSebastian Pop// change the current state to reflect that change. 78464f3a332f81364ee09794f9502f0b25671149c6Sebastian Popvoid DFAPacketizer::reserveResources(const llvm::MCInstrDesc *MID) { 79dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta unsigned InsnClass = MID->getSchedClass(); 80464f3a332f81364ee09794f9502f0b25671149c6Sebastian Pop const llvm::InstrStage *IS = InstrItins->beginStage(InsnClass); 81b460a3382961c5be9952a75d46228f624edbd39fHal Finkel unsigned FuncUnits = IS->getUnits(); 82dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta UnsignPair StateTrans = UnsignPair(CurrentState, FuncUnits); 83dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta ReadTable(CurrentState); 84dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta assert(CachedTable.count(StateTrans) != 0); 85dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta CurrentState = CachedTable[StateTrans]; 86dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta} 87dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 88dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 89dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// canReserveResources - Check if the resources occupied by a machine 90f6f77e90a18142e196cbc2a6ee87cdf7461b17dfSebastian Pop// instruction are available in the current state. 91464f3a332f81364ee09794f9502f0b25671149c6Sebastian Popbool DFAPacketizer::canReserveResources(llvm::MachineInstr *MI) { 92464f3a332f81364ee09794f9502f0b25671149c6Sebastian Pop const llvm::MCInstrDesc &MID = MI->getDesc(); 93dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta return canReserveResources(&MID); 94dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta} 95dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta 96dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta// reserveResources - Reserve the resources occupied by a machine 97f6f77e90a18142e196cbc2a6ee87cdf7461b17dfSebastian Pop// instruction and change the current state to reflect that change. 98464f3a332f81364ee09794f9502f0b25671149c6Sebastian Popvoid DFAPacketizer::reserveResources(llvm::MachineInstr *MI) { 99464f3a332f81364ee09794f9502f0b25671149c6Sebastian Pop const llvm::MCInstrDesc &MID = MI->getDesc(); 100dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta reserveResources(&MID); 101dc81e5da271ed394e2029c83458773c4ae2fc5f4Anshuman Dasgupta} 102ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 103902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pandenamespace llvm { 104ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick// DefaultVLIWScheduler - This class extends ScheduleDAGInstrs and overrides 105ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick// Schedule method to build the dependence graph. 106ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trickclass DefaultVLIWScheduler : public ScheduleDAGInstrs { 107ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trickpublic: 108ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick DefaultVLIWScheduler(MachineFunction &MF, MachineLoopInfo &MLI, 10937ed9c199ca639565f6ce88105f9e39e898d82d0Stephen Hines bool IsPostRA); 110ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // Schedule - Actual scheduling work. 11136b56886974eae4f9c5ebc96befd3e7bfe5de338Stephen Hines void schedule() override; 112ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick}; 113902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande} 114e746186ed4f61bf5eba13112cb8419c95cf58e52Andrew Trick 11537ed9c199ca639565f6ce88105f9e39e898d82d0Stephen HinesDefaultVLIWScheduler::DefaultVLIWScheduler(MachineFunction &MF, 11637ed9c199ca639565f6ce88105f9e39e898d82d0Stephen Hines MachineLoopInfo &MLI, bool IsPostRA) 11737ed9c199ca639565f6ce88105f9e39e898d82d0Stephen Hines : ScheduleDAGInstrs(MF, &MLI, IsPostRA) { 118902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande CanHandleTerminators = true; 119ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick} 120ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 121953be893e8cffa0ef9bf410036cd96aeb526e98aAndrew Trickvoid DefaultVLIWScheduler::schedule() { 122ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // Build the scheduling graph. 123dce4a407a24b04eebc6a376f8e62b41aaa7b071fStephen Hines buildSchedGraph(nullptr); 124ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick} 125ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 126ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick// VLIWPacketizerList Ctor 12737ed9c199ca639565f6ce88105f9e39e898d82d0Stephen HinesVLIWPacketizerList::VLIWPacketizerList(MachineFunction &MF, 12837ed9c199ca639565f6ce88105f9e39e898d82d0Stephen Hines MachineLoopInfo &MLI, bool IsPostRA) 12937ed9c199ca639565f6ce88105f9e39e898d82d0Stephen Hines : MF(MF) { 13037ed9c199ca639565f6ce88105f9e39e898d82d0Stephen Hines TII = MF.getSubtarget().getInstrInfo(); 13137ed9c199ca639565f6ce88105f9e39e898d82d0Stephen Hines ResourceTracker = TII->CreateTargetScheduleState(MF.getSubtarget()); 13237ed9c199ca639565f6ce88105f9e39e898d82d0Stephen Hines VLIWScheduler = new DefaultVLIWScheduler(MF, MLI, IsPostRA); 133ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick} 134ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 135ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick// VLIWPacketizerList Dtor 136ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew TrickVLIWPacketizerList::~VLIWPacketizerList() { 137902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande if (VLIWScheduler) 138902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande delete VLIWScheduler; 139ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 140902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande if (ResourceTracker) 141902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande delete ResourceTracker; 142ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick} 143ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 144ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick// endPacket - End the current packet, bundle packet instructions and reset 145ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick// DFA state. 146ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trickvoid VLIWPacketizerList::endPacket(MachineBasicBlock *MBB, 147902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande MachineInstr *MI) { 148ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick if (CurrentPacketMIs.size() > 1) { 149ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick MachineInstr *MIFirst = CurrentPacketMIs.front(); 150902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande finalizeBundle(*MBB, MIFirst, MI); 151ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick } 152ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick CurrentPacketMIs.clear(); 153ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick ResourceTracker->clearResources(); 154ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick} 155ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 156ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick// PacketizeMIs - Bundle machine instructions into packets. 157ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trickvoid VLIWPacketizerList::PacketizeMIs(MachineBasicBlock *MBB, 158ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick MachineBasicBlock::iterator BeginItr, 159ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick MachineBasicBlock::iterator EndItr) { 160902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande assert(VLIWScheduler && "VLIW Scheduler is not initialized!"); 161902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande VLIWScheduler->startBlock(MBB); 162d2763f6ce62eaa497e944331668414e35f3712f3Andrew Trick VLIWScheduler->enterRegion(MBB, BeginItr, EndItr, 163d2763f6ce62eaa497e944331668414e35f3712f3Andrew Trick std::distance(BeginItr, EndItr)); 164902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande VLIWScheduler->schedule(); 165902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande 166902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande // Generate MI -> SU map. 167902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande MIToSUnit.clear(); 168902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande for (unsigned i = 0, e = VLIWScheduler->SUnits.size(); i != e; ++i) { 169902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande SUnit *SU = &VLIWScheduler->SUnits[i]; 170902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande MIToSUnit[SU->getInstr()] = SU; 171902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande } 172ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 173ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // The main packetizer loop. 174ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick for (; BeginItr != EndItr; ++BeginItr) { 175ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick MachineInstr *MI = BeginItr; 176ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 177902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande this->initPacketizerState(); 178ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 179ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // End the current packet if needed. 180902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande if (this->isSoloInstruction(MI)) { 181ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick endPacket(MBB, MI); 182ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick continue; 183ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick } 184ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 185902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande // Ignore pseudo instructions. 186902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande if (this->ignorePseudoInstruction(MI, MBB)) 187902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande continue; 188902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande 189902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande SUnit *SUI = MIToSUnit[MI]; 190ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick assert(SUI && "Missing SUnit Info!"); 191ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 192ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // Ask DFA if machine resource is available for MI. 193ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick bool ResourceAvail = ResourceTracker->canReserveResources(MI); 194ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick if (ResourceAvail) { 195ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // Dependency check for MI with instructions in CurrentPacketMIs. 196ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick for (std::vector<MachineInstr*>::iterator VI = CurrentPacketMIs.begin(), 197ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick VE = CurrentPacketMIs.end(); VI != VE; ++VI) { 198ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick MachineInstr *MJ = *VI; 199902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande SUnit *SUJ = MIToSUnit[MJ]; 200ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick assert(SUJ && "Missing SUnit Info!"); 201ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 202ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // Is it legal to packetize SUI and SUJ together. 203902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande if (!this->isLegalToPacketizeTogether(SUI, SUJ)) { 204ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // Allow packetization if dependency can be pruned. 205902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande if (!this->isLegalToPruneDependencies(SUI, SUJ)) { 206ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // End the packet if dependency cannot be pruned. 207ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick endPacket(MBB, MI); 208ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick break; 209ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick } // !isLegalToPruneDependencies. 210ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick } // !isLegalToPacketizeTogether. 211ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick } // For all instructions in CurrentPacketMIs. 212ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick } else { 213ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // End the packet if resource is not available. 214ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick endPacket(MBB, MI); 215ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick } 216ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 217ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // Add MI to the current packet. 218902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande BeginItr = this->addToPacket(MI); 219ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick } // For all instructions in BB. 220ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick 221ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick // End any packet left behind. 222ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick endPacket(MBB, EndItr); 223902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande VLIWScheduler->exitRegion(); 224902337092fef14ce2519b4c93c37d72bf66ce768Sirish Pande VLIWScheduler->finishBlock(); 225ebafa0c61170682ec0d7025f46f187a164b0db7eAndrew Trick} 226