mirror of
https://github.com/c64scene-ar/llvm-6502.git
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00b16889ab
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22523 91177308-0d34-0410-b5e6-96231b3b80d8
3156 lines
115 KiB
C++
3156 lines
115 KiB
C++
//===-- ModuloSchedulingSuperBlock.cpp - ModuloScheduling--------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This ModuloScheduling pass is based on the Swing Modulo Scheduling
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// algorithm, but has been extended to support SuperBlocks (multiple
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// basic block, single entry, multipl exit loops).
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "ModuloSchedSB"
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#include "DependenceAnalyzer.h"
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#include "ModuloSchedulingSuperBlock.h"
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#include "llvm/Constants.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/GraphWriter.h"
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#include "llvm/Support/Timer.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/SCCIterator.h"
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#include "llvm/Instructions.h"
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#include "../MachineCodeForInstruction.h"
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#include "../SparcV9RegisterInfo.h"
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#include "../SparcV9Internals.h"
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#include "../SparcV9TmpInstr.h"
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#include <fstream>
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#include <sstream>
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#include <cmath>
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#include <utility>
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using namespace llvm;
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/// Create ModuloSchedulingSBPass
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///
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FunctionPass *llvm::createModuloSchedulingSBPass(TargetMachine & targ) {
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DEBUG(std::cerr << "Created ModuloSchedulingSBPass\n");
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return new ModuloSchedulingSBPass(targ);
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}
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#if 1
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#define TIME_REGION(VARNAME, DESC) \
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NamedRegionTimer VARNAME(DESC)
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#else
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#define TIME_REGION(VARNAME, DESC)
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#endif
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//Graph Traits for printing out the dependence graph
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template<typename GraphType>
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static void WriteGraphToFileSB(std::ostream &O, const std::string &GraphName,
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const GraphType >) {
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std::string Filename = GraphName + ".dot";
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O << "Writing '" << Filename << "'...";
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std::ofstream F(Filename.c_str());
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if (F.good())
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WriteGraph(F, GT);
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else
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O << " error opening file for writing!";
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O << "\n";
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};
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namespace llvm {
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Statistic<> NumLoops("moduloschedSB-numLoops", "Total Number of Loops");
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Statistic<> NumSB("moduloschedSB-numSuperBlocks", "Total Number of SuperBlocks");
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Statistic<> BBWithCalls("modulosched-BBCalls", "Basic Blocks rejected due to calls");
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Statistic<> BBWithCondMov("modulosched-loopCondMov",
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"Basic Blocks rejected due to conditional moves");
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Statistic<> SBResourceConstraint("modulosched-resourceConstraint",
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"Loops constrained by resources");
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Statistic<> SBRecurrenceConstraint("modulosched-recurrenceConstraint",
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"Loops constrained by recurrences");
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Statistic<> SBFinalIISum("modulosched-finalIISum", "Sum of all final II");
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Statistic<> SBIISum("modulosched-IISum", "Sum of all theoretical II");
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Statistic<> SBMSLoops("modulosched-schedLoops", "Number of loops successfully modulo-scheduled");
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Statistic<> SBNoSched("modulosched-noSched", "No schedule");
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Statistic<> SBSameStage("modulosched-sameStage", "Max stage is 0");
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Statistic<> SBBLoops("modulosched-SBBLoops", "Number single basic block loops");
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Statistic<> SBInvalid("modulosched-SBInvalid", "Number invalid superblock loops");
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Statistic<> SBValid("modulosched-SBValid", "Number valid superblock loops");
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Statistic<> SBSize("modulosched-SBSize", "Total size of all valid superblocks");
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template<>
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struct DOTGraphTraits<MSchedGraphSB*> : public DefaultDOTGraphTraits {
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static std::string getGraphName(MSchedGraphSB *F) {
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return "Dependence Graph";
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}
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static std::string getNodeLabel(MSchedGraphSBNode *Node, MSchedGraphSB *Graph) {
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if(!Node->isPredicate()) {
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if (Node->getInst()) {
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std::stringstream ss;
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ss << *(Node->getInst());
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return ss.str(); //((MachineInstr*)Node->getInst());
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}
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else
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return "No Inst";
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}
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else
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return "Pred Node";
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}
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static std::string getEdgeSourceLabel(MSchedGraphSBNode *Node,
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MSchedGraphSBNode::succ_iterator I) {
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//Label each edge with the type of dependence
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std::string edgelabel = "";
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switch (I.getEdge().getDepOrderType()) {
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case MSchedGraphSBEdge::TrueDep:
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edgelabel = "True";
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break;
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case MSchedGraphSBEdge::AntiDep:
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edgelabel = "Anti";
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break;
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case MSchedGraphSBEdge::OutputDep:
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edgelabel = "Output";
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break;
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case MSchedGraphSBEdge::NonDataDep:
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edgelabel = "Pred";
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break;
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default:
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edgelabel = "Unknown";
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break;
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}
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//FIXME
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int iteDiff = I.getEdge().getIteDiff();
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std::string intStr = "(IteDiff: ";
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intStr += itostr(iteDiff);
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intStr += ")";
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edgelabel += intStr;
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return edgelabel;
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}
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};
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bool ModuloSchedulingSBPass::runOnFunction(Function &F) {
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bool Changed = false;
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//Get MachineFunction
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MachineFunction &MF = MachineFunction::get(&F);
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//Get Loop Info & Dependence Anaysis info
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LoopInfo &LI = getAnalysis<LoopInfo>();
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DependenceAnalyzer &DA = getAnalysis<DependenceAnalyzer>();
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//Worklist of superblocks
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std::vector<std::vector<const MachineBasicBlock*> > Worklist;
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FindSuperBlocks(F, LI, Worklist);
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DEBUG(if(Worklist.size() == 0) std::cerr << "No superblocks in function to ModuloSchedule\n");
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//Loop over worklist and ModuloSchedule each SuperBlock
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for(std::vector<std::vector<const MachineBasicBlock*> >::iterator SB = Worklist.begin(),
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SBE = Worklist.end(); SB != SBE; ++SB) {
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//Print out Superblock
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DEBUG(std::cerr << "ModuloScheduling SB: \n";
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for(std::vector<const MachineBasicBlock*>::const_iterator BI = SB->begin(),
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BE = SB->end(); BI != BE; ++BI) {
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(*BI)->print(std::cerr);});
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if(!CreateDefMap(*SB)) {
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defaultInst = 0;
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defMap.clear();
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continue;
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}
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MSchedGraphSB *MSG = new MSchedGraphSB(*SB, target, indVarInstrs[*SB], DA,
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machineTollvm[*SB]);
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//Write Graph out to file
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DEBUG(WriteGraphToFileSB(std::cerr, F.getName(), MSG));
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//Calculate Resource II
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int ResMII = calculateResMII(*SB);
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//Calculate Recurrence II
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int RecMII = calculateRecMII(MSG, ResMII);
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DEBUG(std::cerr << "Number of reccurrences found: " << recurrenceList.size() << "\n");
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//Our starting initiation interval is the maximum of RecMII and ResMII
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if(RecMII < ResMII)
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++SBRecurrenceConstraint;
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else
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++SBResourceConstraint;
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II = std::max(RecMII, ResMII);
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int mII = II;
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//Print out II, RecMII, and ResMII
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DEBUG(std::cerr << "II starts out as " << II << " ( RecMII=" << RecMII << " and ResMII=" << ResMII << ")\n");
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//Calculate Node Properties
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calculateNodeAttributes(MSG, ResMII);
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//Dump node properties if in debug mode
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DEBUG(for(std::map<MSchedGraphSBNode*, MSNodeSBAttributes>::iterator I = nodeToAttributesMap.begin(),
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E = nodeToAttributesMap.end(); I !=E; ++I) {
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std::cerr << "Node: " << *(I->first) << " ASAP: " << I->second.ASAP << " ALAP: "
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<< I->second.ALAP << " MOB: " << I->second.MOB << " Depth: " << I->second.depth
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<< " Height: " << I->second.height << "\n";
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});
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//Put nodes in order to schedule them
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computePartialOrder();
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//Dump out partial order
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DEBUG(for(std::vector<std::set<MSchedGraphSBNode*> >::iterator I = partialOrder.begin(),
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E = partialOrder.end(); I !=E; ++I) {
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std::cerr << "Start set in PO\n";
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for(std::set<MSchedGraphSBNode*>::iterator J = I->begin(), JE = I->end(); J != JE; ++J)
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std::cerr << "PO:" << **J << "\n";
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});
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//Place nodes in final order
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orderNodes();
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//Dump out order of nodes
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DEBUG(for(std::vector<MSchedGraphSBNode*>::iterator I = FinalNodeOrder.begin(), E = FinalNodeOrder.end(); I != E; ++I) {
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std::cerr << "FO:" << **I << "\n";
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});
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//Finally schedule nodes
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bool haveSched = computeSchedule(*SB, MSG);
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//Print out final schedule
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DEBUG(schedule.print(std::cerr));
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//Final scheduling step is to reconstruct the loop only if we actual have
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//stage > 0
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if(haveSched) {
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//schedule.printSchedule(std::cerr);
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reconstructLoop(*SB);
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++SBMSLoops;
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//Changed = true;
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SBIISum += mII;
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SBFinalIISum += II;
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if(schedule.getMaxStage() == 0)
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++SBSameStage;
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}
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else
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++SBNoSched;
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//Clear out our maps for the next basic block that is processed
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nodeToAttributesMap.clear();
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partialOrder.clear();
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recurrenceList.clear();
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FinalNodeOrder.clear();
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schedule.clear();
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defMap.clear();
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}
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return Changed;
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}
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void ModuloSchedulingSBPass::FindSuperBlocks(Function &F, LoopInfo &LI,
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std::vector<std::vector<const MachineBasicBlock*> > &Worklist) {
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//Get MachineFunction
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MachineFunction &MF = MachineFunction::get(&F);
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//Map of LLVM BB to machine BB
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std::map<BasicBlock*, MachineBasicBlock*> bbMap;
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for (MachineFunction::iterator BI = MF.begin(); BI != MF.end(); ++BI) {
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BasicBlock *llvmBB = (BasicBlock*) BI->getBasicBlock();
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assert(!bbMap.count(llvmBB) && "LLVM BB already in map!");
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bbMap[llvmBB] = &*BI;
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}
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//Iterate over the loops, and find super blocks
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for(LoopInfo::iterator LB = LI.begin(), LE = LI.end(); LB != LE; ++LB) {
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Loop *L = *LB;
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++NumLoops;
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//If loop is not single entry, try the next one
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if(!L->getLoopPreheader())
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continue;
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//Check size of this loop, we don't want SBB loops
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if(L->getBlocks().size() == 1)
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continue;
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//Check if this loop contains no sub loops
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if(L->getSubLoops().size() == 0) {
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std::vector<const MachineBasicBlock*> superBlock;
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//Get Loop Headers
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BasicBlock *header = L->getHeader();
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//Follow the header and make sure each BB only has one entry and is valid
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BasicBlock *current = header;
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assert(bbMap.count(current) && "LLVM BB must have corresponding Machine BB\n");
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MachineBasicBlock *currentMBB = bbMap[header];
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bool done = false;
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bool success = true;
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unsigned offset = 0;
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std::map<const MachineInstr*, unsigned> indexMap;
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while(!done) {
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//Loop over successors of this BB, they should be in the
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//loop block and be valid
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BasicBlock *next = 0;
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for(succ_iterator I = succ_begin(current), E = succ_end(current);
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I != E; ++I) {
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if(L->contains(*I)) {
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if(!next)
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next = *I;
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else {
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done = true;
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success = false;
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break;
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}
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}
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}
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if(success) {
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superBlock.push_back(currentMBB);
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if(next == header)
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done = true;
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else if(!next->getSinglePredecessor()) {
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done = true;
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success = false;
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}
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else {
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//Check that the next BB only has one entry
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current = next;
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assert(bbMap.count(current) && "LLVM BB must have corresponding Machine BB");
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currentMBB = bbMap[current];
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}
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}
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}
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if(success) {
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++NumSB;
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//Loop over all the blocks in the superblock
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for(std::vector<const MachineBasicBlock*>::iterator currentMBB = superBlock.begin(), MBBEnd = superBlock.end(); currentMBB != MBBEnd; ++currentMBB) {
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if(!MachineBBisValid(*currentMBB, indexMap, offset)) {
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success = false;
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break;
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}
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}
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}
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if(success) {
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if(getIndVar(superBlock, bbMap, indexMap)) {
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++SBValid;
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Worklist.push_back(superBlock);
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SBSize += superBlock.size();
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}
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else
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++SBInvalid;
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}
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}
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}
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}
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bool ModuloSchedulingSBPass::getIndVar(std::vector<const MachineBasicBlock*> &superBlock, std::map<BasicBlock*, MachineBasicBlock*> &bbMap,
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std::map<const MachineInstr*, unsigned> &indexMap) {
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//See if we can get induction var instructions
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std::set<const BasicBlock*> llvmSuperBlock;
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for(unsigned i =0; i < superBlock.size(); ++i)
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llvmSuperBlock.insert(superBlock[i]->getBasicBlock());
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//Get Target machine instruction info
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const TargetInstrInfo *TMI = target.getInstrInfo();
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//Get the loop back branch
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BranchInst *b = dyn_cast<BranchInst>(((BasicBlock*) (superBlock[superBlock.size()-1])->getBasicBlock())->getTerminator());
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std::set<Instruction*> indVar;
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if(b->isConditional()) {
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//Get the condition for the branch
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Value *cond = b->getCondition();
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DEBUG(std::cerr << "Condition: " << *cond << "\n");
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//List of instructions associated with induction variable
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std::vector<Instruction*> stack;
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//Add branch
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indVar.insert(b);
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if(Instruction *I = dyn_cast<Instruction>(cond))
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if(bbMap.count(I->getParent())) {
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if (!assocIndVar(I, indVar, stack, bbMap, superBlock[(superBlock.size()-1)]->getBasicBlock(), llvmSuperBlock))
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return false;
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}
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else
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return false;
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else
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return false;
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}
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else {
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indVar.insert(b);
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}
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//Dump out instructions associate with indvar for debug reasons
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DEBUG(for(std::set<Instruction*>::iterator N = indVar.begin(), NE = indVar.end();
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N != NE; ++N) {
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std::cerr << **N << "\n";
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});
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//Create map of machine instr to llvm instr
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std::map<MachineInstr*, Instruction*> mllvm;
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for(std::vector<const MachineBasicBlock*>::iterator MBB = superBlock.begin(), MBE = superBlock.end(); MBB != MBE; ++MBB) {
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BasicBlock *BB = (BasicBlock*) (*MBB)->getBasicBlock();
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for(BasicBlock::iterator I = BB->begin(), E = BB->end(); I != E; ++I) {
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MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(I);
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for (unsigned j = 0; j < tempMvec.size(); j++) {
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mllvm[tempMvec[j]] = I;
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}
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}
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}
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//Convert list of LLVM Instructions to list of Machine instructions
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std::map<const MachineInstr*, unsigned> mIndVar;
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for(std::set<Instruction*>::iterator N = indVar.begin(),
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NE = indVar.end(); N != NE; ++N) {
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//If we have a load, we can't handle this loop because
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//there is no way to preserve dependences between loads
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//and stores
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if(isa<LoadInst>(*N))
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return false;
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MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(*N);
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for (unsigned j = 0; j < tempMvec.size(); j++) {
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MachineOpCode OC = (tempMvec[j])->getOpcode();
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if(TMI->isNop(OC))
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continue;
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if(!indexMap.count(tempMvec[j]))
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continue;
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mIndVar[(MachineInstr*) tempMvec[j]] = indexMap[(MachineInstr*) tempMvec[j]];
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DEBUG(std::cerr << *(tempMvec[j]) << " at index " << indexMap[(MachineInstr*) tempMvec[j]] << "\n");
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}
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}
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//Put into a map for future access
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indVarInstrs[superBlock] = mIndVar;
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machineTollvm[superBlock] = mllvm;
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return true;
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}
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bool ModuloSchedulingSBPass::assocIndVar(Instruction *I,
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std::set<Instruction*> &indVar,
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std::vector<Instruction*> &stack,
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std::map<BasicBlock*, MachineBasicBlock*> &bbMap,
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const BasicBlock *last, std::set<const BasicBlock*> &llvmSuperBlock) {
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stack.push_back(I);
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//If this is a phi node, check if its the canonical indvar
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if(PHINode *PN = dyn_cast<PHINode>(I)) {
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if(llvmSuperBlock.count(PN->getParent())) {
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if (Instruction *Inc =
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dyn_cast<Instruction>(PN->getIncomingValueForBlock(last)))
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if (Inc->getOpcode() == Instruction::Add && Inc->getOperand(0) == PN)
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if (ConstantInt *CI = dyn_cast<ConstantInt>(Inc->getOperand(1)))
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if (CI->equalsInt(1)) {
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//We have found the indvar, so add the stack, and inc instruction to the set
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indVar.insert(stack.begin(), stack.end());
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indVar.insert(Inc);
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stack.pop_back();
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return true;
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}
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return false;
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}
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}
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else {
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//Loop over each of the instructions operands, check if they are an instruction and in this BB
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for(unsigned i = 0; i < I->getNumOperands(); ++i) {
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if(Instruction *N = dyn_cast<Instruction>(I->getOperand(i))) {
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|
if(bbMap.count(N->getParent()))
|
|
if(!assocIndVar(N, indVar, stack, bbMap, last, llvmSuperBlock))
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
stack.pop_back();
|
|
return true;
|
|
}
|
|
|
|
|
|
/// This function checks if a Machine Basic Block is valid for modulo
|
|
/// scheduling. This means that it has no control flow (if/else or
|
|
/// calls) in the block. Currently ModuloScheduling only works on
|
|
/// single basic block loops.
|
|
bool ModuloSchedulingSBPass::MachineBBisValid(const MachineBasicBlock *BI,
|
|
std::map<const MachineInstr*, unsigned> &indexMap,
|
|
unsigned &offset) {
|
|
|
|
//Check size of our basic block.. make sure we have more then just the terminator in it
|
|
if(BI->getBasicBlock()->size() == 1)
|
|
return false;
|
|
|
|
//Get Target machine instruction info
|
|
const TargetInstrInfo *TMI = target.getInstrInfo();
|
|
|
|
unsigned count = 0;
|
|
for(MachineBasicBlock::const_iterator I = BI->begin(), E = BI->end(); I != E; ++I) {
|
|
//Get opcode to check instruction type
|
|
MachineOpCode OC = I->getOpcode();
|
|
|
|
//Look for calls
|
|
if(TMI->isCall(OC)) {
|
|
++BBWithCalls;
|
|
return false;
|
|
}
|
|
|
|
//Look for conditional move
|
|
if(OC == V9::MOVRZr || OC == V9::MOVRZi || OC == V9::MOVRLEZr || OC == V9::MOVRLEZi
|
|
|| OC == V9::MOVRLZr || OC == V9::MOVRLZi || OC == V9::MOVRNZr || OC == V9::MOVRNZi
|
|
|| OC == V9::MOVRGZr || OC == V9::MOVRGZi || OC == V9::MOVRGEZr
|
|
|| OC == V9::MOVRGEZi || OC == V9::MOVLEr || OC == V9::MOVLEi || OC == V9::MOVLEUr
|
|
|| OC == V9::MOVLEUi || OC == V9::MOVFLEr || OC == V9::MOVFLEi
|
|
|| OC == V9::MOVNEr || OC == V9::MOVNEi || OC == V9::MOVNEGr || OC == V9::MOVNEGi
|
|
|| OC == V9::MOVFNEr || OC == V9::MOVFNEi) {
|
|
++BBWithCondMov;
|
|
return false;
|
|
}
|
|
|
|
indexMap[I] = count + offset;
|
|
|
|
if(TMI->isNop(OC))
|
|
continue;
|
|
|
|
++count;
|
|
}
|
|
|
|
offset += count;
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
bool ModuloSchedulingSBPass::CreateDefMap(std::vector<const MachineBasicBlock*> &SB) {
|
|
defaultInst = 0;
|
|
|
|
for(std::vector<const MachineBasicBlock*>::iterator BI = SB.begin(),
|
|
BE = SB.end(); BI != BE; ++BI) {
|
|
|
|
for(MachineBasicBlock::const_iterator I = (*BI)->begin(), E = (*BI)->end(); I != E; ++I) {
|
|
for(unsigned opNum = 0; opNum < I->getNumOperands(); ++opNum) {
|
|
const MachineOperand &mOp = I->getOperand(opNum);
|
|
if(mOp.getType() == MachineOperand::MO_VirtualRegister && mOp.isDef()) {
|
|
Value *V = mOp.getVRegValue();
|
|
//assert if this is the second def we have seen
|
|
if(defMap.count(V) && isa<PHINode>(V))
|
|
DEBUG(std::cerr << "FIXME: Dup def for phi!\n");
|
|
else {
|
|
//assert(!defMap.count(V) && "Def already in the map");
|
|
if(defMap.count(V))
|
|
return false;
|
|
defMap[V] = (MachineInstr*) &*I;
|
|
}
|
|
}
|
|
|
|
//See if we can use this Value* as our defaultInst
|
|
if(!defaultInst && mOp.getType() == MachineOperand::MO_VirtualRegister) {
|
|
Value *V = mOp.getVRegValue();
|
|
if(!isa<TmpInstruction>(V) && !isa<Argument>(V) && !isa<Constant>(V) && !isa<PHINode>(V))
|
|
defaultInst = (Instruction*) V;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if(!defaultInst)
|
|
return false;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
|
//ResMII is calculated by determining the usage count for each resource
|
|
//and using the maximum.
|
|
//FIXME: In future there should be a way to get alternative resources
|
|
//for each instruction
|
|
int ModuloSchedulingSBPass::calculateResMII(std::vector<const MachineBasicBlock*> &superBlock) {
|
|
|
|
TIME_REGION(X, "calculateResMII");
|
|
|
|
const TargetInstrInfo *mii = target.getInstrInfo();
|
|
const TargetSchedInfo *msi = target.getSchedInfo();
|
|
|
|
int ResMII = 0;
|
|
|
|
//Map to keep track of usage count of each resource
|
|
std::map<unsigned, unsigned> resourceUsageCount;
|
|
|
|
for(std::vector<const MachineBasicBlock*>::iterator BI = superBlock.begin(), BE = superBlock.end(); BI != BE; ++BI) {
|
|
for(MachineBasicBlock::const_iterator I = (*BI)->begin(), E = (*BI)->end(); I != E; ++I) {
|
|
|
|
//Get resource usage for this instruction
|
|
InstrRUsage rUsage = msi->getInstrRUsage(I->getOpcode());
|
|
std::vector<std::vector<resourceId_t> > resources = rUsage.resourcesByCycle;
|
|
|
|
//Loop over resources in each cycle and increments their usage count
|
|
for(unsigned i=0; i < resources.size(); ++i)
|
|
for(unsigned j=0; j < resources[i].size(); ++j) {
|
|
if(!resourceUsageCount.count(resources[i][j])) {
|
|
resourceUsageCount[resources[i][j]] = 1;
|
|
}
|
|
else {
|
|
resourceUsageCount[resources[i][j]] = resourceUsageCount[resources[i][j]] + 1;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//Find maximum usage count
|
|
|
|
//Get max number of instructions that can be issued at once. (FIXME)
|
|
int issueSlots = msi->maxNumIssueTotal;
|
|
|
|
for(std::map<unsigned,unsigned>::iterator RB = resourceUsageCount.begin(), RE = resourceUsageCount.end(); RB != RE; ++RB) {
|
|
|
|
//Get the total number of the resources in our cpu
|
|
int resourceNum = CPUResource::getCPUResource(RB->first)->maxNumUsers;
|
|
|
|
//Get total usage count for this resources
|
|
unsigned usageCount = RB->second;
|
|
|
|
//Divide the usage count by either the max number we can issue or the number of
|
|
//resources (whichever is its upper bound)
|
|
double finalUsageCount;
|
|
DEBUG(std::cerr << "Resource Num: " << RB->first << " Usage: " << usageCount << " TotalNum: " << resourceNum << "\n");
|
|
|
|
if( resourceNum <= issueSlots)
|
|
finalUsageCount = ceil(1.0 * usageCount / resourceNum);
|
|
else
|
|
finalUsageCount = ceil(1.0 * usageCount / issueSlots);
|
|
|
|
|
|
//Only keep track of the max
|
|
ResMII = std::max( (int) finalUsageCount, ResMII);
|
|
|
|
}
|
|
|
|
return ResMII;
|
|
|
|
}
|
|
|
|
/// calculateRecMII - Calculates the value of the highest recurrence
|
|
/// By value we mean the total latency/distance
|
|
int ModuloSchedulingSBPass::calculateRecMII(MSchedGraphSB *graph, int MII) {
|
|
|
|
TIME_REGION(X, "calculateRecMII");
|
|
|
|
findAllCircuits(graph, MII);
|
|
int RecMII = 0;
|
|
|
|
for(std::set<std::pair<int, std::vector<MSchedGraphSBNode*> > >::iterator I = recurrenceList.begin(), E=recurrenceList.end(); I !=E; ++I) {
|
|
RecMII = std::max(RecMII, I->first);
|
|
}
|
|
|
|
return MII;
|
|
}
|
|
|
|
int CircCountSB;
|
|
|
|
void ModuloSchedulingSBPass::unblock(MSchedGraphSBNode *u, std::set<MSchedGraphSBNode*> &blocked,
|
|
std::map<MSchedGraphSBNode*, std::set<MSchedGraphSBNode*> > &B) {
|
|
|
|
//Unblock u
|
|
DEBUG(std::cerr << "Unblocking: " << *u << "\n");
|
|
blocked.erase(u);
|
|
|
|
//std::set<MSchedGraphSBNode*> toErase;
|
|
while (!B[u].empty()) {
|
|
MSchedGraphSBNode *W = *B[u].begin();
|
|
B[u].erase(W);
|
|
//toErase.insert(*W);
|
|
DEBUG(std::cerr << "Removed: " << *W << "from B-List\n");
|
|
if(blocked.count(W))
|
|
unblock(W, blocked, B);
|
|
}
|
|
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::addSCC(std::vector<MSchedGraphSBNode*> &SCC, std::map<MSchedGraphSBNode*, MSchedGraphSBNode*> &newNodes) {
|
|
|
|
int totalDelay = 0;
|
|
int totalDistance = 0;
|
|
std::vector<MSchedGraphSBNode*> recc;
|
|
MSchedGraphSBNode *start = 0;
|
|
MSchedGraphSBNode *end = 0;
|
|
|
|
//Loop over recurrence, get delay and distance
|
|
for(std::vector<MSchedGraphSBNode*>::iterator N = SCC.begin(), NE = SCC.end(); N != NE; ++N) {
|
|
DEBUG(std::cerr << **N << "\n");
|
|
totalDelay += (*N)->getLatency();
|
|
|
|
for(unsigned i = 0; i < (*N)->succ_size(); ++i) {
|
|
MSchedGraphSBEdge *edge = (*N)->getSuccessor(i);
|
|
if(find(SCC.begin(), SCC.end(), edge->getDest()) != SCC.end()) {
|
|
totalDistance += edge->getIteDiff();
|
|
if(edge->getIteDiff() > 0)
|
|
if(!start && !end) {
|
|
start = *N;
|
|
end = edge->getDest();
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
|
|
//Get the original node
|
|
recc.push_back(newNodes[*N]);
|
|
|
|
|
|
}
|
|
|
|
DEBUG(std::cerr << "End Recc\n");
|
|
|
|
|
|
assert( (start && end) && "Must have start and end node to ignore edge for SCC");
|
|
|
|
if(start && end) {
|
|
//Insert reccurrence into the list
|
|
DEBUG(std::cerr << "Ignore Edge from!!: " << *start << " to " << *end << "\n");
|
|
edgesToIgnore.insert(std::make_pair(newNodes[start], (newNodes[end])->getInEdgeNum(newNodes[start])));
|
|
}
|
|
|
|
int lastII = totalDelay / totalDistance;
|
|
|
|
|
|
recurrenceList.insert(std::make_pair(lastII, recc));
|
|
|
|
}
|
|
|
|
bool ModuloSchedulingSBPass::circuit(MSchedGraphSBNode *v, std::vector<MSchedGraphSBNode*> &stack,
|
|
std::set<MSchedGraphSBNode*> &blocked, std::vector<MSchedGraphSBNode*> &SCC,
|
|
MSchedGraphSBNode *s, std::map<MSchedGraphSBNode*, std::set<MSchedGraphSBNode*> > &B,
|
|
int II, std::map<MSchedGraphSBNode*, MSchedGraphSBNode*> &newNodes) {
|
|
bool f = false;
|
|
|
|
DEBUG(std::cerr << "Finding Circuits Starting with: ( " << v << ")"<< *v << "\n");
|
|
|
|
//Push node onto the stack
|
|
stack.push_back(v);
|
|
|
|
//block this node
|
|
blocked.insert(v);
|
|
|
|
//Loop over all successors of node v that are in the scc, create Adjaceny list
|
|
std::set<MSchedGraphSBNode*> AkV;
|
|
for(MSchedGraphSBNode::succ_iterator I = v->succ_begin(), E = v->succ_end(); I != E; ++I) {
|
|
if((std::find(SCC.begin(), SCC.end(), *I) != SCC.end())) {
|
|
AkV.insert(*I);
|
|
}
|
|
}
|
|
|
|
for(std::set<MSchedGraphSBNode*>::iterator I = AkV.begin(), E = AkV.end(); I != E; ++I) {
|
|
if(*I == s) {
|
|
//We have a circuit, so add it to our list
|
|
addRecc(stack, newNodes);
|
|
f = true;
|
|
}
|
|
else if(!blocked.count(*I)) {
|
|
if(circuit(*I, stack, blocked, SCC, s, B, II, newNodes))
|
|
f = true;
|
|
}
|
|
else
|
|
DEBUG(std::cerr << "Blocked: " << **I << "\n");
|
|
}
|
|
|
|
|
|
if(f) {
|
|
unblock(v, blocked, B);
|
|
}
|
|
else {
|
|
for(std::set<MSchedGraphSBNode*>::iterator I = AkV.begin(), E = AkV.end(); I != E; ++I)
|
|
B[*I].insert(v);
|
|
|
|
}
|
|
|
|
//Pop v
|
|
stack.pop_back();
|
|
|
|
return f;
|
|
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::addRecc(std::vector<MSchedGraphSBNode*> &stack, std::map<MSchedGraphSBNode*, MSchedGraphSBNode*> &newNodes) {
|
|
std::vector<MSchedGraphSBNode*> recc;
|
|
//Dump recurrence for now
|
|
DEBUG(std::cerr << "Starting Recc\n");
|
|
|
|
int totalDelay = 0;
|
|
int totalDistance = 0;
|
|
MSchedGraphSBNode *lastN = 0;
|
|
MSchedGraphSBNode *start = 0;
|
|
MSchedGraphSBNode *end = 0;
|
|
|
|
//Loop over recurrence, get delay and distance
|
|
for(std::vector<MSchedGraphSBNode*>::iterator N = stack.begin(), NE = stack.end(); N != NE; ++N) {
|
|
DEBUG(std::cerr << **N << "\n");
|
|
totalDelay += (*N)->getLatency();
|
|
if(lastN) {
|
|
int iteDiff = (*N)->getInEdge(lastN).getIteDiff();
|
|
totalDistance += iteDiff;
|
|
|
|
if(iteDiff > 0) {
|
|
start = lastN;
|
|
end = *N;
|
|
}
|
|
}
|
|
//Get the original node
|
|
lastN = *N;
|
|
recc.push_back(newNodes[*N]);
|
|
|
|
|
|
}
|
|
|
|
//Get the loop edge
|
|
totalDistance += lastN->getIteDiff(*stack.begin());
|
|
|
|
DEBUG(std::cerr << "End Recc\n");
|
|
CircCountSB++;
|
|
|
|
if(start && end) {
|
|
//Insert reccurrence into the list
|
|
DEBUG(std::cerr << "Ignore Edge from!!: " << *start << " to " << *end << "\n");
|
|
edgesToIgnore.insert(std::make_pair(newNodes[start], (newNodes[end])->getInEdgeNum(newNodes[start])));
|
|
}
|
|
else {
|
|
//Insert reccurrence into the list
|
|
DEBUG(std::cerr << "Ignore Edge from: " << *lastN << " to " << **stack.begin() << "\n");
|
|
edgesToIgnore.insert(std::make_pair(newNodes[lastN], newNodes[(*stack.begin())]->getInEdgeNum(newNodes[lastN])));
|
|
|
|
}
|
|
//Adjust II until we get close to the inequality delay - II*distance <= 0
|
|
int RecMII = II; //Starting value
|
|
int value = totalDelay-(RecMII * totalDistance);
|
|
int lastII = II;
|
|
while(value < 0) {
|
|
|
|
lastII = RecMII;
|
|
RecMII--;
|
|
value = totalDelay-(RecMII * totalDistance);
|
|
}
|
|
|
|
recurrenceList.insert(std::make_pair(lastII, recc));
|
|
|
|
}
|
|
|
|
|
|
void ModuloSchedulingSBPass::findAllCircuits(MSchedGraphSB *g, int II) {
|
|
|
|
CircCountSB = 0;
|
|
|
|
//Keep old to new node mapping information
|
|
std::map<MSchedGraphSBNode*, MSchedGraphSBNode*> newNodes;
|
|
|
|
//copy the graph
|
|
MSchedGraphSB *MSG = new MSchedGraphSB(*g, newNodes);
|
|
|
|
DEBUG(std::cerr << "Finding All Circuits\n");
|
|
|
|
//Set of blocked nodes
|
|
std::set<MSchedGraphSBNode*> blocked;
|
|
|
|
//Stack holding current circuit
|
|
std::vector<MSchedGraphSBNode*> stack;
|
|
|
|
//Map for B Lists
|
|
std::map<MSchedGraphSBNode*, std::set<MSchedGraphSBNode*> > B;
|
|
|
|
//current node
|
|
MSchedGraphSBNode *s;
|
|
|
|
|
|
//Iterate over the graph until its down to one node or empty
|
|
while(MSG->size() > 1) {
|
|
|
|
//Write Graph out to file
|
|
//WriteGraphToFile(std::cerr, "Graph" + utostr(MSG->size()), MSG);
|
|
|
|
DEBUG(std::cerr << "Graph Size: " << MSG->size() << "\n");
|
|
DEBUG(std::cerr << "Finding strong component Vk with least vertex\n");
|
|
|
|
//Iterate over all the SCCs in the graph
|
|
std::set<MSchedGraphSBNode*> Visited;
|
|
std::vector<MSchedGraphSBNode*> Vk;
|
|
MSchedGraphSBNode* s = 0;
|
|
int numEdges = 0;
|
|
|
|
//Find scc with the least vertex
|
|
for (MSchedGraphSB::iterator GI = MSG->begin(), E = MSG->end(); GI != E; ++GI)
|
|
if (Visited.insert(GI->second).second) {
|
|
for (scc_iterator<MSchedGraphSBNode*> SCCI = scc_begin(GI->second),
|
|
E = scc_end(GI->second); SCCI != E; ++SCCI) {
|
|
std::vector<MSchedGraphSBNode*> &nextSCC = *SCCI;
|
|
|
|
if (Visited.insert(nextSCC[0]).second) {
|
|
Visited.insert(nextSCC.begin()+1, nextSCC.end());
|
|
|
|
if(nextSCC.size() > 1) {
|
|
DEBUG(std::cerr << "SCC size: " << nextSCC.size() << "\n");
|
|
|
|
for(unsigned i = 0; i < nextSCC.size(); ++i) {
|
|
//Loop over successor and see if in scc, then count edge
|
|
MSchedGraphSBNode *node = nextSCC[i];
|
|
for(MSchedGraphSBNode::succ_iterator S = node->succ_begin(), SE = node->succ_end(); S != SE; ++S) {
|
|
if(find(nextSCC.begin(), nextSCC.end(), *S) != nextSCC.end())
|
|
numEdges++;
|
|
}
|
|
}
|
|
DEBUG(std::cerr << "Num Edges: " << numEdges << "\n");
|
|
}
|
|
|
|
//Ignore self loops
|
|
if(nextSCC.size() > 1) {
|
|
|
|
//Get least vertex in Vk
|
|
if(!s) {
|
|
s = nextSCC[0];
|
|
Vk = nextSCC;
|
|
}
|
|
|
|
for(unsigned i = 0; i < nextSCC.size(); ++i) {
|
|
if(nextSCC[i] < s) {
|
|
s = nextSCC[i];
|
|
Vk = nextSCC;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//Process SCC
|
|
DEBUG(for(std::vector<MSchedGraphSBNode*>::iterator N = Vk.begin(), NE = Vk.end();
|
|
N != NE; ++N) { std::cerr << *((*N)->getInst()); });
|
|
|
|
//Iterate over all nodes in this scc
|
|
for(std::vector<MSchedGraphSBNode*>::iterator N = Vk.begin(), NE = Vk.end();
|
|
N != NE; ++N) {
|
|
blocked.erase(*N);
|
|
B[*N].clear();
|
|
}
|
|
if(Vk.size() > 1) {
|
|
if(numEdges < 98)
|
|
circuit(s, stack, blocked, Vk, s, B, II, newNodes);
|
|
else
|
|
addSCC(Vk, newNodes);
|
|
|
|
|
|
//Delete nodes from the graph
|
|
//Find all nodes up to s and delete them
|
|
std::vector<MSchedGraphSBNode*> nodesToRemove;
|
|
nodesToRemove.push_back(s);
|
|
for(MSchedGraphSB::iterator N = MSG->begin(), NE = MSG->end(); N != NE; ++N) {
|
|
if(N->second < s )
|
|
nodesToRemove.push_back(N->second);
|
|
}
|
|
for(std::vector<MSchedGraphSBNode*>::iterator N = nodesToRemove.begin(), NE = nodesToRemove.end(); N != NE; ++N) {
|
|
DEBUG(std::cerr << "Deleting Node: " << **N << "\n");
|
|
MSG->deleteNode(*N);
|
|
}
|
|
}
|
|
else
|
|
break;
|
|
}
|
|
DEBUG(std::cerr << "Num Circuits found: " << CircCountSB << "\n");
|
|
}
|
|
/// calculateNodeAttributes - The following properties are calculated for
|
|
/// each node in the dependence graph: ASAP, ALAP, Depth, Height, and
|
|
/// MOB.
|
|
void ModuloSchedulingSBPass::calculateNodeAttributes(MSchedGraphSB *graph, int MII) {
|
|
|
|
TIME_REGION(X, "calculateNodeAttributes");
|
|
|
|
assert(nodeToAttributesMap.empty() && "Node attribute map was not cleared");
|
|
|
|
//Loop over the nodes and add them to the map
|
|
for(MSchedGraphSB::iterator I = graph->begin(), E = graph->end(); I != E; ++I) {
|
|
|
|
DEBUG(std::cerr << "Inserting node into attribute map: " << *I->second << "\n");
|
|
|
|
//Assert if its already in the map
|
|
assert(nodeToAttributesMap.count(I->second) == 0 &&
|
|
"Node attributes are already in the map");
|
|
|
|
//Put into the map with default attribute values
|
|
nodeToAttributesMap[I->second] = MSNodeSBAttributes();
|
|
}
|
|
|
|
//Create set to deal with reccurrences
|
|
std::set<MSchedGraphSBNode*> visitedNodes;
|
|
|
|
//Now Loop over map and calculate the node attributes
|
|
for(std::map<MSchedGraphSBNode*, MSNodeSBAttributes>::iterator I = nodeToAttributesMap.begin(), E = nodeToAttributesMap.end(); I != E; ++I) {
|
|
calculateASAP(I->first, MII, (MSchedGraphSBNode*) 0);
|
|
visitedNodes.clear();
|
|
}
|
|
|
|
int maxASAP = findMaxASAP();
|
|
//Calculate ALAP which depends on ASAP being totally calculated
|
|
for(std::map<MSchedGraphSBNode*, MSNodeSBAttributes>::iterator I = nodeToAttributesMap.begin(), E = nodeToAttributesMap.end(); I != E; ++I) {
|
|
calculateALAP(I->first, MII, maxASAP, (MSchedGraphSBNode*) 0);
|
|
visitedNodes.clear();
|
|
}
|
|
|
|
//Calculate MOB which depends on ASAP being totally calculated, also do depth and height
|
|
for(std::map<MSchedGraphSBNode*, MSNodeSBAttributes>::iterator I = nodeToAttributesMap.begin(), E = nodeToAttributesMap.end(); I != E; ++I) {
|
|
(I->second).MOB = std::max(0,(I->second).ALAP - (I->second).ASAP);
|
|
|
|
DEBUG(std::cerr << "MOB: " << (I->second).MOB << " (" << *(I->first) << ")\n");
|
|
calculateDepth(I->first, (MSchedGraphSBNode*) 0);
|
|
calculateHeight(I->first, (MSchedGraphSBNode*) 0);
|
|
}
|
|
|
|
|
|
}
|
|
|
|
/// ignoreEdge - Checks to see if this edge of a recurrence should be ignored or not
|
|
bool ModuloSchedulingSBPass::ignoreEdge(MSchedGraphSBNode *srcNode, MSchedGraphSBNode *destNode) {
|
|
if(destNode == 0 || srcNode ==0)
|
|
return false;
|
|
|
|
bool findEdge = edgesToIgnore.count(std::make_pair(srcNode, destNode->getInEdgeNum(srcNode)));
|
|
|
|
DEBUG(std::cerr << "Ignoring edge? from: " << *srcNode << " to " << *destNode << "\n");
|
|
|
|
return findEdge;
|
|
}
|
|
|
|
|
|
/// calculateASAP - Calculates the
|
|
int ModuloSchedulingSBPass::calculateASAP(MSchedGraphSBNode *node, int MII, MSchedGraphSBNode *destNode) {
|
|
|
|
DEBUG(std::cerr << "Calculating ASAP for " << *node << "\n");
|
|
|
|
//Get current node attributes
|
|
MSNodeSBAttributes &attributes = nodeToAttributesMap.find(node)->second;
|
|
|
|
if(attributes.ASAP != -1)
|
|
return attributes.ASAP;
|
|
|
|
int maxPredValue = 0;
|
|
|
|
//Iterate over all of the predecessors and find max
|
|
for(MSchedGraphSBNode::pred_iterator P = node->pred_begin(), E = node->pred_end(); P != E; ++P) {
|
|
|
|
//Only process if we are not ignoring the edge
|
|
if(!ignoreEdge(*P, node)) {
|
|
int predASAP = -1;
|
|
predASAP = calculateASAP(*P, MII, node);
|
|
|
|
assert(predASAP != -1 && "ASAP has not been calculated");
|
|
int iteDiff = node->getInEdge(*P).getIteDiff();
|
|
|
|
int currentPredValue = predASAP + (*P)->getLatency() - (iteDiff * MII);
|
|
DEBUG(std::cerr << "pred ASAP: " << predASAP << ", iteDiff: " << iteDiff << ", PredLatency: " << (*P)->getLatency() << ", Current ASAP pred: " << currentPredValue << "\n");
|
|
maxPredValue = std::max(maxPredValue, currentPredValue);
|
|
}
|
|
}
|
|
|
|
attributes.ASAP = maxPredValue;
|
|
|
|
DEBUG(std::cerr << "ASAP: " << attributes.ASAP << " (" << *node << ")\n");
|
|
|
|
return maxPredValue;
|
|
}
|
|
|
|
|
|
int ModuloSchedulingSBPass::calculateALAP(MSchedGraphSBNode *node, int MII,
|
|
int maxASAP, MSchedGraphSBNode *srcNode) {
|
|
|
|
DEBUG(std::cerr << "Calculating ALAP for " << *node << "\n");
|
|
|
|
MSNodeSBAttributes &attributes = nodeToAttributesMap.find(node)->second;
|
|
|
|
if(attributes.ALAP != -1)
|
|
return attributes.ALAP;
|
|
|
|
if(node->hasSuccessors()) {
|
|
|
|
//Trying to deal with the issue where the node has successors, but
|
|
//we are ignoring all of the edges to them. So this is my hack for
|
|
//now.. there is probably a more elegant way of doing this (FIXME)
|
|
bool processedOneEdge = false;
|
|
|
|
//FIXME, set to something high to start
|
|
int minSuccValue = 9999999;
|
|
|
|
//Iterate over all of the predecessors and fine max
|
|
for(MSchedGraphSBNode::succ_iterator P = node->succ_begin(),
|
|
E = node->succ_end(); P != E; ++P) {
|
|
|
|
//Only process if we are not ignoring the edge
|
|
if(!ignoreEdge(node, *P)) {
|
|
processedOneEdge = true;
|
|
int succALAP = -1;
|
|
succALAP = calculateALAP(*P, MII, maxASAP, node);
|
|
|
|
assert(succALAP != -1 && "Successors ALAP should have been caclulated");
|
|
|
|
int iteDiff = P.getEdge().getIteDiff();
|
|
|
|
int currentSuccValue = succALAP - node->getLatency() + iteDiff * MII;
|
|
|
|
DEBUG(std::cerr << "succ ALAP: " << succALAP << ", iteDiff: " << iteDiff << ", SuccLatency: " << (*P)->getLatency() << ", Current ALAP succ: " << currentSuccValue << "\n");
|
|
|
|
minSuccValue = std::min(minSuccValue, currentSuccValue);
|
|
}
|
|
}
|
|
|
|
if(processedOneEdge)
|
|
attributes.ALAP = minSuccValue;
|
|
|
|
else
|
|
attributes.ALAP = maxASAP;
|
|
}
|
|
else
|
|
attributes.ALAP = maxASAP;
|
|
|
|
DEBUG(std::cerr << "ALAP: " << attributes.ALAP << " (" << *node << ")\n");
|
|
|
|
if(attributes.ALAP < 0)
|
|
attributes.ALAP = 0;
|
|
|
|
return attributes.ALAP;
|
|
}
|
|
|
|
int ModuloSchedulingSBPass::findMaxASAP() {
|
|
int maxASAP = 0;
|
|
|
|
for(std::map<MSchedGraphSBNode*, MSNodeSBAttributes>::iterator I = nodeToAttributesMap.begin(),
|
|
E = nodeToAttributesMap.end(); I != E; ++I)
|
|
maxASAP = std::max(maxASAP, I->second.ASAP);
|
|
return maxASAP;
|
|
}
|
|
|
|
|
|
int ModuloSchedulingSBPass::calculateHeight(MSchedGraphSBNode *node,MSchedGraphSBNode *srcNode) {
|
|
|
|
MSNodeSBAttributes &attributes = nodeToAttributesMap.find(node)->second;
|
|
|
|
if(attributes.height != -1)
|
|
return attributes.height;
|
|
|
|
int maxHeight = 0;
|
|
|
|
//Iterate over all of the predecessors and find max
|
|
for(MSchedGraphSBNode::succ_iterator P = node->succ_begin(),
|
|
E = node->succ_end(); P != E; ++P) {
|
|
|
|
|
|
if(!ignoreEdge(node, *P)) {
|
|
int succHeight = calculateHeight(*P, node);
|
|
|
|
assert(succHeight != -1 && "Successors Height should have been caclulated");
|
|
|
|
int currentHeight = succHeight + node->getLatency();
|
|
maxHeight = std::max(maxHeight, currentHeight);
|
|
}
|
|
}
|
|
attributes.height = maxHeight;
|
|
DEBUG(std::cerr << "Height: " << attributes.height << " (" << *node << ")\n");
|
|
return maxHeight;
|
|
}
|
|
|
|
|
|
int ModuloSchedulingSBPass::calculateDepth(MSchedGraphSBNode *node,
|
|
MSchedGraphSBNode *destNode) {
|
|
|
|
MSNodeSBAttributes &attributes = nodeToAttributesMap.find(node)->second;
|
|
|
|
if(attributes.depth != -1)
|
|
return attributes.depth;
|
|
|
|
int maxDepth = 0;
|
|
|
|
//Iterate over all of the predecessors and fine max
|
|
for(MSchedGraphSBNode::pred_iterator P = node->pred_begin(), E = node->pred_end(); P != E; ++P) {
|
|
|
|
if(!ignoreEdge(*P, node)) {
|
|
int predDepth = -1;
|
|
predDepth = calculateDepth(*P, node);
|
|
|
|
assert(predDepth != -1 && "Predecessors ASAP should have been caclulated");
|
|
|
|
int currentDepth = predDepth + (*P)->getLatency();
|
|
maxDepth = std::max(maxDepth, currentDepth);
|
|
}
|
|
}
|
|
attributes.depth = maxDepth;
|
|
|
|
DEBUG(std::cerr << "Depth: " << attributes.depth << " (" << *node << "*)\n");
|
|
return maxDepth;
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::computePartialOrder() {
|
|
|
|
TIME_REGION(X, "calculatePartialOrder");
|
|
|
|
DEBUG(std::cerr << "Computing Partial Order\n");
|
|
|
|
//Steps to add a recurrence to the partial order 1) Find reccurrence
|
|
//with the highest RecMII. Add it to the partial order. 2) For each
|
|
//recurrence with decreasing RecMII, add it to the partial order
|
|
//along with any nodes that connect this recurrence to recurrences
|
|
//already in the partial order
|
|
for(std::set<std::pair<int, std::vector<MSchedGraphSBNode*> > >::reverse_iterator
|
|
I = recurrenceList.rbegin(), E=recurrenceList.rend(); I !=E; ++I) {
|
|
|
|
std::set<MSchedGraphSBNode*> new_recurrence;
|
|
|
|
//Loop through recurrence and remove any nodes already in the partial order
|
|
for(std::vector<MSchedGraphSBNode*>::const_iterator N = I->second.begin(),
|
|
NE = I->second.end(); N != NE; ++N) {
|
|
|
|
bool found = false;
|
|
for(std::vector<std::set<MSchedGraphSBNode*> >::iterator PO = partialOrder.begin(),
|
|
PE = partialOrder.end(); PO != PE; ++PO) {
|
|
if(PO->count(*N))
|
|
found = true;
|
|
}
|
|
|
|
//Check if its a branch, and remove to handle special
|
|
if(!found) {
|
|
new_recurrence.insert(*N);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
if(new_recurrence.size() > 0) {
|
|
|
|
std::vector<MSchedGraphSBNode*> path;
|
|
std::set<MSchedGraphSBNode*> nodesToAdd;
|
|
|
|
//Dump recc we are dealing with (minus nodes already in PO)
|
|
DEBUG(std::cerr << "Recc: ");
|
|
DEBUG(for(std::set<MSchedGraphSBNode*>::iterator R = new_recurrence.begin(), RE = new_recurrence.end(); R != RE; ++R) { std::cerr << **R ; });
|
|
|
|
//Add nodes that connect this recurrence to recurrences in the partial path
|
|
for(std::set<MSchedGraphSBNode*>::iterator N = new_recurrence.begin(),
|
|
NE = new_recurrence.end(); N != NE; ++N)
|
|
searchPath(*N, path, nodesToAdd, new_recurrence);
|
|
|
|
//Add nodes to this recurrence if they are not already in the partial order
|
|
for(std::set<MSchedGraphSBNode*>::iterator N = nodesToAdd.begin(), NE = nodesToAdd.end();
|
|
N != NE; ++N) {
|
|
bool found = false;
|
|
for(std::vector<std::set<MSchedGraphSBNode*> >::iterator PO = partialOrder.begin(),
|
|
PE = partialOrder.end(); PO != PE; ++PO) {
|
|
if(PO->count(*N))
|
|
found = true;
|
|
}
|
|
if(!found) {
|
|
assert("FOUND CONNECTOR");
|
|
new_recurrence.insert(*N);
|
|
}
|
|
}
|
|
|
|
partialOrder.push_back(new_recurrence);
|
|
}
|
|
}
|
|
|
|
//Add any nodes that are not already in the partial order
|
|
//Add them in a set, one set per connected component
|
|
std::set<MSchedGraphSBNode*> lastNodes;
|
|
std::set<MSchedGraphSBNode*> noPredNodes;
|
|
for(std::map<MSchedGraphSBNode*, MSNodeSBAttributes>::iterator I = nodeToAttributesMap.begin(),
|
|
E = nodeToAttributesMap.end(); I != E; ++I) {
|
|
|
|
bool found = false;
|
|
|
|
//Check if its already in our partial order, if not add it to the final vector
|
|
for(std::vector<std::set<MSchedGraphSBNode*> >::iterator PO = partialOrder.begin(),
|
|
PE = partialOrder.end(); PO != PE; ++PO) {
|
|
if(PO->count(I->first))
|
|
found = true;
|
|
}
|
|
if(!found)
|
|
lastNodes.insert(I->first);
|
|
}
|
|
|
|
//For each node w/out preds, see if there is a path to one of the
|
|
//recurrences, and if so add them to that current recc
|
|
/*for(std::set<MSchedGraphSBNode*>::iterator N = noPredNodes.begin(), NE = noPredNodes.end();
|
|
N != NE; ++N) {
|
|
DEBUG(std::cerr << "No Pred Path from: " << **N << "\n");
|
|
for(std::vector<std::set<MSchedGraphSBNode*> >::iterator PO = partialOrder.begin(),
|
|
PE = partialOrder.end(); PO != PE; ++PO) {
|
|
std::vector<MSchedGraphSBNode*> path;
|
|
pathToRecc(*N, path, *PO, lastNodes);
|
|
}
|
|
}*/
|
|
|
|
|
|
//Break up remaining nodes that are not in the partial order
|
|
///into their connected compoenents
|
|
while(lastNodes.size() > 0) {
|
|
std::set<MSchedGraphSBNode*> ccSet;
|
|
connectedComponentSet(*(lastNodes.begin()),ccSet, lastNodes);
|
|
if(ccSet.size() > 0)
|
|
partialOrder.push_back(ccSet);
|
|
}
|
|
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::connectedComponentSet(MSchedGraphSBNode *node, std::set<MSchedGraphSBNode*> &ccSet, std::set<MSchedGraphSBNode*> &lastNodes) {
|
|
|
|
//Add to final set
|
|
if( !ccSet.count(node) && lastNodes.count(node)) {
|
|
lastNodes.erase(node);
|
|
ccSet.insert(node);
|
|
}
|
|
else
|
|
return;
|
|
|
|
//Loop over successors and recurse if we have not seen this node before
|
|
for(MSchedGraphSBNode::succ_iterator node_succ = node->succ_begin(), end=node->succ_end(); node_succ != end; ++node_succ) {
|
|
connectedComponentSet(*node_succ, ccSet, lastNodes);
|
|
}
|
|
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::searchPath(MSchedGraphSBNode *node,
|
|
std::vector<MSchedGraphSBNode*> &path,
|
|
std::set<MSchedGraphSBNode*> &nodesToAdd,
|
|
std::set<MSchedGraphSBNode*> &new_reccurrence) {
|
|
//Push node onto the path
|
|
path.push_back(node);
|
|
|
|
//Loop over all successors and see if there is a path from this node to
|
|
//a recurrence in the partial order, if so.. add all nodes to be added to recc
|
|
for(MSchedGraphSBNode::succ_iterator S = node->succ_begin(), SE = node->succ_end(); S != SE;
|
|
++S) {
|
|
|
|
//Check if we should ignore this edge first
|
|
if(ignoreEdge(node,*S))
|
|
continue;
|
|
|
|
//check if successor is in this recurrence, we will get to it eventually
|
|
if(new_reccurrence.count(*S))
|
|
continue;
|
|
|
|
//If this node exists in a recurrence already in the partial
|
|
//order, then add all nodes in the path to the set of nodes to add
|
|
//Check if its already in our partial order, if not add it to the
|
|
//final vector
|
|
bool found = false;
|
|
for(std::vector<std::set<MSchedGraphSBNode*> >::iterator PO = partialOrder.begin(),
|
|
PE = partialOrder.end(); PO != PE; ++PO) {
|
|
|
|
if(PO->count(*S)) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if(!found) {
|
|
nodesToAdd.insert(*S);
|
|
searchPath(*S, path, nodesToAdd, new_reccurrence);
|
|
}
|
|
}
|
|
|
|
//Pop Node off the path
|
|
path.pop_back();
|
|
}
|
|
|
|
void dumpIntersection(std::set<MSchedGraphSBNode*> &IntersectCurrent) {
|
|
std::cerr << "Intersection (";
|
|
for(std::set<MSchedGraphSBNode*>::iterator I = IntersectCurrent.begin(), E = IntersectCurrent.end(); I != E; ++I)
|
|
std::cerr << **I << ", ";
|
|
std::cerr << ")\n";
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::orderNodes() {
|
|
|
|
TIME_REGION(X, "orderNodes");
|
|
|
|
int BOTTOM_UP = 0;
|
|
int TOP_DOWN = 1;
|
|
|
|
//Set default order
|
|
int order = BOTTOM_UP;
|
|
|
|
//Loop over and find all pred nodes and schedule them first
|
|
/*for(std::vector<std::set<MSchedGraphSBNode*> >::iterator CurrentSet = partialOrder.begin(), E= partialOrder.end(); CurrentSet != E; ++CurrentSet) {
|
|
for(std::set<MSchedGraphSBNode*>::iterator N = CurrentSet->begin(), NE = CurrentSet->end(); N != NE; ++N)
|
|
if((*N)->isPredicate()) {
|
|
FinalNodeOrder.push_back(*N);
|
|
CurrentSet->erase(*N);
|
|
}
|
|
}*/
|
|
|
|
|
|
|
|
//Loop over all the sets and place them in the final node order
|
|
for(std::vector<std::set<MSchedGraphSBNode*> >::iterator CurrentSet = partialOrder.begin(), E= partialOrder.end(); CurrentSet != E; ++CurrentSet) {
|
|
|
|
DEBUG(std::cerr << "Processing set in S\n");
|
|
DEBUG(dumpIntersection(*CurrentSet));
|
|
|
|
//Result of intersection
|
|
std::set<MSchedGraphSBNode*> IntersectCurrent;
|
|
|
|
predIntersect(*CurrentSet, IntersectCurrent);
|
|
|
|
//If the intersection of predecessor and current set is not empty
|
|
//sort nodes bottom up
|
|
if(IntersectCurrent.size() != 0) {
|
|
DEBUG(std::cerr << "Final Node Order Predecessors and Current Set interesection is NOT empty\n");
|
|
order = BOTTOM_UP;
|
|
}
|
|
//If empty, use successors
|
|
else {
|
|
DEBUG(std::cerr << "Final Node Order Predecessors and Current Set interesection is empty\n");
|
|
|
|
succIntersect(*CurrentSet, IntersectCurrent);
|
|
|
|
//sort top-down
|
|
if(IntersectCurrent.size() != 0) {
|
|
DEBUG(std::cerr << "Final Node Order Successors and Current Set interesection is NOT empty\n");
|
|
order = TOP_DOWN;
|
|
}
|
|
else {
|
|
DEBUG(std::cerr << "Final Node Order Successors and Current Set interesection is empty\n");
|
|
//Find node with max ASAP in current Set
|
|
MSchedGraphSBNode *node;
|
|
int maxASAP = 0;
|
|
DEBUG(std::cerr << "Using current set of size " << CurrentSet->size() << "to find max ASAP\n");
|
|
for(std::set<MSchedGraphSBNode*>::iterator J = CurrentSet->begin(), JE = CurrentSet->end(); J != JE; ++J) {
|
|
//Get node attributes
|
|
MSNodeSBAttributes nodeAttr= nodeToAttributesMap.find(*J)->second;
|
|
//assert(nodeAttr != nodeToAttributesMap.end() && "Node not in attributes map!");
|
|
|
|
if(maxASAP <= nodeAttr.ASAP) {
|
|
maxASAP = nodeAttr.ASAP;
|
|
node = *J;
|
|
}
|
|
}
|
|
assert(node != 0 && "In node ordering node should not be null");
|
|
IntersectCurrent.insert(node);
|
|
order = BOTTOM_UP;
|
|
}
|
|
}
|
|
|
|
//Repeat until all nodes are put into the final order from current set
|
|
while(IntersectCurrent.size() > 0) {
|
|
|
|
if(order == TOP_DOWN) {
|
|
DEBUG(std::cerr << "Order is TOP DOWN\n");
|
|
|
|
while(IntersectCurrent.size() > 0) {
|
|
DEBUG(std::cerr << "Intersection is not empty, so find heighest height\n");
|
|
|
|
int MOB = 0;
|
|
int height = 0;
|
|
MSchedGraphSBNode *highestHeightNode = *(IntersectCurrent.begin());
|
|
|
|
//Find node in intersection with highest heigh and lowest MOB
|
|
for(std::set<MSchedGraphSBNode*>::iterator I = IntersectCurrent.begin(),
|
|
E = IntersectCurrent.end(); I != E; ++I) {
|
|
|
|
//Get current nodes properties
|
|
MSNodeSBAttributes nodeAttr= nodeToAttributesMap.find(*I)->second;
|
|
|
|
if(height < nodeAttr.height) {
|
|
highestHeightNode = *I;
|
|
height = nodeAttr.height;
|
|
MOB = nodeAttr.MOB;
|
|
}
|
|
else if(height == nodeAttr.height) {
|
|
if(MOB > nodeAttr.height) {
|
|
highestHeightNode = *I;
|
|
height = nodeAttr.height;
|
|
MOB = nodeAttr.MOB;
|
|
}
|
|
}
|
|
}
|
|
|
|
//Append our node with greatest height to the NodeOrder
|
|
if(std::find(FinalNodeOrder.begin(), FinalNodeOrder.end(), highestHeightNode) == FinalNodeOrder.end()) {
|
|
DEBUG(std::cerr << "Adding node to Final Order: " << *highestHeightNode << "\n");
|
|
FinalNodeOrder.push_back(highestHeightNode);
|
|
}
|
|
|
|
//Remove V from IntersectOrder
|
|
IntersectCurrent.erase(std::find(IntersectCurrent.begin(),
|
|
IntersectCurrent.end(), highestHeightNode));
|
|
|
|
|
|
//Intersect V's successors with CurrentSet
|
|
for(MSchedGraphSBNode::succ_iterator P = highestHeightNode->succ_begin(),
|
|
E = highestHeightNode->succ_end(); P != E; ++P) {
|
|
//if(lower_bound(CurrentSet->begin(),
|
|
// CurrentSet->end(), *P) != CurrentSet->end()) {
|
|
if(std::find(CurrentSet->begin(), CurrentSet->end(), *P) != CurrentSet->end()) {
|
|
if(ignoreEdge(highestHeightNode, *P))
|
|
continue;
|
|
//If not already in Intersect, add
|
|
if(!IntersectCurrent.count(*P))
|
|
IntersectCurrent.insert(*P);
|
|
}
|
|
}
|
|
} //End while loop over Intersect Size
|
|
|
|
//Change direction
|
|
order = BOTTOM_UP;
|
|
|
|
//Reset Intersect to reflect changes in OrderNodes
|
|
IntersectCurrent.clear();
|
|
predIntersect(*CurrentSet, IntersectCurrent);
|
|
|
|
} //End If TOP_DOWN
|
|
|
|
//Begin if BOTTOM_UP
|
|
else {
|
|
DEBUG(std::cerr << "Order is BOTTOM UP\n");
|
|
while(IntersectCurrent.size() > 0) {
|
|
DEBUG(std::cerr << "Intersection of size " << IntersectCurrent.size() << ", finding highest depth\n");
|
|
|
|
//dump intersection
|
|
DEBUG(dumpIntersection(IntersectCurrent));
|
|
//Get node with highest depth, if a tie, use one with lowest
|
|
//MOB
|
|
int MOB = 0;
|
|
int depth = 0;
|
|
MSchedGraphSBNode *highestDepthNode = *(IntersectCurrent.begin());
|
|
|
|
for(std::set<MSchedGraphSBNode*>::iterator I = IntersectCurrent.begin(),
|
|
E = IntersectCurrent.end(); I != E; ++I) {
|
|
//Find node attribute in graph
|
|
MSNodeSBAttributes nodeAttr= nodeToAttributesMap.find(*I)->second;
|
|
|
|
if(depth < nodeAttr.depth) {
|
|
highestDepthNode = *I;
|
|
depth = nodeAttr.depth;
|
|
MOB = nodeAttr.MOB;
|
|
}
|
|
else if(depth == nodeAttr.depth) {
|
|
if(MOB > nodeAttr.MOB) {
|
|
highestDepthNode = *I;
|
|
depth = nodeAttr.depth;
|
|
MOB = nodeAttr.MOB;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
//Append highest depth node to the NodeOrder
|
|
if(std::find(FinalNodeOrder.begin(), FinalNodeOrder.end(), highestDepthNode) == FinalNodeOrder.end()) {
|
|
DEBUG(std::cerr << "Adding node to Final Order: " << *highestDepthNode << "\n");
|
|
FinalNodeOrder.push_back(highestDepthNode);
|
|
}
|
|
//Remove heightestDepthNode from IntersectOrder
|
|
IntersectCurrent.erase(highestDepthNode);
|
|
|
|
|
|
//Intersect heightDepthNode's pred with CurrentSet
|
|
for(MSchedGraphSBNode::pred_iterator P = highestDepthNode->pred_begin(),
|
|
E = highestDepthNode->pred_end(); P != E; ++P) {
|
|
if(CurrentSet->count(*P)) {
|
|
if(ignoreEdge(*P, highestDepthNode))
|
|
continue;
|
|
|
|
//If not already in Intersect, add
|
|
if(!IntersectCurrent.count(*P))
|
|
IntersectCurrent.insert(*P);
|
|
}
|
|
}
|
|
|
|
} //End while loop over Intersect Size
|
|
|
|
//Change order
|
|
order = TOP_DOWN;
|
|
|
|
//Reset IntersectCurrent to reflect changes in OrderNodes
|
|
IntersectCurrent.clear();
|
|
succIntersect(*CurrentSet, IntersectCurrent);
|
|
} //End if BOTTOM_DOWN
|
|
|
|
DEBUG(std::cerr << "Current Intersection Size: " << IntersectCurrent.size() << "\n");
|
|
}
|
|
//End Wrapping while loop
|
|
DEBUG(std::cerr << "Ending Size of Current Set: " << CurrentSet->size() << "\n");
|
|
}//End for over all sets of nodes
|
|
|
|
//FIXME: As the algorithm stands it will NEVER add an instruction such as ba (with no
|
|
//data dependencies) to the final order. We add this manually. It will always be
|
|
//in the last set of S since its not part of a recurrence
|
|
//Loop over all the sets and place them in the final node order
|
|
std::vector<std::set<MSchedGraphSBNode*> > ::reverse_iterator LastSet = partialOrder.rbegin();
|
|
for(std::set<MSchedGraphSBNode*>::iterator CurrentNode = LastSet->begin(), LastNode = LastSet->end();
|
|
CurrentNode != LastNode; ++CurrentNode) {
|
|
if((*CurrentNode)->getInst()->getOpcode() == V9::BA)
|
|
FinalNodeOrder.push_back(*CurrentNode);
|
|
}
|
|
//Return final Order
|
|
//return FinalNodeOrder;
|
|
}
|
|
|
|
|
|
void ModuloSchedulingSBPass::predIntersect(std::set<MSchedGraphSBNode*> &CurrentSet, std::set<MSchedGraphSBNode*> &IntersectResult) {
|
|
|
|
for(unsigned j=0; j < FinalNodeOrder.size(); ++j) {
|
|
for(MSchedGraphSBNode::pred_iterator P = FinalNodeOrder[j]->pred_begin(),
|
|
E = FinalNodeOrder[j]->pred_end(); P != E; ++P) {
|
|
|
|
//Check if we are supposed to ignore this edge or not
|
|
if(ignoreEdge(*P,FinalNodeOrder[j]))
|
|
continue;
|
|
|
|
if(CurrentSet.count(*P))
|
|
if(std::find(FinalNodeOrder.begin(), FinalNodeOrder.end(), *P) == FinalNodeOrder.end())
|
|
IntersectResult.insert(*P);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::succIntersect(std::set<MSchedGraphSBNode*> &CurrentSet, std::set<MSchedGraphSBNode*> &IntersectResult) {
|
|
|
|
for(unsigned j=0; j < FinalNodeOrder.size(); ++j) {
|
|
for(MSchedGraphSBNode::succ_iterator P = FinalNodeOrder[j]->succ_begin(),
|
|
E = FinalNodeOrder[j]->succ_end(); P != E; ++P) {
|
|
|
|
//Check if we are supposed to ignore this edge or not
|
|
if(ignoreEdge(FinalNodeOrder[j],*P))
|
|
continue;
|
|
|
|
if(CurrentSet.count(*P))
|
|
if(std::find(FinalNodeOrder.begin(), FinalNodeOrder.end(), *P) == FinalNodeOrder.end())
|
|
IntersectResult.insert(*P);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
bool ModuloSchedulingSBPass::computeSchedule(std::vector<const MachineBasicBlock*> &SB, MSchedGraphSB *MSG) {
|
|
|
|
TIME_REGION(X, "computeSchedule");
|
|
|
|
bool success = false;
|
|
|
|
//FIXME: Should be set to max II of the original loop
|
|
//Cap II in order to prevent infinite loop
|
|
int capII = MSG->totalDelay();
|
|
|
|
while(!success) {
|
|
|
|
//Keep track of branches, but do not insert into the schedule
|
|
std::vector<MSchedGraphSBNode*> branches;
|
|
|
|
//Loop over the final node order and process each node
|
|
for(std::vector<MSchedGraphSBNode*>::iterator I = FinalNodeOrder.begin(),
|
|
E = FinalNodeOrder.end(); I != E; ++I) {
|
|
|
|
//CalculateEarly and Late start
|
|
bool initialLSVal = false;
|
|
bool initialESVal = false;
|
|
int EarlyStart = 0;
|
|
int LateStart = 0;
|
|
bool hasSucc = false;
|
|
bool hasPred = false;
|
|
bool sched;
|
|
|
|
if((*I)->isBranch())
|
|
if((*I)->hasPredecessors())
|
|
sched = true;
|
|
else
|
|
sched = false;
|
|
else
|
|
sched = true;
|
|
|
|
if(sched) {
|
|
//Loop over nodes in the schedule and determine if they are predecessors
|
|
//or successors of the node we are trying to schedule
|
|
for(MSScheduleSB::schedule_iterator nodesByCycle = schedule.begin(), nodesByCycleEnd = schedule.end();
|
|
nodesByCycle != nodesByCycleEnd; ++nodesByCycle) {
|
|
|
|
//For this cycle, get the vector of nodes schedule and loop over it
|
|
for(std::vector<MSchedGraphSBNode*>::iterator schedNode = nodesByCycle->second.begin(), SNE = nodesByCycle->second.end(); schedNode != SNE; ++schedNode) {
|
|
|
|
if((*I)->isPredecessor(*schedNode)) {
|
|
int diff = (*I)->getInEdge(*schedNode).getIteDiff();
|
|
int ES_Temp = nodesByCycle->first + (*schedNode)->getLatency() - diff * II;
|
|
DEBUG(std::cerr << "Diff: " << diff << " Cycle: " << nodesByCycle->first << "\n");
|
|
DEBUG(std::cerr << "Temp EarlyStart: " << ES_Temp << " Prev EarlyStart: " << EarlyStart << "\n");
|
|
if(initialESVal)
|
|
EarlyStart = std::max(EarlyStart, ES_Temp);
|
|
else {
|
|
EarlyStart = ES_Temp;
|
|
initialESVal = true;
|
|
}
|
|
hasPred = true;
|
|
}
|
|
if((*I)->isSuccessor(*schedNode)) {
|
|
int diff = (*schedNode)->getInEdge(*I).getIteDiff();
|
|
int LS_Temp = nodesByCycle->first - (*I)->getLatency() + diff * II;
|
|
DEBUG(std::cerr << "Diff: " << diff << " Cycle: " << nodesByCycle->first << "\n");
|
|
DEBUG(std::cerr << "Temp LateStart: " << LS_Temp << " Prev LateStart: " << LateStart << "\n");
|
|
if(initialLSVal)
|
|
LateStart = std::min(LateStart, LS_Temp);
|
|
else {
|
|
LateStart = LS_Temp;
|
|
initialLSVal = true;
|
|
}
|
|
hasSucc = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
branches.push_back(*I);
|
|
continue;
|
|
}
|
|
|
|
//Check if the node has no pred or successors and set Early Start to its ASAP
|
|
if(!hasSucc && !hasPred)
|
|
EarlyStart = nodeToAttributesMap.find(*I)->second.ASAP;
|
|
|
|
DEBUG(std::cerr << "Has Successors: " << hasSucc << ", Has Pred: " << hasPred << "\n");
|
|
DEBUG(std::cerr << "EarlyStart: " << EarlyStart << ", LateStart: " << LateStart << "\n");
|
|
|
|
//Now, try to schedule this node depending upon its pred and successor in the schedule
|
|
//already
|
|
if(!hasSucc && hasPred)
|
|
success = scheduleNode(*I, EarlyStart, (EarlyStart + II -1));
|
|
else if(!hasPred && hasSucc)
|
|
success = scheduleNode(*I, LateStart, (LateStart - II +1));
|
|
else if(hasPred && hasSucc) {
|
|
if(EarlyStart > LateStart) {
|
|
success = false;
|
|
//LateStart = EarlyStart;
|
|
DEBUG(std::cerr << "Early Start can not be later then the late start cycle, schedule fails\n");
|
|
}
|
|
else
|
|
success = scheduleNode(*I, EarlyStart, std::min(LateStart, (EarlyStart + II -1)));
|
|
}
|
|
else
|
|
success = scheduleNode(*I, EarlyStart, EarlyStart + II - 1);
|
|
|
|
if(!success) {
|
|
++II;
|
|
schedule.clear();
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
if(success) {
|
|
DEBUG(std::cerr << "Constructing Schedule Kernel\n");
|
|
success = schedule.constructKernel(II, branches, indVarInstrs[SB]);
|
|
DEBUG(std::cerr << "Done Constructing Schedule Kernel\n");
|
|
if(!success) {
|
|
++II;
|
|
schedule.clear();
|
|
}
|
|
DEBUG(std::cerr << "Final II: " << II << "\n");
|
|
|
|
}
|
|
|
|
if(II >= capII) {
|
|
DEBUG(std::cerr << "Maximum II reached, giving up\n");
|
|
return false;
|
|
}
|
|
|
|
assert(II < capII && "The II should not exceed the original loop number of cycles");
|
|
}
|
|
return true;
|
|
}
|
|
|
|
|
|
bool ModuloSchedulingSBPass::scheduleNode(MSchedGraphSBNode *node,
|
|
int start, int end) {
|
|
bool success = false;
|
|
|
|
DEBUG(std::cerr << *node << " (Start Cycle: " << start << ", End Cycle: " << end << ")\n");
|
|
|
|
//Make sure start and end are not negative
|
|
//if(start < 0) {
|
|
//start = 0;
|
|
|
|
//}
|
|
//if(end < 0)
|
|
//end = 0;
|
|
|
|
bool forward = true;
|
|
if(start > end)
|
|
forward = false;
|
|
|
|
bool increaseSC = true;
|
|
int cycle = start ;
|
|
|
|
|
|
while(increaseSC) {
|
|
|
|
increaseSC = false;
|
|
|
|
increaseSC = schedule.insert(node, cycle, II);
|
|
|
|
if(!increaseSC)
|
|
return true;
|
|
|
|
//Increment cycle to try again
|
|
if(forward) {
|
|
++cycle;
|
|
DEBUG(std::cerr << "Increase cycle: " << cycle << "\n");
|
|
if(cycle > end)
|
|
return false;
|
|
}
|
|
else {
|
|
--cycle;
|
|
DEBUG(std::cerr << "Decrease cycle: " << cycle << "\n");
|
|
if(cycle < end)
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return success;
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::reconstructLoop(std::vector<const MachineBasicBlock*> &SB) {
|
|
|
|
TIME_REGION(X, "reconstructLoop");
|
|
|
|
|
|
DEBUG(std::cerr << "Reconstructing Loop\n");
|
|
|
|
//First find the value *'s that we need to "save"
|
|
std::map<const Value*, std::pair<const MachineInstr*, int> > valuesToSave;
|
|
|
|
//Keep track of instructions we have already seen and their stage because
|
|
//we don't want to "save" values if they are used in the kernel immediately
|
|
std::map<const MachineInstr*, int> lastInstrs;
|
|
|
|
|
|
std::set<MachineBasicBlock*> seenBranchesBB;
|
|
const TargetInstrInfo *MTI = target.getInstrInfo();
|
|
std::map<MachineBasicBlock*, std::vector<std::pair<MachineInstr*, int> > > instrsMovedDown;
|
|
std::map<MachineBasicBlock*, int> branchStage;
|
|
|
|
//Loop over kernel and only look at instructions from a stage > 0
|
|
//Look at its operands and save values *'s that are read
|
|
for(MSScheduleSB::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
|
|
|
|
if(I->second !=0) {
|
|
//For this instruction, get the Value*'s that it reads and put them into the set.
|
|
//Assert if there is an operand of another type that we need to save
|
|
const MachineInstr *inst = I->first;
|
|
lastInstrs[inst] = I->second;
|
|
|
|
for(unsigned i=0; i < inst->getNumOperands(); ++i) {
|
|
//get machine operand
|
|
const MachineOperand &mOp = inst->getOperand(i);
|
|
|
|
if(mOp.getType() == MachineOperand::MO_VirtualRegister && mOp.isUse()) {
|
|
//find the value in the map
|
|
if (const Value* srcI = mOp.getVRegValue()) {
|
|
|
|
if(isa<Constant>(srcI) || isa<Argument>(srcI))
|
|
continue;
|
|
|
|
//Before we declare this Value* one that we should save
|
|
//make sure its def is not of the same stage as this instruction
|
|
//because it will be consumed before its used
|
|
Instruction *defInst = (Instruction*) srcI;
|
|
|
|
//Should we save this value?
|
|
bool save = true;
|
|
|
|
//Continue if not in the def map, loop invariant code does not need to be saved
|
|
if(!defMap.count(srcI))
|
|
continue;
|
|
|
|
MachineInstr *defInstr = defMap[srcI];
|
|
|
|
|
|
if(lastInstrs.count(defInstr)) {
|
|
if(lastInstrs[defInstr] == I->second) {
|
|
save = false;
|
|
|
|
}
|
|
}
|
|
|
|
if(save)
|
|
valuesToSave[srcI] = std::make_pair(I->first, i);
|
|
}
|
|
}
|
|
|
|
if(mOp.getType() != MachineOperand::MO_VirtualRegister && mOp.isUse()) {
|
|
assert("Our assumption is wrong. We have another type of register that needs to be saved\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//Do a check to see if instruction was moved below its original branch
|
|
if(MTI->isBranch(I->first->getOpcode())) {
|
|
seenBranchesBB.insert(I->first->getParent());
|
|
branchStage[I->first->getParent()] = I->second;
|
|
}
|
|
else {
|
|
instrsMovedDown[I->first->getParent()].push_back(std::make_pair(I->first, I->second));
|
|
//assert(seenBranchesBB.count(I->first->getParent()) && "Instruction moved below branch\n");
|
|
}
|
|
|
|
}
|
|
|
|
//The new loop will consist of one or more prologues, the kernel, and one or more epilogues.
|
|
|
|
//Map to keep track of old to new values
|
|
std::map<Value*, std::map<int, Value*> > newValues;
|
|
|
|
//Map to keep track of old to new values in kernel
|
|
std::map<Value*, std::map<int, Value*> > kernelPHIs;
|
|
|
|
//Another map to keep track of what machine basic blocks these new value*s are in since
|
|
//they have no llvm instruction equivalent
|
|
std::map<Value*, MachineBasicBlock*> newValLocation;
|
|
|
|
std::vector<std::vector<MachineBasicBlock*> > prologues;
|
|
std::vector<std::vector<BasicBlock*> > llvm_prologues;
|
|
|
|
//Map to keep track of where the inner branches go
|
|
std::map<const MachineBasicBlock*, Value*> sideExits;
|
|
|
|
|
|
//Write prologue
|
|
if(schedule.getMaxStage() != 0)
|
|
writePrologues(prologues, SB, llvm_prologues, valuesToSave, newValues, newValLocation);
|
|
|
|
std::vector<BasicBlock*> llvmKernelBBs;
|
|
std::vector<MachineBasicBlock*> machineKernelBBs;
|
|
Function *parent = (Function*) SB[0]->getBasicBlock()->getParent();
|
|
|
|
for(unsigned i = 0; i < SB.size(); ++i) {
|
|
llvmKernelBBs.push_back(new BasicBlock("Kernel", parent));
|
|
|
|
machineKernelBBs.push_back(new MachineBasicBlock(llvmKernelBBs[i]));
|
|
(((MachineBasicBlock*)SB[0])->getParent())->getBasicBlockList().push_back(machineKernelBBs[i]);
|
|
}
|
|
|
|
writeKernel(llvmKernelBBs, machineKernelBBs, valuesToSave, newValues, newValLocation, kernelPHIs);
|
|
|
|
|
|
std::vector<std::vector<MachineBasicBlock*> > epilogues;
|
|
std::vector<std::vector<BasicBlock*> > llvm_epilogues;
|
|
|
|
//Write epilogues
|
|
if(schedule.getMaxStage() != 0)
|
|
writeEpilogues(epilogues, SB, llvm_epilogues, valuesToSave, newValues, newValLocation, kernelPHIs);
|
|
|
|
|
|
//Fix our branches
|
|
fixBranches(prologues, llvm_prologues, machineKernelBBs, llvmKernelBBs, epilogues, llvm_epilogues, SB, sideExits);
|
|
|
|
//Print out epilogues and prologue
|
|
DEBUG(for(std::vector<std::vector<MachineBasicBlock*> >::iterator PI = prologues.begin(), PE = prologues.end();
|
|
PI != PE; ++PI) {
|
|
std::cerr << "PROLOGUE\n";
|
|
for(std::vector<MachineBasicBlock*>::iterator I = PI->begin(), E = PI->end(); I != E; ++I)
|
|
(*I)->print(std::cerr);
|
|
});
|
|
|
|
DEBUG(std::cerr << "KERNEL\n");
|
|
DEBUG(for(std::vector<MachineBasicBlock*>::iterator I = machineKernelBBs.begin(), E = machineKernelBBs.end(); I != E; ++I) { (*I)->print(std::cerr);});
|
|
|
|
DEBUG(for(std::vector<std::vector<MachineBasicBlock*> >::iterator EI = epilogues.begin(), EE = epilogues.end();
|
|
EI != EE; ++EI) {
|
|
std::cerr << "EPILOGUE\n";
|
|
for(std::vector<MachineBasicBlock*>::iterator I = EI->begin(), E = EI->end(); I != E; ++I)
|
|
(*I)->print(std::cerr);
|
|
});
|
|
|
|
|
|
//Remove phis
|
|
removePHIs(SB, prologues, epilogues, machineKernelBBs, newValLocation);
|
|
|
|
//Print out epilogues and prologue
|
|
DEBUG(for(std::vector<std::vector<MachineBasicBlock*> >::iterator PI = prologues.begin(), PE = prologues.end();
|
|
PI != PE; ++PI) {
|
|
std::cerr << "PROLOGUE\n";
|
|
for(std::vector<MachineBasicBlock*>::iterator I = PI->begin(), E = PI->end(); I != E; ++I)
|
|
(*I)->print(std::cerr);
|
|
});
|
|
|
|
DEBUG(std::cerr << "KERNEL\n");
|
|
DEBUG(for(std::vector<MachineBasicBlock*>::iterator I = machineKernelBBs.begin(), E = machineKernelBBs.end(); I != E; ++I) { (*I)->print(std::cerr);});
|
|
|
|
DEBUG(for(std::vector<std::vector<MachineBasicBlock*> >::iterator EI = epilogues.begin(), EE = epilogues.end();
|
|
EI != EE; ++EI) {
|
|
std::cerr << "EPILOGUE\n";
|
|
for(std::vector<MachineBasicBlock*>::iterator I = EI->begin(), E = EI->end(); I != E; ++I)
|
|
(*I)->print(std::cerr);
|
|
});
|
|
|
|
writeSideExits(prologues, llvm_prologues, epilogues, llvm_epilogues, sideExits, instrsMovedDown, SB, machineKernelBBs, branchStage);
|
|
|
|
|
|
DEBUG(std::cerr << "New Machine Function" << "\n");
|
|
}
|
|
|
|
|
|
void ModuloSchedulingSBPass::fixBranches(std::vector<std::vector<MachineBasicBlock*> > &prologues, std::vector<std::vector<BasicBlock*> > &llvm_prologues, std::vector<MachineBasicBlock*> &machineKernelBB, std::vector<BasicBlock*> &llvmKernelBB, std::vector<std::vector<MachineBasicBlock*> > &epilogues, std::vector<std::vector<BasicBlock*> > &llvm_epilogues, std::vector<const MachineBasicBlock*> &SB, std::map<const MachineBasicBlock*, Value*> &sideExits) {
|
|
|
|
const TargetInstrInfo *TMI = target.getInstrInfo();
|
|
|
|
//Get exit BB
|
|
BasicBlock *last = (BasicBlock*) SB[SB.size()-1]->getBasicBlock();
|
|
BasicBlock *kernel_exit = 0;
|
|
bool sawFirst = false;
|
|
|
|
for(succ_iterator I = succ_begin(last),
|
|
E = succ_end(last); I != E; ++I) {
|
|
if (*I != SB[0]->getBasicBlock()) {
|
|
kernel_exit = *I;
|
|
break;
|
|
}
|
|
else
|
|
sawFirst = true;
|
|
}
|
|
if(!kernel_exit && sawFirst) {
|
|
kernel_exit = (BasicBlock*) SB[0]->getBasicBlock();
|
|
}
|
|
|
|
assert(kernel_exit && "Kernel Exit can not be null");
|
|
|
|
if(schedule.getMaxStage() != 0) {
|
|
//Fix prologue branches
|
|
for(unsigned i = 0; i < prologues.size(); ++i) {
|
|
|
|
for(unsigned j = 0; j < prologues[i].size(); ++j) {
|
|
|
|
MachineBasicBlock *currentMBB = prologues[i][j];
|
|
|
|
//Find terminator since getFirstTerminator does not work!
|
|
for(MachineBasicBlock::reverse_iterator mInst = currentMBB->rbegin(), mInstEnd = currentMBB->rend(); mInst != mInstEnd; ++mInst) {
|
|
MachineOpCode OC = mInst->getOpcode();
|
|
//If its a branch update its branchto
|
|
if(TMI->isBranch(OC)) {
|
|
for(unsigned opNum = 0; opNum < mInst->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = mInst->getOperand(opNum);
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
//Check if we are branching to the kernel, if not branch to epilogue
|
|
if(mOp.getVRegValue() == SB[0]->getBasicBlock()) {
|
|
if(i >= prologues.size()-1)
|
|
mOp.setValueReg(llvmKernelBB[0]);
|
|
else
|
|
mOp.setValueReg(llvm_prologues[i+1][0]);
|
|
}
|
|
else if( (mOp.getVRegValue() == kernel_exit) && (j == prologues[i].size()-1)) {
|
|
mOp.setValueReg(llvm_epilogues[i][0]);
|
|
}
|
|
else if(mOp.getVRegValue() == SB[j+1]->getBasicBlock()) {
|
|
mOp.setValueReg(llvm_prologues[i][j+1]);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
DEBUG(std::cerr << "New Prologue Branch: " << *mInst << "\n");
|
|
}
|
|
}
|
|
|
|
//Update llvm basic block with our new branch instr
|
|
DEBUG(std::cerr << SB[i]->getBasicBlock()->getTerminator() << "\n");
|
|
|
|
const BranchInst *branchVal = dyn_cast<BranchInst>(SB[i]->getBasicBlock()->getTerminator());
|
|
|
|
//Check for inner branch
|
|
if(j < prologues[i].size()-1) {
|
|
//Find our side exit LLVM basic block
|
|
BasicBlock *sideExit = 0;
|
|
for(unsigned s = 0; s < branchVal->getNumSuccessors(); ++s) {
|
|
if(branchVal->getSuccessor(s) != SB[i+1]->getBasicBlock())
|
|
sideExit = branchVal->getSuccessor(s);
|
|
}
|
|
assert(sideExit && "Must have side exit llvm basic block");
|
|
TerminatorInst *newBranch = new BranchInst(sideExit,
|
|
llvm_prologues[i][j+1],
|
|
branchVal->getCondition(),
|
|
llvm_prologues[i][j]);
|
|
}
|
|
else {
|
|
//If last prologue
|
|
if(i == prologues.size()-1) {
|
|
TerminatorInst *newBranch = new BranchInst(llvmKernelBB[0],
|
|
llvm_epilogues[i][0],
|
|
branchVal->getCondition(),
|
|
llvm_prologues[i][j]);
|
|
}
|
|
else {
|
|
TerminatorInst *newBranch = new BranchInst(llvm_prologues[i+1][0],
|
|
llvm_epilogues[i][0],
|
|
branchVal->getCondition(),
|
|
llvm_prologues[i][j]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//Fix up kernel machine branches
|
|
for(unsigned i = 0; i < machineKernelBB.size(); ++i) {
|
|
MachineBasicBlock *currentMBB = machineKernelBB[i];
|
|
|
|
for(MachineBasicBlock::reverse_iterator mInst = currentMBB->rbegin(), mInstEnd = currentMBB->rend(); mInst != mInstEnd; ++mInst) {
|
|
MachineOpCode OC = mInst->getOpcode();
|
|
if(TMI->isBranch(OC)) {
|
|
for(unsigned opNum = 0; opNum < mInst->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = mInst->getOperand(opNum);
|
|
|
|
if(mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
//Deal with inner kernel branches
|
|
if(i < machineKernelBB.size()-1) {
|
|
if(mOp.getVRegValue() == SB[i+1]->getBasicBlock())
|
|
mOp.setValueReg(llvmKernelBB[i+1]);
|
|
//Side exit!
|
|
else {
|
|
sideExits[SB[i]] = mOp.getVRegValue();
|
|
}
|
|
}
|
|
else {
|
|
if(mOp.getVRegValue() == SB[0]->getBasicBlock())
|
|
mOp.setValueReg(llvmKernelBB[0]);
|
|
else {
|
|
if(llvm_epilogues.size() > 0)
|
|
mOp.setValueReg(llvm_epilogues[0][0]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//Update kernelLLVM branches
|
|
const BranchInst *branchVal = dyn_cast<BranchInst>(SB[0]->getBasicBlock()->getTerminator());
|
|
|
|
//deal with inner branch
|
|
if(i < machineKernelBB.size()-1) {
|
|
|
|
//Find our side exit LLVM basic block
|
|
BasicBlock *sideExit = 0;
|
|
for(unsigned s = 0; s < branchVal->getNumSuccessors(); ++s) {
|
|
if(branchVal->getSuccessor(s) != SB[i+1]->getBasicBlock())
|
|
sideExit = branchVal->getSuccessor(s);
|
|
}
|
|
assert(sideExit && "Must have side exit llvm basic block");
|
|
TerminatorInst *newBranch = new BranchInst(sideExit,
|
|
llvmKernelBB[i+1],
|
|
branchVal->getCondition(),
|
|
llvmKernelBB[i]);
|
|
}
|
|
else {
|
|
//Deal with outter branches
|
|
if(epilogues.size() > 0) {
|
|
TerminatorInst *newBranch = new BranchInst(llvmKernelBB[0],
|
|
llvm_epilogues[0][0],
|
|
branchVal->getCondition(),
|
|
llvmKernelBB[i]);
|
|
}
|
|
else {
|
|
TerminatorInst *newBranch = new BranchInst(llvmKernelBB[0],
|
|
kernel_exit,
|
|
branchVal->getCondition(),
|
|
llvmKernelBB[i]);
|
|
}
|
|
}
|
|
}
|
|
|
|
if(schedule.getMaxStage() != 0) {
|
|
|
|
//Lastly add unconditional branches for the epilogues
|
|
for(unsigned i = 0; i < epilogues.size(); ++i) {
|
|
|
|
for(unsigned j=0; j < epilogues[i].size(); ++j) {
|
|
//Now since we don't have fall throughs, add a unconditional
|
|
//branch to the next prologue
|
|
|
|
//Before adding these, we need to check if the epilogue already has
|
|
//a branch in it
|
|
bool hasBranch = false;
|
|
/*if(j < epilogues[i].size()-1) {
|
|
MachineBasicBlock *currentMBB = epilogues[i][j];
|
|
for(MachineBasicBlock::reverse_iterator mInst = currentMBB->rbegin(), mInstEnd = currentMBB->rend(); mInst != mInstEnd; ++mInst) {
|
|
|
|
MachineOpCode OC = mInst->getOpcode();
|
|
|
|
//If its a branch update its branchto
|
|
if(TMI->isBranch(OC)) {
|
|
hasBranch = true;
|
|
for(unsigned opNum = 0; opNum < mInst->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = mInst->getOperand(opNum);
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
|
|
if(mOp.getVRegValue() != sideExits[SB[j]]) {
|
|
mOp.setValueReg(llvm_epilogues[i][j+1]);
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
|
|
DEBUG(std::cerr << "New Epilogue Branch: " << *mInst << "\n");
|
|
}
|
|
}
|
|
if(hasBranch) {
|
|
const BranchInst *branchVal = dyn_cast<BranchInst>(SB[j]->getBasicBlock()->getTerminator());
|
|
TerminatorInst *newBranch = new BranchInst((BasicBlock*)sideExits[SB[j]],
|
|
llvm_epilogues[i][j+1],
|
|
branchVal->getCondition(),
|
|
llvm_epilogues[i][j]);
|
|
}
|
|
}*/
|
|
|
|
if(!hasBranch) {
|
|
|
|
//Handle inner branches
|
|
if(j < epilogues[i].size()-1) {
|
|
BuildMI(epilogues[i][j], V9::BA, 1).addPCDisp(llvm_epilogues[i][j+1]);
|
|
TerminatorInst *newBranch = new BranchInst(llvm_epilogues[i][j+1],
|
|
llvm_epilogues[i][j]);
|
|
}
|
|
else {
|
|
|
|
//Check if this is the last epilogue
|
|
if(i != epilogues.size()-1) {
|
|
BuildMI(epilogues[i][j], V9::BA, 1).addPCDisp(llvm_epilogues[i+1][0]);
|
|
//Add unconditional branch to end of epilogue
|
|
TerminatorInst *newBranch = new BranchInst(llvm_epilogues[i+1][0],
|
|
llvm_epilogues[i][j]);
|
|
|
|
}
|
|
else {
|
|
BuildMI(epilogues[i][j], V9::BA, 1).addPCDisp(kernel_exit);
|
|
TerminatorInst *newBranch = new BranchInst(kernel_exit, llvm_epilogues[i][j]);
|
|
}
|
|
}
|
|
|
|
//Add one more nop!
|
|
BuildMI(epilogues[i][j], V9::NOP, 0);
|
|
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//Find all llvm basic blocks that branch to the loop entry and
|
|
//change to our first prologue.
|
|
const BasicBlock *llvmBB = SB[0]->getBasicBlock();
|
|
|
|
std::vector<const BasicBlock*>Preds (pred_begin(llvmBB), pred_end(llvmBB));
|
|
|
|
for(std::vector<const BasicBlock*>::iterator P = Preds.begin(),
|
|
PE = Preds.end(); P != PE; ++P) {
|
|
if(*P == SB[SB.size()-1]->getBasicBlock())
|
|
continue;
|
|
else {
|
|
DEBUG(std::cerr << "Found our entry BB\n");
|
|
DEBUG((*P)->print(std::cerr));
|
|
//Get the Terminator instruction for this basic block and print it out
|
|
//DEBUG(std::cerr << *((*P)->getTerminator()) << "\n");
|
|
|
|
//Update the terminator
|
|
TerminatorInst *term = ((BasicBlock*)*P)->getTerminator();
|
|
for(unsigned i=0; i < term->getNumSuccessors(); ++i) {
|
|
if(term->getSuccessor(i) == llvmBB) {
|
|
DEBUG(std::cerr << "Replacing successor bb\n");
|
|
if(llvm_prologues.size() > 0) {
|
|
term->setSuccessor(i, llvm_prologues[0][0]);
|
|
|
|
DEBUG(std::cerr << "New Term" << *((*P)->getTerminator()) << "\n");
|
|
|
|
//Also update its corresponding machine instruction
|
|
MachineCodeForInstruction & tempMvec =
|
|
MachineCodeForInstruction::get(term);
|
|
for (unsigned j = 0; j < tempMvec.size(); j++) {
|
|
MachineInstr *temp = tempMvec[j];
|
|
MachineOpCode opc = temp->getOpcode();
|
|
if(TMI->isBranch(opc)) {
|
|
DEBUG(std::cerr << *temp << "\n");
|
|
//Update branch
|
|
for(unsigned opNum = 0; opNum < temp->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = temp->getOperand(opNum);
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
if(mOp.getVRegValue() == llvmBB)
|
|
mOp.setValueReg(llvm_prologues[0][0]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
term->setSuccessor(i, llvmKernelBB[0]);
|
|
|
|
//Also update its corresponding machine instruction
|
|
MachineCodeForInstruction & tempMvec =
|
|
MachineCodeForInstruction::get(term);
|
|
for(unsigned j = 0; j < tempMvec.size(); j++) {
|
|
MachineInstr *temp = tempMvec[j];
|
|
MachineOpCode opc = temp->getOpcode();
|
|
if(TMI->isBranch(opc)) {
|
|
DEBUG(std::cerr << *temp << "\n");
|
|
//Update branch
|
|
for(unsigned opNum = 0; opNum < temp->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = temp->getOperand(opNum);
|
|
if(mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
if(mOp.getVRegValue() == llvmBB)
|
|
mOp.setValueReg(llvmKernelBB[0]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
|
|
void ModuloSchedulingSBPass::writePrologues(std::vector<std::vector<MachineBasicBlock *> > &prologues, std::vector<const MachineBasicBlock*> &origSB, std::vector<std::vector<BasicBlock*> > &llvm_prologues, std::map<const Value*, std::pair<const MachineInstr*, int> > &valuesToSave, std::map<Value*, std::map<int, Value*> > &newValues, std::map<Value*, MachineBasicBlock*> &newValLocation) {
|
|
|
|
//Keep a map to easily know whats in the kernel
|
|
std::map<int, std::set<const MachineInstr*> > inKernel;
|
|
int maxStageCount = 0;
|
|
|
|
//Keep a map of new values we consumed in case they need to be added back
|
|
std::map<Value*, std::map<int, Value*> > consumedValues;
|
|
|
|
DEBUG(schedule.print(std::cerr));
|
|
|
|
for(MSScheduleSB::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
|
|
maxStageCount = std::max(maxStageCount, I->second);
|
|
|
|
//Put int the map so we know what instructions in each stage are in the kernel
|
|
DEBUG(std::cerr << "Inserting instruction " << *(I->first) << " into map at stage " << I->second << "\n");
|
|
inKernel[I->second].insert(I->first);
|
|
}
|
|
|
|
//Get target information to look at machine operands
|
|
const TargetInstrInfo *mii = target.getInstrInfo();
|
|
|
|
//Now write the prologues
|
|
for(int i = 0; i < maxStageCount; ++i) {
|
|
std::vector<MachineBasicBlock*> current_prologue;
|
|
std::vector<BasicBlock*> current_llvm_prologue;
|
|
|
|
for(std::vector<const MachineBasicBlock*>::iterator MB = origSB.begin(),
|
|
MBE = origSB.end(); MB != MBE; ++MB) {
|
|
const MachineBasicBlock *MBB = *MB;
|
|
//Create new llvm and machine bb
|
|
BasicBlock *llvmBB = new BasicBlock("PROLOGUE", (Function*) (MBB->getBasicBlock()->getParent()));
|
|
MachineBasicBlock *machineBB = new MachineBasicBlock(llvmBB);
|
|
|
|
DEBUG(std::cerr << "i=" << i << "\n");
|
|
|
|
for(int j = i; j >= 0; --j) {
|
|
//iterate over instructions in original bb
|
|
for(MachineBasicBlock::const_iterator MI = MBB->begin(),
|
|
ME = MBB->end(); ME != MI; ++MI) {
|
|
if(inKernel[j].count(&*MI)) {
|
|
MachineInstr *instClone = MI->clone();
|
|
machineBB->push_back(instClone);
|
|
|
|
//If its a branch, insert a nop
|
|
if(mii->isBranch(instClone->getOpcode()))
|
|
BuildMI(machineBB, V9::NOP, 0);
|
|
|
|
|
|
DEBUG(std::cerr << "Cloning: " << *MI << "\n");
|
|
|
|
//After cloning, we may need to save the value that this instruction defines
|
|
for(unsigned opNum=0; opNum < MI->getNumOperands(); ++opNum) {
|
|
Instruction *tmp;
|
|
|
|
//get machine operand
|
|
MachineOperand &mOp = instClone->getOperand(opNum);
|
|
if(mOp.getType() == MachineOperand::MO_VirtualRegister
|
|
&& mOp.isDef()) {
|
|
|
|
//Check if this is a value we should save
|
|
if(valuesToSave.count(mOp.getVRegValue())) {
|
|
//Save copy in tmpInstruction
|
|
tmp = new TmpInstruction(mOp.getVRegValue());
|
|
|
|
//Add TmpInstruction to safe LLVM Instruction MCFI
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(defaultInst);
|
|
tempMvec.addTemp((Value*) tmp);
|
|
|
|
DEBUG(std::cerr << "Value: " << *(mOp.getVRegValue())
|
|
<< " New Value: " << *tmp << " Stage: " << i << "\n");
|
|
|
|
newValues[mOp.getVRegValue()][i]= tmp;
|
|
newValLocation[tmp] = machineBB;
|
|
|
|
DEBUG(std::cerr << "Machine Instr Operands: "
|
|
<< *(mOp.getVRegValue()) << ", 0, " << *tmp << "\n");
|
|
|
|
//Create machine instruction and put int machineBB
|
|
MachineInstr *saveValue;
|
|
if(mOp.getVRegValue()->getType() == Type::FloatTy)
|
|
saveValue = BuildMI(machineBB, V9::FMOVS, 3).addReg(mOp.getVRegValue()).addRegDef(tmp);
|
|
else if(mOp.getVRegValue()->getType() == Type::DoubleTy)
|
|
saveValue = BuildMI(machineBB, V9::FMOVD, 3).addReg(mOp.getVRegValue()).addRegDef(tmp);
|
|
else
|
|
saveValue = BuildMI(machineBB, V9::ORr, 3).addReg(mOp.getVRegValue()).addImm(0).addRegDef(tmp);
|
|
|
|
|
|
DEBUG(std::cerr << "Created new machine instr: " << *saveValue << "\n");
|
|
}
|
|
}
|
|
|
|
//We may also need to update the value that we use if
|
|
//its from an earlier prologue
|
|
if(j != 0) {
|
|
if(mOp.getType() == MachineOperand::MO_VirtualRegister && mOp.isUse()) {
|
|
if(newValues.count(mOp.getVRegValue())) {
|
|
if(newValues[mOp.getVRegValue()].count(i-1)) {
|
|
Value *oldV = mOp.getVRegValue();
|
|
DEBUG(std::cerr << "Replaced this value: " << mOp.getVRegValue() << " With:" << (newValues[mOp.getVRegValue()][i-1]) << "\n");
|
|
//Update the operand with the right value
|
|
mOp.setValueReg(newValues[mOp.getVRegValue()][i-1]);
|
|
|
|
//Remove this value since we have consumed it
|
|
//NOTE: Should this only be done if j != maxStage?
|
|
consumedValues[oldV][i-1] = (newValues[oldV][i-1]);
|
|
DEBUG(std::cerr << "Deleted value: " << consumedValues[oldV][i-1] << "\n");
|
|
newValues[oldV].erase(i-1);
|
|
}
|
|
}
|
|
else
|
|
if(consumedValues.count(mOp.getVRegValue()))
|
|
assert(!consumedValues[mOp.getVRegValue()].count(i-1) && "Found a case where we need the value");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
(((MachineBasicBlock*)MBB)->getParent())->getBasicBlockList().push_back(machineBB);
|
|
current_prologue.push_back(machineBB);
|
|
current_llvm_prologue.push_back(llvmBB);
|
|
}
|
|
prologues.push_back(current_prologue);
|
|
llvm_prologues.push_back(current_llvm_prologue);
|
|
|
|
}
|
|
}
|
|
|
|
|
|
void ModuloSchedulingSBPass::writeEpilogues(std::vector<std::vector<MachineBasicBlock*> > &epilogues, std::vector<const MachineBasicBlock*> &origSB, std::vector<std::vector<BasicBlock*> > &llvm_epilogues, std::map<const Value*, std::pair<const MachineInstr*, int> > &valuesToSave, std::map<Value*, std::map<int, Value*> > &newValues,std::map<Value*, MachineBasicBlock*> &newValLocation, std::map<Value*, std::map<int, Value*> > &kernelPHIs ) {
|
|
|
|
std::map<int, std::set<const MachineInstr*> > inKernel;
|
|
const TargetInstrInfo *MTI = target.getInstrInfo();
|
|
|
|
for(MSScheduleSB::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
|
|
|
|
//Put int the map so we know what instructions in each stage are in the kernel
|
|
inKernel[I->second].insert(I->first);
|
|
}
|
|
|
|
std::map<Value*, Value*> valPHIs;
|
|
|
|
//some debug stuff, will remove later
|
|
DEBUG(for(std::map<Value*, std::map<int, Value*> >::iterator V = newValues.begin(), E = newValues.end(); V !=E; ++V) {
|
|
std::cerr << "Old Value: " << *(V->first) << "\n";
|
|
for(std::map<int, Value*>::iterator I = V->second.begin(), IE = V->second.end(); I != IE; ++I)
|
|
std::cerr << "Stage: " << I->first << " Value: " << *(I->second) << "\n";
|
|
});
|
|
|
|
|
|
//Now write the epilogues
|
|
for(int i = schedule.getMaxStage()-1; i >= 0; --i) {
|
|
std::vector<MachineBasicBlock*> current_epilogue;
|
|
std::vector<BasicBlock*> current_llvm_epilogue;
|
|
|
|
for(std::vector<const MachineBasicBlock*>::iterator MB = origSB.begin(), MBE = origSB.end(); MB != MBE; ++MB) {
|
|
const MachineBasicBlock *MBB = *MB;
|
|
|
|
BasicBlock *llvmBB = new BasicBlock("EPILOGUE", (Function*) (MBB->getBasicBlock()->getParent()));
|
|
MachineBasicBlock *machineBB = new MachineBasicBlock(llvmBB);
|
|
|
|
DEBUG(std::cerr << " Epilogue #: " << i << "\n");
|
|
|
|
std::map<Value*, int> inEpilogue;
|
|
|
|
for(MachineBasicBlock::const_iterator MI = MBB->begin(), ME = MBB->end(); ME != MI; ++MI) {
|
|
for(int j=schedule.getMaxStage(); j > i; --j) {
|
|
if(inKernel[j].count(&*MI)) {
|
|
DEBUG(std::cerr << "Cloning instruction " << *MI << "\n");
|
|
MachineInstr *clone = MI->clone();
|
|
|
|
//Update operands that need to use the result from the phi
|
|
for(unsigned opNum=0; opNum < clone->getNumOperands(); ++opNum) {
|
|
//get machine operand
|
|
const MachineOperand &mOp = clone->getOperand(opNum);
|
|
|
|
if((mOp.getType() == MachineOperand::MO_VirtualRegister && mOp.isUse())) {
|
|
|
|
DEBUG(std::cerr << "Writing PHI for " << (mOp.getVRegValue()) << "\n");
|
|
|
|
//If this is the last instructions for the max iterations ago, don't update operands
|
|
if(inEpilogue.count(mOp.getVRegValue()))
|
|
if(inEpilogue[mOp.getVRegValue()] == i)
|
|
continue;
|
|
|
|
//Quickly write appropriate phis for this operand
|
|
if(newValues.count(mOp.getVRegValue())) {
|
|
if(newValues[mOp.getVRegValue()].count(i)) {
|
|
Instruction *tmp = new TmpInstruction(newValues[mOp.getVRegValue()][i]);
|
|
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(defaultInst);
|
|
tempMvec.addTemp((Value*) tmp);
|
|
|
|
//assert of no kernelPHI for this value
|
|
assert(kernelPHIs[mOp.getVRegValue()][i] !=0 && "Must have final kernel phi to construct epilogue phi");
|
|
|
|
MachineInstr *saveValue = BuildMI(machineBB, V9::PHI, 3).addReg(newValues[mOp.getVRegValue()][i]).addReg(kernelPHIs[mOp.getVRegValue()][i]).addRegDef(tmp);
|
|
DEBUG(std::cerr << "Resulting PHI: " << *saveValue << "\n");
|
|
valPHIs[mOp.getVRegValue()] = tmp;
|
|
}
|
|
}
|
|
|
|
if(valPHIs.count(mOp.getVRegValue())) {
|
|
//Update the operand in the cloned instruction
|
|
clone->getOperand(opNum).setValueReg(valPHIs[mOp.getVRegValue()]);
|
|
}
|
|
}
|
|
else if((mOp.getType() == MachineOperand::MO_VirtualRegister && mOp.isDef())) {
|
|
inEpilogue[mOp.getVRegValue()] = i;
|
|
}
|
|
|
|
}
|
|
machineBB->push_back(clone);
|
|
//if(MTI->isBranch(clone->getOpcode()))
|
|
//BuildMI(machineBB, V9::NOP, 0);
|
|
}
|
|
}
|
|
}
|
|
(((MachineBasicBlock*)MBB)->getParent())->getBasicBlockList().push_back(machineBB);
|
|
current_epilogue.push_back(machineBB);
|
|
current_llvm_epilogue.push_back(llvmBB);
|
|
}
|
|
|
|
DEBUG(std::cerr << "EPILOGUE #" << i << "\n");
|
|
DEBUG(for(std::vector<MachineBasicBlock*>::iterator B = current_epilogue.begin(), BE = current_epilogue.end(); B != BE; ++B) {
|
|
(*B)->print(std::cerr);});
|
|
|
|
epilogues.push_back(current_epilogue);
|
|
llvm_epilogues.push_back(current_llvm_epilogue);
|
|
}
|
|
}
|
|
|
|
void ModuloSchedulingSBPass::writeKernel(std::vector<BasicBlock*> &llvmBB, std::vector<MachineBasicBlock*> &machineBB, std::map<const Value*, std::pair<const MachineInstr*, int> > &valuesToSave, std::map<Value*, std::map<int, Value*> > &newValues, std::map<Value*, MachineBasicBlock*> &newValLocation, std::map<Value*, std::map<int, Value*> > &kernelPHIs) {
|
|
|
|
//Keep track of operands that are read and saved from a previous iteration. The new clone
|
|
//instruction will use the result of the phi instead.
|
|
std::map<Value*, Value*> finalPHIValue;
|
|
std::map<Value*, Value*> kernelValue;
|
|
|
|
//Branches are a special case
|
|
std::vector<MachineInstr*> branches;
|
|
|
|
//Get target information to look at machine operands
|
|
const TargetInstrInfo *mii = target.getInstrInfo();
|
|
unsigned index = 0;
|
|
int numBr = 0;
|
|
bool seenBranch = false;
|
|
|
|
//Create TmpInstructions for the final phis
|
|
for(MSScheduleSB::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
|
|
|
|
DEBUG(std::cerr << "Stage: " << I->second << " Inst: " << *(I->first) << "\n";);
|
|
|
|
//Clone instruction
|
|
const MachineInstr *inst = I->first;
|
|
MachineInstr *instClone = inst->clone();
|
|
|
|
if(seenBranch && !mii->isBranch(instClone->getOpcode())) {
|
|
index++;
|
|
seenBranch = false;
|
|
numBr = 0;
|
|
}
|
|
else if(seenBranch && (numBr == 2)) {
|
|
index++;
|
|
numBr = 0;
|
|
}
|
|
|
|
//Insert into machine basic block
|
|
assert(index < machineBB.size() && "Must have a valid index into kernel MBBs");
|
|
machineBB[index]->push_back(instClone);
|
|
|
|
if(mii->isBranch(instClone->getOpcode())) {
|
|
BuildMI(machineBB[index], V9::NOP, 0);
|
|
|
|
seenBranch = true;
|
|
numBr++;
|
|
}
|
|
|
|
DEBUG(std::cerr << "Cloned Inst: " << *instClone << "\n");
|
|
|
|
//Loop over Machine Operands
|
|
for(unsigned i=0; i < inst->getNumOperands(); ++i) {
|
|
//get machine operand
|
|
const MachineOperand &mOp = inst->getOperand(i);
|
|
|
|
if(I->second != 0) {
|
|
if(mOp.getType() == MachineOperand::MO_VirtualRegister && mOp.isUse()) {
|
|
|
|
//Check to see where this operand is defined if this instruction is from max stage
|
|
if(I->second == schedule.getMaxStage()) {
|
|
DEBUG(std::cerr << "VREG: " << *(mOp.getVRegValue()) << "\n");
|
|
}
|
|
|
|
//If its in the value saved, we need to create a temp instruction and use that instead
|
|
if(valuesToSave.count(mOp.getVRegValue())) {
|
|
|
|
//Check if we already have a final PHI value for this
|
|
if(!finalPHIValue.count(mOp.getVRegValue())) {
|
|
//Only create phi if the operand def is from a stage before this one
|
|
if(schedule.defPreviousStage(mOp.getVRegValue(), I->second)) {
|
|
TmpInstruction *tmp = new TmpInstruction(mOp.getVRegValue());
|
|
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(defaultInst);
|
|
tempMvec.addTemp((Value*) tmp);
|
|
|
|
//Update the operand in the cloned instruction
|
|
instClone->getOperand(i).setValueReg(tmp);
|
|
|
|
//save this as our final phi
|
|
finalPHIValue[mOp.getVRegValue()] = tmp;
|
|
newValLocation[tmp] = machineBB[index];
|
|
}
|
|
}
|
|
else {
|
|
//Use the previous final phi value
|
|
instClone->getOperand(i).setValueReg(finalPHIValue[mOp.getVRegValue()]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
if(I->second != schedule.getMaxStage()) {
|
|
if(mOp.getType() == MachineOperand::MO_VirtualRegister && mOp.isDef()) {
|
|
if(valuesToSave.count(mOp.getVRegValue())) {
|
|
|
|
TmpInstruction *tmp = new TmpInstruction(mOp.getVRegValue());
|
|
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempVec = MachineCodeForInstruction::get(defaultInst);
|
|
tempVec.addTemp((Value*) tmp);
|
|
|
|
//Create new machine instr and put in MBB
|
|
MachineInstr *saveValue;
|
|
if(mOp.getVRegValue()->getType() == Type::FloatTy)
|
|
saveValue = BuildMI(machineBB[index], V9::FMOVS, 3).addReg(mOp.getVRegValue()).addRegDef(tmp);
|
|
else if(mOp.getVRegValue()->getType() == Type::DoubleTy)
|
|
saveValue = BuildMI(machineBB[index], V9::FMOVD, 3).addReg(mOp.getVRegValue()).addRegDef(tmp);
|
|
else
|
|
saveValue = BuildMI(machineBB[index], V9::ORr, 3).addReg(mOp.getVRegValue()).addImm(0).addRegDef(tmp);
|
|
|
|
|
|
//Save for future cleanup
|
|
kernelValue[mOp.getVRegValue()] = tmp;
|
|
newValLocation[tmp] = machineBB[index];
|
|
kernelPHIs[mOp.getVRegValue()][schedule.getMaxStage()-1] = tmp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
//Loop over each value we need to generate phis for
|
|
for(std::map<Value*, std::map<int, Value*> >::iterator V = newValues.begin(),
|
|
E = newValues.end(); V != E; ++V) {
|
|
|
|
|
|
DEBUG(std::cerr << "Writing phi for" << *(V->first));
|
|
DEBUG(std::cerr << "\nMap of Value* for this phi\n");
|
|
DEBUG(for(std::map<int, Value*>::iterator I = V->second.begin(),
|
|
IE = V->second.end(); I != IE; ++I) {
|
|
std::cerr << "Stage: " << I->first;
|
|
std::cerr << " Value: " << *(I->second) << "\n";
|
|
});
|
|
|
|
//If we only have one current iteration live, its safe to set
|
|
//lastPhi = to kernel value
|
|
if(V->second.size() == 1) {
|
|
assert(kernelValue[V->first] != 0 && "Kernel value* must exist to create phi");
|
|
MachineInstr *saveValue = BuildMI(*machineBB[0], machineBB[0]->begin(),V9::PHI, 3).addReg(V->second.begin()->second).addReg(kernelValue[V->first]).addRegDef(finalPHIValue[V->first]);
|
|
DEBUG(std::cerr << "Resulting PHI (one live): " << *saveValue << "\n");
|
|
kernelPHIs[V->first][V->second.begin()->first] = kernelValue[V->first];
|
|
DEBUG(std::cerr << "Put kernel phi in at stage: " << schedule.getMaxStage()-1 << " (map stage = " << V->second.begin()->first << ")\n");
|
|
}
|
|
else {
|
|
|
|
//Keep track of last phi created.
|
|
Instruction *lastPhi = 0;
|
|
|
|
unsigned count = 1;
|
|
//Loop over the the map backwards to generate phis
|
|
for(std::map<int, Value*>::reverse_iterator I = V->second.rbegin(), IE = V->second.rend();
|
|
I != IE; ++I) {
|
|
|
|
if(count < (V->second).size()) {
|
|
if(lastPhi == 0) {
|
|
lastPhi = new TmpInstruction(I->second);
|
|
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(defaultInst);
|
|
tempMvec.addTemp((Value*) lastPhi);
|
|
|
|
MachineInstr *saveValue = BuildMI(*machineBB[0], machineBB[0]->begin(), V9::PHI, 3).addReg(kernelValue[V->first]).addReg(I->second).addRegDef(lastPhi);
|
|
DEBUG(std::cerr << "Resulting PHI: " << *saveValue << "\n");
|
|
newValLocation[lastPhi] = machineBB[0];
|
|
}
|
|
else {
|
|
Instruction *tmp = new TmpInstruction(I->second);
|
|
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(defaultInst);
|
|
tempMvec.addTemp((Value*) tmp);
|
|
|
|
|
|
MachineInstr *saveValue = BuildMI(*machineBB[0], machineBB[0]->begin(), V9::PHI, 3).addReg(lastPhi).addReg(I->second).addRegDef(tmp);
|
|
DEBUG(std::cerr << "Resulting PHI: " << *saveValue << "\n");
|
|
lastPhi = tmp;
|
|
kernelPHIs[V->first][I->first] = lastPhi;
|
|
newValLocation[lastPhi] = machineBB[0];
|
|
}
|
|
}
|
|
//Final phi value
|
|
else {
|
|
//The resulting value must be the Value* we created earlier
|
|
assert(lastPhi != 0 && "Last phi is NULL!\n");
|
|
MachineInstr *saveValue = BuildMI(*machineBB[0], machineBB[0]->begin(), V9::PHI, 3).addReg(lastPhi).addReg(I->second).addRegDef(finalPHIValue[V->first]);
|
|
DEBUG(std::cerr << "Resulting PHI: " << *saveValue << "\n");
|
|
kernelPHIs[V->first][I->first] = finalPHIValue[V->first];
|
|
}
|
|
|
|
++count;
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
void ModuloSchedulingSBPass::removePHIs(std::vector<const MachineBasicBlock*> &SB, std::vector<std::vector<MachineBasicBlock*> > &prologues, std::vector<std::vector<MachineBasicBlock*> > &epilogues, std::vector<MachineBasicBlock*> &kernelBB, std::map<Value*, MachineBasicBlock*> &newValLocation) {
|
|
|
|
//Worklist to delete things
|
|
std::vector<std::pair<MachineBasicBlock*, MachineBasicBlock::iterator> > worklist;
|
|
|
|
//Worklist of TmpInstructions that need to be added to a MCFI
|
|
std::vector<Instruction*> addToMCFI;
|
|
|
|
//Worklist to add OR instructions to end of kernel so not to invalidate the iterator
|
|
//std::vector<std::pair<Instruction*, Value*> > newORs;
|
|
|
|
const TargetInstrInfo *TMI = target.getInstrInfo();
|
|
|
|
//Start with the kernel and for each phi insert a copy for the phi
|
|
//def and for each arg
|
|
//phis are only in the first BB in the kernel
|
|
for(MachineBasicBlock::iterator I = kernelBB[0]->begin(), E = kernelBB[0]->end();
|
|
I != E; ++I) {
|
|
|
|
DEBUG(std::cerr << "Looking at Instr: " << *I << "\n");
|
|
|
|
//Get op code and check if its a phi
|
|
if(I->getOpcode() == V9::PHI) {
|
|
|
|
DEBUG(std::cerr << "Replacing PHI: " << *I << "\n");
|
|
Instruction *tmp = 0;
|
|
|
|
for(unsigned i = 0; i < I->getNumOperands(); ++i) {
|
|
|
|
//Get Operand
|
|
const MachineOperand &mOp = I->getOperand(i);
|
|
assert(mOp.getType() == MachineOperand::MO_VirtualRegister
|
|
&& "Should be a Value*\n");
|
|
|
|
if(!tmp) {
|
|
tmp = new TmpInstruction(mOp.getVRegValue());
|
|
addToMCFI.push_back(tmp);
|
|
}
|
|
|
|
//Now for all our arguments we read, OR to the new
|
|
//TmpInstruction that we created
|
|
if(mOp.isUse()) {
|
|
DEBUG(std::cerr << "Use: " << mOp << "\n");
|
|
//Place a copy at the end of its BB but before the branches
|
|
assert(newValLocation.count(mOp.getVRegValue()) && "We must know where this value is located\n");
|
|
//Reverse iterate to find the branches, we can safely assume no instructions have been
|
|
//put in the nop positions
|
|
for(MachineBasicBlock::iterator inst = --(newValLocation[mOp.getVRegValue()])->end(), endBB = (newValLocation[mOp.getVRegValue()])->begin(); inst != endBB; --inst) {
|
|
MachineOpCode opc = inst->getOpcode();
|
|
if(TMI->isBranch(opc) || TMI->isNop(opc))
|
|
continue;
|
|
else {
|
|
if(mOp.getVRegValue()->getType() == Type::FloatTy)
|
|
BuildMI(*(newValLocation[mOp.getVRegValue()]), ++inst, V9::FMOVS, 3).addReg(mOp.getVRegValue()).addRegDef(tmp);
|
|
else if(mOp.getVRegValue()->getType() == Type::DoubleTy)
|
|
BuildMI(*(newValLocation[mOp.getVRegValue()]), ++inst, V9::FMOVD, 3).addReg(mOp.getVRegValue()).addRegDef(tmp);
|
|
else
|
|
BuildMI(*(newValLocation[mOp.getVRegValue()]), ++inst, V9::ORr, 3).addReg(mOp.getVRegValue()).addImm(0).addRegDef(tmp);
|
|
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
else {
|
|
//Remove the phi and replace it with an OR
|
|
DEBUG(std::cerr << "Def: " << mOp << "\n");
|
|
//newORs.push_back(std::make_pair(tmp, mOp.getVRegValue()));
|
|
if(tmp->getType() == Type::FloatTy)
|
|
BuildMI(*kernelBB[0], I, V9::FMOVS, 3).addReg(tmp).addRegDef(mOp.getVRegValue());
|
|
else if(tmp->getType() == Type::DoubleTy)
|
|
BuildMI(*kernelBB[0], I, V9::FMOVD, 3).addReg(tmp).addRegDef(mOp.getVRegValue());
|
|
else
|
|
BuildMI(*kernelBB[0], I, V9::ORr, 3).addReg(tmp).addImm(0).addRegDef(mOp.getVRegValue());
|
|
|
|
|
|
worklist.push_back(std::make_pair(kernelBB[0], I));
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
}
|
|
|
|
//Add TmpInstructions to some MCFI
|
|
if(addToMCFI.size() > 0) {
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(defaultInst);
|
|
for(unsigned x = 0; x < addToMCFI.size(); ++x) {
|
|
tempMvec.addTemp(addToMCFI[x]);
|
|
}
|
|
addToMCFI.clear();
|
|
}
|
|
|
|
|
|
//Remove phis from epilogue
|
|
for(std::vector<std::vector<MachineBasicBlock*> >::iterator MB = epilogues.begin(),
|
|
ME = epilogues.end(); MB != ME; ++MB) {
|
|
|
|
for(std::vector<MachineBasicBlock*>::iterator currentMBB = MB->begin(), currentME = MB->end(); currentMBB != currentME; ++currentMBB) {
|
|
|
|
for(MachineBasicBlock::iterator I = (*currentMBB)->begin(),
|
|
E = (*currentMBB)->end(); I != E; ++I) {
|
|
|
|
DEBUG(std::cerr << "Looking at Instr: " << *I << "\n");
|
|
//Get op code and check if its a phi
|
|
if(I->getOpcode() == V9::PHI) {
|
|
Instruction *tmp = 0;
|
|
|
|
for(unsigned i = 0; i < I->getNumOperands(); ++i) {
|
|
//Get Operand
|
|
const MachineOperand &mOp = I->getOperand(i);
|
|
assert(mOp.getType() == MachineOperand::MO_VirtualRegister && "Should be a Value*\n");
|
|
|
|
if(!tmp) {
|
|
tmp = new TmpInstruction(mOp.getVRegValue());
|
|
addToMCFI.push_back(tmp);
|
|
}
|
|
|
|
//Now for all our arguments we read, OR to the new TmpInstruction that we created
|
|
if(mOp.isUse()) {
|
|
DEBUG(std::cerr << "Use: " << mOp << "\n");
|
|
//Place a copy at the end of its BB but before the branches
|
|
assert(newValLocation.count(mOp.getVRegValue()) && "We must know where this value is located\n");
|
|
//Reverse iterate to find the branches, we can safely assume no instructions have been
|
|
//put in the nop positions
|
|
for(MachineBasicBlock::iterator inst = --(newValLocation[mOp.getVRegValue()])->end(), endBB = (newValLocation[mOp.getVRegValue()])->begin(); inst != endBB; --inst) {
|
|
MachineOpCode opc = inst->getOpcode();
|
|
if(TMI->isBranch(opc) || TMI->isNop(opc))
|
|
continue;
|
|
else {
|
|
if(mOp.getVRegValue()->getType() == Type::FloatTy)
|
|
BuildMI(*(newValLocation[mOp.getVRegValue()]), ++inst, V9::FMOVS, 3).addReg(mOp.getVRegValue()).addRegDef(tmp);
|
|
else if(mOp.getVRegValue()->getType() == Type::DoubleTy)
|
|
BuildMI(*(newValLocation[mOp.getVRegValue()]), ++inst, V9::FMOVD, 3).addReg(mOp.getVRegValue()).addRegDef(tmp);
|
|
else
|
|
BuildMI(*(newValLocation[mOp.getVRegValue()]), ++inst, V9::ORr, 3).addReg(mOp.getVRegValue()).addImm(0).addRegDef(tmp);
|
|
|
|
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
else {
|
|
//Remove the phi and replace it with an OR
|
|
DEBUG(std::cerr << "Def: " << mOp << "\n");
|
|
if(tmp->getType() == Type::FloatTy)
|
|
BuildMI(**currentMBB, I, V9::FMOVS, 3).addReg(tmp).addRegDef(mOp.getVRegValue());
|
|
else if(tmp->getType() == Type::DoubleTy)
|
|
BuildMI(**currentMBB, I, V9::FMOVD, 3).addReg(tmp).addRegDef(mOp.getVRegValue());
|
|
else
|
|
BuildMI(**currentMBB, I, V9::ORr, 3).addReg(tmp).addImm(0).addRegDef(mOp.getVRegValue());
|
|
|
|
worklist.push_back(std::make_pair(*currentMBB,I));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
if(addToMCFI.size() > 0) {
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(defaultInst);
|
|
for(unsigned x = 0; x < addToMCFI.size(); ++x) {
|
|
tempMvec.addTemp(addToMCFI[x]);
|
|
}
|
|
addToMCFI.clear();
|
|
}
|
|
|
|
//Delete the phis
|
|
for(std::vector<std::pair<MachineBasicBlock*, MachineBasicBlock::iterator> >::iterator I = worklist.begin(), E = worklist.end(); I != E; ++I) {
|
|
DEBUG(std::cerr << "Deleting PHI " << *I->second << "\n");
|
|
I->first->erase(I->second);
|
|
|
|
}
|
|
|
|
|
|
assert((addToMCFI.size() == 0) && "We should have added all TmpInstructions to some MachineCodeForInstruction");
|
|
}
|
|
|
|
|
|
|
|
|
|
void ModuloSchedulingSBPass::writeSideExits(std::vector<std::vector<MachineBasicBlock *> > &prologues, std::vector<std::vector<BasicBlock*> > &llvm_prologues, std::vector<std::vector<MachineBasicBlock *> > &epilogues, std::vector<std::vector<BasicBlock*> > &llvm_epilogues, std::map<const MachineBasicBlock*, Value*> &sideExits, std::map<MachineBasicBlock*, std::vector<std::pair<MachineInstr*, int> > > &instrsMovedDown, std::vector<const MachineBasicBlock*> &SB, std::vector<MachineBasicBlock*> &kernelMBBs, std::map<MachineBasicBlock*, int> branchStage) {
|
|
|
|
const TargetInstrInfo *TMI = target.getInstrInfo();
|
|
|
|
//Repeat for each side exit
|
|
for(unsigned sideExitNum = 0; sideExitNum < SB.size()-1; ++sideExitNum) {
|
|
|
|
std::vector<std::vector<BasicBlock*> > side_llvm_epilogues;
|
|
std::vector<std::vector<MachineBasicBlock*> > side_epilogues;
|
|
MachineBasicBlock* sideMBB;
|
|
BasicBlock* sideBB;
|
|
|
|
//Create side exit blocks
|
|
//Get the LLVM basic block
|
|
BasicBlock *bb = (BasicBlock*) SB[sideExitNum]->getBasicBlock();
|
|
MachineBasicBlock *mbb = (MachineBasicBlock*) SB[sideExitNum];
|
|
|
|
int stage = branchStage[mbb];
|
|
|
|
//Create new basic blocks for our side exit instructios that were moved below the branch
|
|
sideBB = new BasicBlock("SideExit", (Function*) bb->getParent());
|
|
sideMBB = new MachineBasicBlock(sideBB);
|
|
(((MachineBasicBlock*)SB[0])->getParent())->getBasicBlockList().push_back(sideMBB);
|
|
|
|
|
|
if(instrsMovedDown.count(mbb)) {
|
|
for(std::vector<std::pair<MachineInstr*, int> >::iterator I = instrsMovedDown[mbb].begin(), E = instrsMovedDown[mbb].end(); I != E; ++I) {
|
|
if(branchStage[mbb] == I->second)
|
|
sideMBB->push_back((I->first)->clone());
|
|
}
|
|
|
|
//Add unconditional branches to original exits
|
|
BuildMI(sideMBB, V9::BA, 1).addPCDisp(sideExits[mbb]);
|
|
BuildMI(sideMBB, V9::NOP, 0);
|
|
|
|
//Add unconditioal branch to llvm BB
|
|
BasicBlock *extBB = dyn_cast<BasicBlock>(sideExits[mbb]);
|
|
assert(extBB && "Side exit basicblock can not be null");
|
|
TerminatorInst *newBranch = new BranchInst(extBB, sideBB);
|
|
}
|
|
|
|
//Clone epilogues and update their branches, one cloned epilogue set per side exit
|
|
//only clone epilogues that are from a greater stage!
|
|
for(unsigned i = 0; i < epilogues.size()-stage; ++i) {
|
|
std::vector<MachineBasicBlock*> MB = epilogues[i];
|
|
|
|
std::vector<MachineBasicBlock*> newEp;
|
|
std::vector<BasicBlock*> newLLVMEp;
|
|
|
|
for(std::vector<MachineBasicBlock*>::iterator currentMBB = MB.begin(),
|
|
lastMBB = MB.end(); currentMBB != lastMBB; ++currentMBB) {
|
|
BasicBlock *tmpBB = new BasicBlock("SideEpilogue", (Function*) (*currentMBB)->getBasicBlock()->getParent());
|
|
MachineBasicBlock *tmp = new MachineBasicBlock(tmpBB);
|
|
|
|
//Clone instructions and insert into new MBB
|
|
for(MachineBasicBlock::iterator I = (*currentMBB)->begin(),
|
|
E = (*currentMBB)->end(); I != E; ++I) {
|
|
|
|
MachineInstr *clone = I->clone();
|
|
if(clone->getOpcode() == V9::BA && (currentMBB+1 == lastMBB)) {
|
|
//update branch to side exit
|
|
for(unsigned i = 0; i < clone->getNumOperands(); ++i) {
|
|
MachineOperand &mOp = clone->getOperand(i);
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
mOp.setValueReg(sideBB);
|
|
}
|
|
}
|
|
}
|
|
|
|
tmp->push_back(clone);
|
|
|
|
}
|
|
|
|
//Add llvm branch
|
|
TerminatorInst *newBranch = new BranchInst(sideBB, tmpBB);
|
|
|
|
newEp.push_back(tmp);
|
|
(((MachineBasicBlock*)SB[0])->getParent())->getBasicBlockList().push_back(tmp);
|
|
|
|
newLLVMEp.push_back(tmpBB);
|
|
|
|
}
|
|
side_llvm_epilogues.push_back(newLLVMEp);
|
|
side_epilogues.push_back(newEp);
|
|
}
|
|
|
|
//Now stich up all the branches
|
|
|
|
//Loop over prologues, and if its an inner branch and branches to our original side exit
|
|
//then have it branch to the appropriate epilogue first (if it exists)
|
|
for(unsigned P = 0; P < prologues.size(); ++P) {
|
|
|
|
//Get BB side exit we are dealing with
|
|
MachineBasicBlock *currentMBB = prologues[P][sideExitNum];
|
|
if(P >= (unsigned) stage) {
|
|
//Iterate backwards of machine instructions to find the branch we need to update
|
|
for(MachineBasicBlock::reverse_iterator mInst = currentMBB->rbegin(), mInstEnd = currentMBB->rend(); mInst != mInstEnd; ++mInst) {
|
|
MachineOpCode OC = mInst->getOpcode();
|
|
|
|
//If its a branch update its branchto
|
|
if(TMI->isBranch(OC)) {
|
|
for(unsigned opNum = 0; opNum < mInst->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = mInst->getOperand(opNum);
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
//Check if we branch to side exit
|
|
if(mOp.getVRegValue() == sideExits[mbb]) {
|
|
mOp.setValueReg(side_llvm_epilogues[P][0]);
|
|
}
|
|
}
|
|
}
|
|
DEBUG(std::cerr << "New Prologue Branch: " << *mInst << "\n");
|
|
}
|
|
}
|
|
|
|
//Update llvm branch
|
|
TerminatorInst *branchVal = ((BasicBlock*) currentMBB->getBasicBlock())->getTerminator();
|
|
DEBUG(std::cerr << *branchVal << "\n");
|
|
|
|
for(unsigned i=0; i < branchVal->getNumSuccessors(); ++i) {
|
|
if(branchVal->getSuccessor(i) == sideExits[mbb]) {
|
|
DEBUG(std::cerr << "Replacing successor bb\n");
|
|
branchVal->setSuccessor(i, side_llvm_epilogues[P][0]);
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
//must add BA branch because another prologue or kernel has the actual side exit branch
|
|
//Add unconditional branches to original exits
|
|
assert( (sideExitNum+1) < prologues[P].size() && "must have valid prologue to branch to");
|
|
BuildMI(prologues[P][sideExitNum], V9::BA, 1).addPCDisp((BasicBlock*)(prologues[P][sideExitNum+1])->getBasicBlock());
|
|
BuildMI(prologues[P][sideExitNum], V9::NOP, 0);
|
|
|
|
TerminatorInst *newBranch = new BranchInst((BasicBlock*) (prologues[P][sideExitNum+1])->getBasicBlock(), (BasicBlock*) (prologues[P][sideExitNum])->getBasicBlock());
|
|
|
|
}
|
|
}
|
|
|
|
|
|
//Update side exits in kernel
|
|
MachineBasicBlock *currentMBB = kernelMBBs[sideExitNum];
|
|
//Iterate backwards of machine instructions to find the branch we need to update
|
|
for(MachineBasicBlock::reverse_iterator mInst = currentMBB->rbegin(), mInstEnd = currentMBB->rend(); mInst != mInstEnd; ++mInst) {
|
|
MachineOpCode OC = mInst->getOpcode();
|
|
|
|
//If its a branch update its branchto
|
|
if(TMI->isBranch(OC)) {
|
|
for(unsigned opNum = 0; opNum < mInst->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = mInst->getOperand(opNum);
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
//Check if we branch to side exit
|
|
if(mOp.getVRegValue() == sideExits[mbb]) {
|
|
if(side_llvm_epilogues.size() > 0)
|
|
mOp.setValueReg(side_llvm_epilogues[0][0]);
|
|
else
|
|
mOp.setValueReg(sideBB);
|
|
}
|
|
}
|
|
}
|
|
DEBUG(std::cerr << "New Prologue Branch: " << *mInst << "\n");
|
|
}
|
|
}
|
|
|
|
//Update llvm branch
|
|
//Update llvm branch
|
|
TerminatorInst *branchVal = ((BasicBlock*)currentMBB->getBasicBlock())->getTerminator();
|
|
DEBUG(std::cerr << *branchVal << "\n");
|
|
|
|
for(unsigned i=0; i < branchVal->getNumSuccessors(); ++i) {
|
|
if(branchVal->getSuccessor(i) == sideExits[mbb]) {
|
|
DEBUG(std::cerr << "Replacing successor bb\n");
|
|
if(side_llvm_epilogues.size() > 0)
|
|
branchVal->setSuccessor(i, side_llvm_epilogues[0][0]);
|
|
else
|
|
branchVal->setSuccessor(i, sideBB);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|