mirror of
https://github.com/c64scene-ar/llvm-6502.git
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a645750722
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16979 91177308-0d34-0410-b5e6-96231b3b80d8
2069 lines
70 KiB
C++
2069 lines
70 KiB
C++
//===-- ModuloScheduling.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.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "ModuloSched"
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#include "ModuloScheduling.h"
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#include "llvm/Instructions.h"
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#include "llvm/Function.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/Target/TargetSchedInfo.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/ADT/StringExtras.h"
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#include <cmath>
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#include <algorithm>
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#include <fstream>
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#include <sstream>
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#include <utility>
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#include <vector>
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#include "../MachineCodeForInstruction.h"
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#include "../SparcV9TmpInstr.h"
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#include "../SparcV9Internals.h"
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#include "../SparcV9RegisterInfo.h"
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using namespace llvm;
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/// Create ModuloSchedulingPass
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///
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FunctionPass *llvm::createModuloSchedulingPass(TargetMachine & targ) {
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DEBUG(std::cerr << "Created ModuloSchedulingPass\n");
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return new ModuloSchedulingPass(targ);
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}
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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 WriteGraphToFile(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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//Graph Traits for printing out the dependence graph
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namespace llvm {
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template<>
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struct DOTGraphTraits<MSchedGraph*> : public DefaultDOTGraphTraits {
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static std::string getGraphName(MSchedGraph *F) {
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return "Dependence Graph";
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}
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static std::string getNodeLabel(MSchedGraphNode *Node, MSchedGraph *Graph) {
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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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static std::string getEdgeSourceLabel(MSchedGraphNode *Node,
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MSchedGraphNode::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 MSchedGraphEdge::TrueDep:
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edgelabel = "True";
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break;
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case MSchedGraphEdge::AntiDep:
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edgelabel = "Anti";
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break;
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case MSchedGraphEdge::OutputDep:
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edgelabel = "Output";
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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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}
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/// ModuloScheduling::runOnFunction - main transformation entry point
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/// The Swing Modulo Schedule algorithm has three basic steps:
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/// 1) Computation and Analysis of the dependence graph
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/// 2) Ordering of the nodes
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/// 3) Scheduling
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///
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bool ModuloSchedulingPass::runOnFunction(Function &F) {
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bool Changed = false;
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DEBUG(std::cerr << "Creating ModuloSchedGraph for each valid BasicBlock in " + F.getName() + "\n");
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//Get MachineFunction
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MachineFunction &MF = MachineFunction::get(&F);
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//Worklist
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std::vector<MachineBasicBlock*> Worklist;
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//Iterate over BasicBlocks and put them into our worklist if they are valid
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for (MachineFunction::iterator BI = MF.begin(); BI != MF.end(); ++BI)
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if(MachineBBisValid(BI))
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Worklist.push_back(&*BI);
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DEBUG(if(Worklist.size() == 0) std::cerr << "No single basic block loops in function to ModuloSchedule\n");
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//Iterate over the worklist and perform scheduling
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for(std::vector<MachineBasicBlock*>::iterator BI = Worklist.begin(),
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BE = Worklist.end(); BI != BE; ++BI) {
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MSchedGraph *MSG = new MSchedGraph(*BI, target);
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//Write Graph out to file
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DEBUG(WriteGraphToFile(std::cerr, F.getName(), MSG));
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//Print out BB for debugging
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DEBUG(std::cerr << "ModuloScheduling BB: \n"; (*BI)->print(std::cerr));
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//Calculate Resource II
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int ResMII = calculateResMII(*BI);
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//Calculate Recurrence II
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int RecMII = calculateRecMII(MSG, ResMII);
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//Our starting initiation interval is the maximum of RecMII and ResMII
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II = std::max(RecMII, ResMII);
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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<MSchedGraphNode*, MSNodeAttributes>::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::vector<MSchedGraphNode*> >::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::vector<MSchedGraphNode*>::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<MSchedGraphNode*>::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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computeSchedule();
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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
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reconstructLoop(*BI);
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//Print out new loop
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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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//Clean up. Nuke old MachineBB and llvmBB
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//BasicBlock *llvmBB = (BasicBlock*) (*BI)->getBasicBlock();
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//Function *parent = (Function*) llvmBB->getParent();
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//Should't std::find work??
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//parent->getBasicBlockList().erase(std::find(parent->getBasicBlockList().begin(), parent->getBasicBlockList().end(), *llvmBB));
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//parent->getBasicBlockList().erase(llvmBB);
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//delete(llvmBB);
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//delete(*BI);
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}
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return Changed;
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}
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/// This function checks if a Machine Basic Block is valid for modulo
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/// scheduling. This means that it has no control flow (if/else or
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/// calls) in the block. Currently ModuloScheduling only works on
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/// single basic block loops.
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bool ModuloSchedulingPass::MachineBBisValid(const MachineBasicBlock *BI) {
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bool isLoop = false;
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//Check first if its a valid loop
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for(succ_const_iterator I = succ_begin(BI->getBasicBlock()),
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E = succ_end(BI->getBasicBlock()); I != E; ++I) {
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if (*I == BI->getBasicBlock()) // has single block loop
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isLoop = true;
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}
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if(!isLoop)
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return false;
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//Get Target machine instruction info
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const TargetInstrInfo *TMI = target.getInstrInfo();
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//Check each instruction and look for calls
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for(MachineBasicBlock::const_iterator I = BI->begin(), E = BI->end(); I != E; ++I) {
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//Get opcode to check instruction type
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MachineOpCode OC = I->getOpcode();
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if(TMI->isCall(OC))
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return false;
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}
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return true;
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}
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//ResMII is calculated by determining the usage count for each resource
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//and using the maximum.
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//FIXME: In future there should be a way to get alternative resources
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//for each instruction
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int ModuloSchedulingPass::calculateResMII(const MachineBasicBlock *BI) {
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const TargetInstrInfo *mii = target.getInstrInfo();
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const TargetSchedInfo *msi = target.getSchedInfo();
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int ResMII = 0;
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//Map to keep track of usage count of each resource
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std::map<unsigned, unsigned> resourceUsageCount;
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for(MachineBasicBlock::const_iterator I = BI->begin(), E = BI->end(); I != E; ++I) {
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//Get resource usage for this instruction
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InstrRUsage rUsage = msi->getInstrRUsage(I->getOpcode());
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std::vector<std::vector<resourceId_t> > resources = rUsage.resourcesByCycle;
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//Loop over resources in each cycle and increments their usage count
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for(unsigned i=0; i < resources.size(); ++i)
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for(unsigned j=0; j < resources[i].size(); ++j) {
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if( resourceUsageCount.find(resources[i][j]) == resourceUsageCount.end()) {
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resourceUsageCount[resources[i][j]] = 1;
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}
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else {
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resourceUsageCount[resources[i][j]] = resourceUsageCount[resources[i][j]] + 1;
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}
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}
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}
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//Find maximum usage count
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//Get max number of instructions that can be issued at once. (FIXME)
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int issueSlots = msi->maxNumIssueTotal;
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for(std::map<unsigned,unsigned>::iterator RB = resourceUsageCount.begin(), RE = resourceUsageCount.end(); RB != RE; ++RB) {
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//Get the total number of the resources in our cpu
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int resourceNum = CPUResource::getCPUResource(RB->first)->maxNumUsers;
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//Get total usage count for this resources
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unsigned usageCount = RB->second;
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//Divide the usage count by either the max number we can issue or the number of
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//resources (whichever is its upper bound)
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double finalUsageCount;
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if( resourceNum <= issueSlots)
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finalUsageCount = ceil(1.0 * usageCount / resourceNum);
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else
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finalUsageCount = ceil(1.0 * usageCount / issueSlots);
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//Only keep track of the max
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ResMII = std::max( (int) finalUsageCount, ResMII);
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}
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return ResMII;
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}
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/// calculateRecMII - Calculates the value of the highest recurrence
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/// By value we mean the total latency
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int ModuloSchedulingPass::calculateRecMII(MSchedGraph *graph, int MII) {
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std::vector<MSchedGraphNode*> vNodes;
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//Loop over all nodes in the graph
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for(MSchedGraph::iterator I = graph->begin(), E = graph->end(); I != E; ++I) {
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findAllReccurrences(I->second, vNodes, MII);
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vNodes.clear();
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}
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int RecMII = 0;
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for(std::set<std::pair<int, std::vector<MSchedGraphNode*> > >::iterator I = recurrenceList.begin(), E=recurrenceList.end(); I !=E; ++I) {
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DEBUG(for(std::vector<MSchedGraphNode*>::const_iterator N = I->second.begin(), NE = I->second.end(); N != NE; ++N) {
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std::cerr << **N << "\n";
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});
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RecMII = std::max(RecMII, I->first);
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}
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return MII;
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}
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/// calculateNodeAttributes - The following properties are calculated for
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/// each node in the dependence graph: ASAP, ALAP, Depth, Height, and
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/// MOB.
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void ModuloSchedulingPass::calculateNodeAttributes(MSchedGraph *graph, int MII) {
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//Loop over the nodes and add them to the map
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for(MSchedGraph::iterator I = graph->begin(), E = graph->end(); I != E; ++I) {
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//Assert if its already in the map
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assert(nodeToAttributesMap.find(I->second) == nodeToAttributesMap.end() && "Node attributes are already in the map");
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//Put into the map with default attribute values
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nodeToAttributesMap[I->second] = MSNodeAttributes();
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}
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//Create set to deal with reccurrences
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std::set<MSchedGraphNode*> visitedNodes;
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//Now Loop over map and calculate the node attributes
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for(std::map<MSchedGraphNode*, MSNodeAttributes>::iterator I = nodeToAttributesMap.begin(), E = nodeToAttributesMap.end(); I != E; ++I) {
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calculateASAP(I->first, MII, (MSchedGraphNode*) 0);
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visitedNodes.clear();
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}
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int maxASAP = findMaxASAP();
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//Calculate ALAP which depends on ASAP being totally calculated
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for(std::map<MSchedGraphNode*, MSNodeAttributes>::iterator I = nodeToAttributesMap.begin(), E = nodeToAttributesMap.end(); I != E; ++I) {
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calculateALAP(I->first, MII, maxASAP, (MSchedGraphNode*) 0);
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visitedNodes.clear();
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}
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//Calculate MOB which depends on ASAP being totally calculated, also do depth and height
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for(std::map<MSchedGraphNode*, MSNodeAttributes>::iterator I = nodeToAttributesMap.begin(), E = nodeToAttributesMap.end(); I != E; ++I) {
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(I->second).MOB = std::max(0,(I->second).ALAP - (I->second).ASAP);
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DEBUG(std::cerr << "MOB: " << (I->second).MOB << " (" << *(I->first) << ")\n");
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calculateDepth(I->first, (MSchedGraphNode*) 0);
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calculateHeight(I->first, (MSchedGraphNode*) 0);
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}
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}
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/// ignoreEdge - Checks to see if this edge of a recurrence should be ignored or not
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bool ModuloSchedulingPass::ignoreEdge(MSchedGraphNode *srcNode, MSchedGraphNode *destNode) {
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if(destNode == 0 || srcNode ==0)
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return false;
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bool findEdge = edgesToIgnore.count(std::make_pair(srcNode, destNode->getInEdgeNum(srcNode)));
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return findEdge;
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}
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/// calculateASAP - Calculates the
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int ModuloSchedulingPass::calculateASAP(MSchedGraphNode *node, int MII, MSchedGraphNode *destNode) {
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DEBUG(std::cerr << "Calculating ASAP for " << *node << "\n");
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//Get current node attributes
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MSNodeAttributes &attributes = nodeToAttributesMap.find(node)->second;
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if(attributes.ASAP != -1)
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return attributes.ASAP;
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int maxPredValue = 0;
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//Iterate over all of the predecessors and find max
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for(MSchedGraphNode::pred_iterator P = node->pred_begin(), E = node->pred_end(); P != E; ++P) {
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//Only process if we are not ignoring the edge
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if(!ignoreEdge(*P, node)) {
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int predASAP = -1;
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predASAP = calculateASAP(*P, MII, node);
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assert(predASAP != -1 && "ASAP has not been calculated");
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int iteDiff = node->getInEdge(*P).getIteDiff();
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int currentPredValue = predASAP + (*P)->getLatency() - (iteDiff * MII);
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DEBUG(std::cerr << "pred ASAP: " << predASAP << ", iteDiff: " << iteDiff << ", PredLatency: " << (*P)->getLatency() << ", Current ASAP pred: " << currentPredValue << "\n");
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maxPredValue = std::max(maxPredValue, currentPredValue);
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}
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}
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attributes.ASAP = maxPredValue;
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DEBUG(std::cerr << "ASAP: " << attributes.ASAP << " (" << *node << ")\n");
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return maxPredValue;
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}
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int ModuloSchedulingPass::calculateALAP(MSchedGraphNode *node, int MII,
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int maxASAP, MSchedGraphNode *srcNode) {
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DEBUG(std::cerr << "Calculating ALAP for " << *node << "\n");
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MSNodeAttributes &attributes = nodeToAttributesMap.find(node)->second;
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if(attributes.ALAP != -1)
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return attributes.ALAP;
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if(node->hasSuccessors()) {
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//Trying to deal with the issue where the node has successors, but
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//we are ignoring all of the edges to them. So this is my hack for
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//now.. there is probably a more elegant way of doing this (FIXME)
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bool processedOneEdge = false;
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//FIXME, set to something high to start
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int minSuccValue = 9999999;
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//Iterate over all of the predecessors and fine max
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for(MSchedGraphNode::succ_iterator P = node->succ_begin(),
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E = node->succ_end(); P != E; ++P) {
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//Only process if we are not ignoring the edge
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if(!ignoreEdge(node, *P)) {
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processedOneEdge = true;
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int succALAP = -1;
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succALAP = calculateALAP(*P, MII, maxASAP, node);
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assert(succALAP != -1 && "Successors ALAP should have been caclulated");
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int iteDiff = P.getEdge().getIteDiff();
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int currentSuccValue = succALAP - node->getLatency() + iteDiff * MII;
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DEBUG(std::cerr << "succ ALAP: " << succALAP << ", iteDiff: " << iteDiff << ", SuccLatency: " << (*P)->getLatency() << ", Current ALAP succ: " << currentSuccValue << "\n");
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minSuccValue = std::min(minSuccValue, currentSuccValue);
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}
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}
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if(processedOneEdge)
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attributes.ALAP = minSuccValue;
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else
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attributes.ALAP = maxASAP;
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}
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else
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attributes.ALAP = maxASAP;
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DEBUG(std::cerr << "ALAP: " << attributes.ALAP << " (" << *node << ")\n");
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if(attributes.ALAP < 0)
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attributes.ALAP = 0;
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return attributes.ALAP;
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}
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int ModuloSchedulingPass::findMaxASAP() {
|
|
int maxASAP = 0;
|
|
|
|
for(std::map<MSchedGraphNode*, MSNodeAttributes>::iterator I = nodeToAttributesMap.begin(),
|
|
E = nodeToAttributesMap.end(); I != E; ++I)
|
|
maxASAP = std::max(maxASAP, I->second.ASAP);
|
|
return maxASAP;
|
|
}
|
|
|
|
|
|
int ModuloSchedulingPass::calculateHeight(MSchedGraphNode *node,MSchedGraphNode *srcNode) {
|
|
|
|
MSNodeAttributes &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(MSchedGraphNode::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 ModuloSchedulingPass::calculateDepth(MSchedGraphNode *node,
|
|
MSchedGraphNode *destNode) {
|
|
|
|
MSNodeAttributes &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(MSchedGraphNode::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 ModuloSchedulingPass::addReccurrence(std::vector<MSchedGraphNode*> &recurrence, int II, MSchedGraphNode *srcBENode, MSchedGraphNode *destBENode) {
|
|
//Check to make sure that this recurrence is unique
|
|
bool same = false;
|
|
|
|
|
|
//Loop over all recurrences already in our list
|
|
for(std::set<std::pair<int, std::vector<MSchedGraphNode*> > >::iterator R = recurrenceList.begin(), RE = recurrenceList.end(); R != RE; ++R) {
|
|
|
|
bool all_same = true;
|
|
//First compare size
|
|
if(R->second.size() == recurrence.size()) {
|
|
|
|
for(std::vector<MSchedGraphNode*>::const_iterator node = R->second.begin(), end = R->second.end(); node != end; ++node) {
|
|
if(std::find(recurrence.begin(), recurrence.end(), *node) == recurrence.end()) {
|
|
all_same = all_same && false;
|
|
break;
|
|
}
|
|
else
|
|
all_same = all_same && true;
|
|
}
|
|
if(all_same) {
|
|
same = true;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if(!same) {
|
|
srcBENode = recurrence.back();
|
|
destBENode = recurrence.front();
|
|
|
|
//FIXME
|
|
if(destBENode->getInEdge(srcBENode).getIteDiff() == 0) {
|
|
//DEBUG(std::cerr << "NOT A BACKEDGE\n");
|
|
//find actual backedge HACK HACK
|
|
for(unsigned i=0; i< recurrence.size()-1; ++i) {
|
|
if(recurrence[i+1]->getInEdge(recurrence[i]).getIteDiff() == 1) {
|
|
srcBENode = recurrence[i];
|
|
destBENode = recurrence[i+1];
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
DEBUG(std::cerr << "Back Edge to Remove: " << *srcBENode << " to " << *destBENode << "\n");
|
|
edgesToIgnore.insert(std::make_pair(srcBENode, destBENode->getInEdgeNum(srcBENode)));
|
|
recurrenceList.insert(std::make_pair(II, recurrence));
|
|
}
|
|
|
|
}
|
|
|
|
void ModuloSchedulingPass::findAllReccurrences(MSchedGraphNode *node,
|
|
std::vector<MSchedGraphNode*> &visitedNodes,
|
|
int II) {
|
|
|
|
if(std::find(visitedNodes.begin(), visitedNodes.end(), node) != visitedNodes.end()) {
|
|
std::vector<MSchedGraphNode*> recurrence;
|
|
bool first = true;
|
|
int delay = 0;
|
|
int distance = 0;
|
|
int RecMII = II; //Starting value
|
|
MSchedGraphNode *last = node;
|
|
MSchedGraphNode *srcBackEdge = 0;
|
|
MSchedGraphNode *destBackEdge = 0;
|
|
|
|
|
|
|
|
for(std::vector<MSchedGraphNode*>::iterator I = visitedNodes.begin(), E = visitedNodes.end();
|
|
I !=E; ++I) {
|
|
|
|
if(*I == node)
|
|
first = false;
|
|
if(first)
|
|
continue;
|
|
|
|
delay = delay + (*I)->getLatency();
|
|
|
|
if(*I != node) {
|
|
int diff = (*I)->getInEdge(last).getIteDiff();
|
|
distance += diff;
|
|
if(diff > 0) {
|
|
srcBackEdge = last;
|
|
destBackEdge = *I;
|
|
}
|
|
}
|
|
|
|
recurrence.push_back(*I);
|
|
last = *I;
|
|
}
|
|
|
|
|
|
|
|
//Get final distance calc
|
|
distance += node->getInEdge(last).getIteDiff();
|
|
|
|
|
|
//Adjust II until we get close to the inequality delay - II*distance <= 0
|
|
|
|
int value = delay-(RecMII * distance);
|
|
int lastII = II;
|
|
while(value <= 0) {
|
|
|
|
lastII = RecMII;
|
|
RecMII--;
|
|
value = delay-(RecMII * distance);
|
|
}
|
|
|
|
|
|
DEBUG(std::cerr << "Final II for this recurrence: " << lastII << "\n");
|
|
addReccurrence(recurrence, lastII, srcBackEdge, destBackEdge);
|
|
assert(distance != 0 && "Recurrence distance should not be zero");
|
|
return;
|
|
}
|
|
|
|
for(MSchedGraphNode::succ_iterator I = node->succ_begin(), E = node->succ_end(); I != E; ++I) {
|
|
visitedNodes.push_back(node);
|
|
findAllReccurrences(*I, visitedNodes, II);
|
|
visitedNodes.pop_back();
|
|
}
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void ModuloSchedulingPass::computePartialOrder() {
|
|
|
|
|
|
//Loop over all recurrences and add to our partial order
|
|
//be sure to remove nodes that are already in the partial order in
|
|
//a different recurrence and don't add empty recurrences.
|
|
for(std::set<std::pair<int, std::vector<MSchedGraphNode*> > >::reverse_iterator I = recurrenceList.rbegin(), E=recurrenceList.rend(); I !=E; ++I) {
|
|
|
|
//Add nodes that connect this recurrence to the previous recurrence
|
|
|
|
//If this is the first recurrence in the partial order, add all predecessors
|
|
for(std::vector<MSchedGraphNode*>::const_iterator N = I->second.begin(), NE = I->second.end(); N != NE; ++N) {
|
|
|
|
}
|
|
|
|
|
|
std::vector<MSchedGraphNode*> new_recurrence;
|
|
//Loop through recurrence and remove any nodes already in the partial order
|
|
for(std::vector<MSchedGraphNode*>::const_iterator N = I->second.begin(), NE = I->second.end(); N != NE; ++N) {
|
|
bool found = false;
|
|
for(std::vector<std::vector<MSchedGraphNode*> >::iterator PO = partialOrder.begin(), PE = partialOrder.end(); PO != PE; ++PO) {
|
|
if(std::find(PO->begin(), PO->end(), *N) != PO->end())
|
|
found = true;
|
|
}
|
|
if(!found) {
|
|
new_recurrence.push_back(*N);
|
|
|
|
if(partialOrder.size() == 0)
|
|
//For each predecessors, add it to this recurrence ONLY if it is not already in it
|
|
for(MSchedGraphNode::pred_iterator P = (*N)->pred_begin(),
|
|
PE = (*N)->pred_end(); P != PE; ++P) {
|
|
|
|
//Check if we are supposed to ignore this edge or not
|
|
if(!ignoreEdge(*P, *N))
|
|
//Check if already in this recurrence
|
|
if(std::find(I->second.begin(), I->second.end(), *P) == I->second.end()) {
|
|
//Also need to check if in partial order
|
|
bool predFound = false;
|
|
for(std::vector<std::vector<MSchedGraphNode*> >::iterator PO = partialOrder.begin(), PEND = partialOrder.end(); PO != PEND; ++PO) {
|
|
if(std::find(PO->begin(), PO->end(), *P) != PO->end())
|
|
predFound = true;
|
|
}
|
|
|
|
if(!predFound)
|
|
if(std::find(new_recurrence.begin(), new_recurrence.end(), *P) == new_recurrence.end())
|
|
new_recurrence.push_back(*P);
|
|
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
if(new_recurrence.size() > 0)
|
|
partialOrder.push_back(new_recurrence);
|
|
}
|
|
|
|
//Add any nodes that are not already in the partial order
|
|
std::vector<MSchedGraphNode*> lastNodes;
|
|
for(std::map<MSchedGraphNode*, MSNodeAttributes>::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::vector<MSchedGraphNode*> >::iterator PO = partialOrder.begin(), PE = partialOrder.end(); PO != PE; ++PO) {
|
|
if(std::find(PO->begin(), PO->end(), I->first) != PO->end())
|
|
found = true;
|
|
}
|
|
if(!found)
|
|
lastNodes.push_back(I->first);
|
|
}
|
|
|
|
if(lastNodes.size() > 0)
|
|
partialOrder.push_back(lastNodes);
|
|
|
|
}
|
|
|
|
|
|
void ModuloSchedulingPass::predIntersect(std::vector<MSchedGraphNode*> &CurrentSet, std::vector<MSchedGraphNode*> &IntersectResult) {
|
|
|
|
//Sort CurrentSet so we can use lowerbound
|
|
std::sort(CurrentSet.begin(), CurrentSet.end());
|
|
|
|
for(unsigned j=0; j < FinalNodeOrder.size(); ++j) {
|
|
for(MSchedGraphNode::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(std::find(CurrentSet.begin(),
|
|
CurrentSet.end(), *P) != CurrentSet.end())
|
|
if(std::find(FinalNodeOrder.begin(), FinalNodeOrder.end(), *P) == FinalNodeOrder.end())
|
|
IntersectResult.push_back(*P);
|
|
}
|
|
}
|
|
}
|
|
|
|
void ModuloSchedulingPass::succIntersect(std::vector<MSchedGraphNode*> &CurrentSet, std::vector<MSchedGraphNode*> &IntersectResult) {
|
|
|
|
//Sort CurrentSet so we can use lowerbound
|
|
std::sort(CurrentSet.begin(), CurrentSet.end());
|
|
|
|
for(unsigned j=0; j < FinalNodeOrder.size(); ++j) {
|
|
for(MSchedGraphNode::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(std::find(CurrentSet.begin(),
|
|
CurrentSet.end(), *P) != CurrentSet.end())
|
|
if(std::find(FinalNodeOrder.begin(), FinalNodeOrder.end(), *P) == FinalNodeOrder.end())
|
|
IntersectResult.push_back(*P);
|
|
}
|
|
}
|
|
}
|
|
|
|
void dumpIntersection(std::vector<MSchedGraphNode*> &IntersectCurrent) {
|
|
std::cerr << "Intersection (";
|
|
for(std::vector<MSchedGraphNode*>::iterator I = IntersectCurrent.begin(), E = IntersectCurrent.end(); I != E; ++I)
|
|
std::cerr << **I << ", ";
|
|
std::cerr << ")\n";
|
|
}
|
|
|
|
|
|
|
|
void ModuloSchedulingPass::orderNodes() {
|
|
|
|
int BOTTOM_UP = 0;
|
|
int TOP_DOWN = 1;
|
|
|
|
//Set default order
|
|
int order = BOTTOM_UP;
|
|
|
|
|
|
//Loop over all the sets and place them in the final node order
|
|
for(std::vector<std::vector<MSchedGraphNode*> >::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::vector<MSchedGraphNode*> 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
|
|
MSchedGraphNode *node;
|
|
int maxASAP = 0;
|
|
DEBUG(std::cerr << "Using current set of size " << CurrentSet->size() << "to find max ASAP\n");
|
|
for(unsigned j=0; j < CurrentSet->size(); ++j) {
|
|
//Get node attributes
|
|
MSNodeAttributes nodeAttr= nodeToAttributesMap.find((*CurrentSet)[j])->second;
|
|
//assert(nodeAttr != nodeToAttributesMap.end() && "Node not in attributes map!");
|
|
DEBUG(std::cerr << "CurrentSet index " << j << "has ASAP: " << nodeAttr.ASAP << "\n");
|
|
if(maxASAP < nodeAttr.ASAP) {
|
|
maxASAP = nodeAttr.ASAP;
|
|
node = (*CurrentSet)[j];
|
|
}
|
|
}
|
|
assert(node != 0 && "In node ordering node should not be null");
|
|
IntersectCurrent.push_back(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;
|
|
MSchedGraphNode *highestHeightNode = IntersectCurrent[0];
|
|
|
|
//Find node in intersection with highest heigh and lowest MOB
|
|
for(std::vector<MSchedGraphNode*>::iterator I = IntersectCurrent.begin(),
|
|
E = IntersectCurrent.end(); I != E; ++I) {
|
|
|
|
//Get current nodes properties
|
|
MSNodeAttributes 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(MSchedGraphNode::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(std::find(IntersectCurrent.begin(), IntersectCurrent.end(), *P) == IntersectCurrent.end())
|
|
IntersectCurrent.push_back(*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;
|
|
MSchedGraphNode *highestDepthNode = IntersectCurrent[0];
|
|
|
|
for(std::vector<MSchedGraphNode*>::iterator I = IntersectCurrent.begin(),
|
|
E = IntersectCurrent.end(); I != E; ++I) {
|
|
//Find node attribute in graph
|
|
MSNodeAttributes 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(std::find(IntersectCurrent.begin(),
|
|
IntersectCurrent.end(),highestDepthNode));
|
|
|
|
|
|
//Intersect heightDepthNode's pred with CurrentSet
|
|
for(MSchedGraphNode::pred_iterator P = highestDepthNode->pred_begin(),
|
|
E = highestDepthNode->pred_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(*P, highestDepthNode))
|
|
continue;
|
|
|
|
//If not already in Intersect, add
|
|
if(std::find(IntersectCurrent.begin(),
|
|
IntersectCurrent.end(), *P) == IntersectCurrent.end())
|
|
IntersectCurrent.push_back(*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::vector<MSchedGraphNode*> > ::reverse_iterator LastSet = partialOrder.rbegin();
|
|
for(std::vector<MSchedGraphNode*>::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 ModuloSchedulingPass::computeSchedule() {
|
|
|
|
bool success = false;
|
|
|
|
while(!success) {
|
|
|
|
//Loop over the final node order and process each node
|
|
for(std::vector<MSchedGraphNode*>::iterator I = FinalNodeOrder.begin(),
|
|
E = FinalNodeOrder.end(); I != E; ++I) {
|
|
|
|
//CalculateEarly and Late start
|
|
int EarlyStart = -1;
|
|
int LateStart = 99999; //Set to something higher then we would ever expect (FIXME)
|
|
bool hasSucc = false;
|
|
bool hasPred = false;
|
|
|
|
if(!(*I)->isBranch()) {
|
|
//Loop over nodes in the schedule and determine if they are predecessors
|
|
//or successors of the node we are trying to schedule
|
|
for(MSSchedule::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<MSchedGraphNode*>::iterator schedNode = nodesByCycle->second.begin(), SNE = nodesByCycle->second.end(); schedNode != SNE; ++schedNode) {
|
|
|
|
if((*I)->isPredecessor(*schedNode)) {
|
|
if(!ignoreEdge(*schedNode, *I)) {
|
|
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");
|
|
EarlyStart = std::max(EarlyStart, ES_Temp);
|
|
hasPred = true;
|
|
}
|
|
}
|
|
if((*I)->isSuccessor(*schedNode)) {
|
|
if(!ignoreEdge(*I,*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");
|
|
LateStart = std::min(LateStart, LS_Temp);
|
|
hasSucc = true;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
//WARNING: HACK! FIXME!!!!
|
|
if((*I)->getInst()->getOpcode() == V9::BA) {
|
|
EarlyStart = II-1;
|
|
LateStart = II-1;
|
|
}
|
|
else {
|
|
EarlyStart = II-1;
|
|
LateStart = II-1;
|
|
assert( (EarlyStart >= 0) && (LateStart >=0) && "EarlyStart and LateStart must be greater then 0");
|
|
}
|
|
hasPred = 1;
|
|
hasSucc = 1;
|
|
}
|
|
|
|
|
|
DEBUG(std::cerr << "Has Successors: " << hasSucc << ", Has Pred: " << hasPred << "\n");
|
|
DEBUG(std::cerr << "EarlyStart: " << EarlyStart << ", LateStart: " << LateStart << "\n");
|
|
|
|
//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;
|
|
|
|
//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)
|
|
success = scheduleNode(*I, EarlyStart, std::min(LateStart, (EarlyStart + II -1)));
|
|
else
|
|
success = scheduleNode(*I, EarlyStart, EarlyStart + II - 1);
|
|
|
|
if(!success) {
|
|
++II;
|
|
schedule.clear();
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
DEBUG(std::cerr << "Constructing Kernel\n");
|
|
success = schedule.constructKernel(II);
|
|
if(!success) {
|
|
++II;
|
|
schedule.clear();
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
bool ModuloSchedulingPass::scheduleNode(MSchedGraphNode *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);
|
|
|
|
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 ModuloSchedulingPass::writePrologues(std::vector<MachineBasicBlock *> &prologues, MachineBasicBlock *origBB, std::vector<BasicBlock*> &llvm_prologues, std::map<const Value*, std::pair<const MSchedGraphNode*, 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;
|
|
|
|
MSchedGraphNode *branch = 0;
|
|
|
|
|
|
for(MSSchedule::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
|
|
maxStageCount = std::max(maxStageCount, I->second);
|
|
|
|
//Ignore the branch, we will handle this separately
|
|
if(I->first->isBranch()) {
|
|
if (I->first->getInst()->getOpcode() != V9::BA)
|
|
branch = I->first;
|
|
continue;
|
|
}
|
|
|
|
//Put int the map so we know what instructions in each stage are in the kernel
|
|
DEBUG(std::cerr << "Inserting instruction " << *(I->first->getInst()) << " into map at stage " << I->second << "\n");
|
|
inKernel[I->second].insert(I->first->getInst());
|
|
}
|
|
|
|
//Get target information to look at machine operands
|
|
const TargetInstrInfo *mii = target.getInstrInfo();
|
|
|
|
//Now write the prologues
|
|
for(int i = 0; i < maxStageCount; ++i) {
|
|
BasicBlock *llvmBB = new BasicBlock("PROLOGUE", (Function*) (origBB->getBasicBlock()->getParent()));
|
|
MachineBasicBlock *machineBB = new MachineBasicBlock(llvmBB);
|
|
|
|
DEBUG(std::cerr << "i=" << i << "\n");
|
|
for(int j = 0; j <= i; ++j) {
|
|
for(MachineBasicBlock::const_iterator MI = origBB->begin(), ME = origBB->end(); ME != MI; ++MI) {
|
|
if(inKernel[j].count(&*MI)) {
|
|
MachineInstr *instClone = MI->clone();
|
|
machineBB->push_back(instClone);
|
|
|
|
DEBUG(std::cerr << "Cloning: " << *MI << "\n");
|
|
|
|
Instruction *tmp;
|
|
|
|
//After cloning, we may need to save the value that this instruction defines
|
|
for(unsigned opNum=0; opNum < MI->getNumOperands(); ++opNum) {
|
|
//get machine operand
|
|
const 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());
|
|
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get((Instruction*) mOp.getVRegValue());
|
|
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 = 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(j-1)) {
|
|
DEBUG(std::cerr << "Replaced this value: " << mOp.getVRegValue() << " With:" << (newValues[mOp.getVRegValue()][i-1]) << "\n");
|
|
//Update the operand with the right value
|
|
instClone->getOperand(opNum).setValueReg(newValues[mOp.getVRegValue()][i-1]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
//Stick in branch at the end
|
|
machineBB->push_back(branch->getInst()->clone());
|
|
|
|
|
|
(((MachineBasicBlock*)origBB)->getParent())->getBasicBlockList().push_back(machineBB);
|
|
prologues.push_back(machineBB);
|
|
llvm_prologues.push_back(llvmBB);
|
|
}
|
|
}
|
|
|
|
void ModuloSchedulingPass::writeEpilogues(std::vector<MachineBasicBlock *> &epilogues, const MachineBasicBlock *origBB, std::vector<BasicBlock*> &llvm_epilogues, std::map<const Value*, std::pair<const MSchedGraphNode*, 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;
|
|
|
|
for(MSSchedule::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
|
|
|
|
//Ignore the branch, we will handle this separately
|
|
if(I->first->isBranch())
|
|
continue;
|
|
|
|
//Put int the map so we know what instructions in each stage are in the kernel
|
|
inKernel[I->second].insert(I->first->getInst());
|
|
}
|
|
|
|
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";
|
|
});
|
|
|
|
//some debug stuff, will remove later
|
|
DEBUG(for(std::map<Value*, std::map<int, Value*> >::iterator V = kernelPHIs.begin(), E = kernelPHIs.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) {
|
|
BasicBlock *llvmBB = new BasicBlock("EPILOGUE", (Function*) (origBB->getBasicBlock()->getParent()));
|
|
MachineBasicBlock *machineBB = new MachineBasicBlock(llvmBB);
|
|
|
|
DEBUG(std::cerr << " Epilogue #: " << i << "\n");
|
|
|
|
|
|
std::map<Value*, int> inEpilogue;
|
|
|
|
for(MachineBasicBlock::const_iterator MI = origBB->begin(), ME = origBB->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((Instruction*) mOp.getVRegValue());
|
|
tempMvec.addTemp((Value*) tmp);
|
|
|
|
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);
|
|
}
|
|
}
|
|
}
|
|
|
|
(((MachineBasicBlock*)origBB)->getParent())->getBasicBlockList().push_back(machineBB);
|
|
epilogues.push_back(machineBB);
|
|
llvm_epilogues.push_back(llvmBB);
|
|
|
|
DEBUG(std::cerr << "EPILOGUE #" << i << "\n");
|
|
DEBUG(machineBB->print(std::cerr));
|
|
}
|
|
}
|
|
|
|
void ModuloSchedulingPass::writeKernel(BasicBlock *llvmBB, MachineBasicBlock *machineBB, std::map<const Value*, std::pair<const MSchedGraphNode*, 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;
|
|
|
|
//Create TmpInstructions for the final phis
|
|
for(MSSchedule::kernel_iterator I = schedule.kernel_begin(), E = schedule.kernel_end(); I != E; ++I) {
|
|
|
|
DEBUG(std::cerr << "Stage: " << I->second << " Inst: " << *(I->first->getInst()) << "\n";);
|
|
|
|
//Clone instruction
|
|
const MachineInstr *inst = I->first->getInst();
|
|
MachineInstr *instClone = inst->clone();
|
|
|
|
//Insert into machine basic block
|
|
machineBB->push_back(instClone);
|
|
|
|
if(I->first->isBranch()) {
|
|
//Add kernel noop
|
|
BuildMI(machineBB, V9::NOP, 0);
|
|
}
|
|
|
|
//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())) {
|
|
TmpInstruction *tmp = new TmpInstruction(mOp.getVRegValue());
|
|
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get((Instruction*) mOp.getVRegValue());
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
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((Instruction*) mOp.getVRegValue());
|
|
tempVec.addTemp((Value*) tmp);
|
|
|
|
//Create new machine instr and put in MBB
|
|
MachineInstr *saveValue = BuildMI(machineBB, V9::ORr, 3).addReg(mOp.getVRegValue()).addImm(0).addRegDef(tmp);
|
|
|
|
//Save for future cleanup
|
|
kernelValue[mOp.getVRegValue()] = tmp;
|
|
newValLocation[tmp] = machineBB;
|
|
kernelPHIs[mOp.getVRegValue()][schedule.getMaxStage()-1] = tmp;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
DEBUG(std::cerr << "KERNEL before PHIs\n");
|
|
DEBUG(machineBB->print(std::cerr));
|
|
|
|
|
|
//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, machineBB->begin(),V9::PHI, 3).addReg(V->second.begin()->second).addReg(kernelValue[V->first]).addRegDef(finalPHIValue[V->first]);
|
|
DEBUG(std::cerr << "Resulting PHI: " << *saveValue << "\n");
|
|
kernelPHIs[V->first][schedule.getMaxStage()-1] = kernelValue[V->first];
|
|
}
|
|
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((Instruction*) V->first);
|
|
tempMvec.addTemp((Value*) lastPhi);
|
|
|
|
MachineInstr *saveValue = BuildMI(*machineBB, machineBB->begin(), V9::PHI, 3).addReg(kernelValue[V->first]).addReg(I->second).addRegDef(lastPhi);
|
|
DEBUG(std::cerr << "Resulting PHI: " << *saveValue << "\n");
|
|
newValLocation[lastPhi] = machineBB;
|
|
}
|
|
else {
|
|
Instruction *tmp = new TmpInstruction(I->second);
|
|
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get((Instruction*) V->first);
|
|
tempMvec.addTemp((Value*) tmp);
|
|
|
|
|
|
MachineInstr *saveValue = BuildMI(*machineBB, machineBB->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;
|
|
}
|
|
}
|
|
//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, machineBB->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;
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
DEBUG(std::cerr << "KERNEL after PHIs\n");
|
|
DEBUG(machineBB->print(std::cerr));
|
|
}
|
|
|
|
|
|
void ModuloSchedulingPass::removePHIs(const MachineBasicBlock *origBB, std::vector<MachineBasicBlock *> &prologues, std::vector<MachineBasicBlock *> &epilogues, 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
|
|
for(MachineBasicBlock::iterator I = kernelBB->begin(), E = kernelBB->end(); I != E; ++I) {
|
|
|
|
//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 {
|
|
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()));
|
|
BuildMI(*kernelBB, I, V9::ORr, 3).addReg(tmp).addImm(0).addRegDef(mOp.getVRegValue());
|
|
worklist.push_back(std::make_pair(kernelBB, I));
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
else {
|
|
//We found an instruction that we can add to its mcfi
|
|
if(addToMCFI.size() > 0) {
|
|
for(unsigned i = 0; i < I->getNumOperands(); ++i) {
|
|
const MachineOperand &mOp = I->getOperand(i);
|
|
if(mOp.getType() == MachineOperand::MO_VirtualRegister) {
|
|
if(!isa<TmpInstruction>(mOp.getVRegValue()) && !isa<PHINode>(mOp.getVRegValue())) {
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get((Instruction*) mOp.getVRegValue());
|
|
for(unsigned x = 0; x < addToMCFI.size(); ++x) {
|
|
tempMvec.addTemp(addToMCFI[x]);
|
|
}
|
|
addToMCFI.clear();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
//for(std::vector<std::pair<Instruction*, Value*> >::reverse_iterator I = newORs.rbegin(), IE = newORs.rend(); I != IE; ++I)
|
|
//BuildMI(*kernelBB, kernelBB->begin(), V9::ORr, 3).addReg(I->first).addImm(0).addRegDef(I->second);
|
|
|
|
//Remove phis from epilogue
|
|
for(std::vector<MachineBasicBlock*>::iterator MB = epilogues.begin(), ME = epilogues.end(); MB != ME; ++MB) {
|
|
for(MachineBasicBlock::iterator I = (*MB)->begin(), E = (*MB)->end(); I != E; ++I) {
|
|
//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 {
|
|
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");
|
|
BuildMI(**MB, I, V9::ORr, 3).addReg(tmp).addImm(0).addRegDef(mOp.getVRegValue());
|
|
worklist.push_back(std::make_pair(*MB,I));
|
|
}
|
|
|
|
}
|
|
}
|
|
|
|
else {
|
|
//We found an instruction that we can add to its mcfi
|
|
if(addToMCFI.size() > 0) {
|
|
for(unsigned i = 0; i < I->getNumOperands(); ++i) {
|
|
const MachineOperand &mOp = I->getOperand(i);
|
|
if(mOp.getType() == MachineOperand::MO_VirtualRegister) {
|
|
|
|
if(!isa<TmpInstruction>(mOp.getVRegValue()) && !isa<PHINode>(mOp.getVRegValue())) {
|
|
//Get machine code for this instruction
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get((Instruction*) mOp.getVRegValue());
|
|
for(unsigned x = 0; x < addToMCFI.size(); ++x) {
|
|
tempMvec.addTemp(addToMCFI[x]);
|
|
}
|
|
addToMCFI.clear();
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//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 ModuloSchedulingPass::reconstructLoop(MachineBasicBlock *BB) {
|
|
|
|
DEBUG(std::cerr << "Reconstructing Loop\n");
|
|
|
|
//First find the value *'s that we need to "save"
|
|
std::map<const Value*, std::pair<const MSchedGraphNode*, 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;
|
|
|
|
//Loop over kernel and only look at instructions from a stage > 0
|
|
//Look at its operands and save values *'s that are read
|
|
for(MSSchedule::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->getInst();
|
|
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()) {
|
|
|
|
//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;
|
|
|
|
//Get Machine code for this instruction, and loop backwards over the array
|
|
//to find the def
|
|
MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(defInst);
|
|
for (int j = tempMvec.size()-1; j >= 0; j--) {
|
|
MachineInstr *temp = tempMvec[j];
|
|
|
|
//Loop over instructions
|
|
for(unsigned opNum = 0; opNum < temp->getNumOperands(); ++opNum) {
|
|
MachineOperand &mDefOp = temp->getOperand(opNum);
|
|
|
|
if (mDefOp.getType() == MachineOperand::MO_VirtualRegister && mDefOp.isDef()) {
|
|
const Value* defVReg = mDefOp.getVRegValue();
|
|
if(defVReg == srcI) {
|
|
//Check if instruction has been seen already and is of same stage
|
|
if(lastInstrs.count(temp)) {
|
|
if(lastInstrs[temp] == 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");
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//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<MachineBasicBlock*> prologues;
|
|
std::vector<BasicBlock*> llvm_prologues;
|
|
|
|
|
|
//Write prologue
|
|
writePrologues(prologues, BB, llvm_prologues, valuesToSave, newValues, newValLocation);
|
|
|
|
//Print out epilogues and prologue
|
|
DEBUG(for(std::vector<MachineBasicBlock*>::iterator I = prologues.begin(), E = prologues.end();
|
|
I != E; ++I) {
|
|
std::cerr << "PROLOGUE\n";
|
|
(*I)->print(std::cerr);
|
|
});
|
|
|
|
BasicBlock *llvmKernelBB = new BasicBlock("Kernel", (Function*) (BB->getBasicBlock()->getParent()));
|
|
MachineBasicBlock *machineKernelBB = new MachineBasicBlock(llvmKernelBB);
|
|
(((MachineBasicBlock*)BB)->getParent())->getBasicBlockList().push_back(machineKernelBB);
|
|
writeKernel(llvmKernelBB, machineKernelBB, valuesToSave, newValues, newValLocation, kernelPHIs);
|
|
|
|
|
|
std::vector<MachineBasicBlock*> epilogues;
|
|
std::vector<BasicBlock*> llvm_epilogues;
|
|
|
|
//Write epilogues
|
|
writeEpilogues(epilogues, BB, llvm_epilogues, valuesToSave, newValues, newValLocation, kernelPHIs);
|
|
|
|
|
|
const TargetInstrInfo *TMI = target.getInstrInfo();
|
|
|
|
//Fix up machineBB and llvmBB branches
|
|
for(unsigned I = 0; I < prologues.size(); ++I) {
|
|
|
|
MachineInstr *branch = 0;
|
|
|
|
//Find terminator since getFirstTerminator does not work!
|
|
for(MachineBasicBlock::reverse_iterator mInst = prologues[I]->rbegin(), mInstEnd = prologues[I]->rend(); mInst != mInstEnd; ++mInst) {
|
|
MachineOpCode OC = mInst->getOpcode();
|
|
if(TMI->isBranch(OC)) {
|
|
branch = &*mInst;
|
|
DEBUG(std::cerr << *mInst << "\n");
|
|
break;
|
|
}
|
|
}
|
|
|
|
//Update branch
|
|
for(unsigned opNum = 0; opNum < branch->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = branch->getOperand(opNum);
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
mOp.setValueReg(llvm_epilogues[(llvm_epilogues.size()-1-I)]);
|
|
|
|
}
|
|
}
|
|
|
|
//Update llvm basic block with our new branch instr
|
|
DEBUG(std::cerr << BB->getBasicBlock()->getTerminator() << "\n");
|
|
const BranchInst *branchVal = dyn_cast<BranchInst>(BB->getBasicBlock()->getTerminator());
|
|
//TmpInstruction *tmp = new TmpInstruction(branchVal->getCondition());
|
|
|
|
//Add TmpInstruction to original branches MCFI
|
|
//MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(branchVal);
|
|
//tempMvec.addTemp((Value*) tmp);
|
|
|
|
if(I == prologues.size()-1) {
|
|
TerminatorInst *newBranch = new BranchInst(llvmKernelBB,
|
|
llvm_epilogues[(llvm_epilogues.size()-1-I)],
|
|
branchVal->getCondition(),
|
|
llvm_prologues[I]);
|
|
}
|
|
else
|
|
TerminatorInst *newBranch = new BranchInst(llvm_prologues[I+1],
|
|
llvm_epilogues[(llvm_epilogues.size()-1-I)],
|
|
branchVal->getCondition(),
|
|
llvm_prologues[I]);
|
|
|
|
assert(branch != 0 && "There must be a terminator for this machine basic block!\n");
|
|
|
|
//Push nop onto end of machine basic block
|
|
BuildMI(prologues[I], V9::NOP, 0);
|
|
|
|
//Add a unconditional branch to the next prologue
|
|
if(I != prologues.size()-1) {
|
|
BuildMI(prologues[I], V9::BA, 1).addPCDisp(llvm_prologues[I+1]);
|
|
}
|
|
else
|
|
BuildMI(prologues[I], V9::BA, 1).addPCDisp(llvmKernelBB);
|
|
|
|
//Add one more nop!
|
|
BuildMI(prologues[I], V9::NOP, 0);
|
|
}
|
|
|
|
//Fix up kernel machine branches
|
|
MachineInstr *branch = 0;
|
|
MachineInstr *BAbranch = 0;
|
|
|
|
for(MachineBasicBlock::reverse_iterator mInst = machineKernelBB->rbegin(), mInstEnd = machineKernelBB->rend(); mInst != mInstEnd; ++mInst) {
|
|
MachineOpCode OC = mInst->getOpcode();
|
|
if(TMI->isBranch(OC)) {
|
|
if(mInst->getOpcode() == V9::BA) {
|
|
BAbranch = &*mInst;
|
|
}
|
|
else {
|
|
branch = &*mInst;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
assert(branch != 0 && "There must be a terminator for the kernel machine basic block!\n");
|
|
|
|
//Update kernel self loop branch
|
|
for(unsigned opNum = 0; opNum < branch->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = branch->getOperand(opNum);
|
|
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
mOp.setValueReg(llvmKernelBB);
|
|
}
|
|
}
|
|
|
|
Value *origBAVal = 0;
|
|
|
|
//Update kernel BA branch
|
|
for(unsigned opNum = 0; opNum < BAbranch->getNumOperands(); ++opNum) {
|
|
MachineOperand &mOp = BAbranch->getOperand(opNum);
|
|
if (mOp.getType() == MachineOperand::MO_PCRelativeDisp) {
|
|
origBAVal = mOp.getVRegValue();
|
|
if(llvm_epilogues.size() > 0)
|
|
mOp.setValueReg(llvm_epilogues[0]);
|
|
|
|
}
|
|
}
|
|
|
|
assert((origBAVal != 0) && "Could not find original branch always value");
|
|
|
|
//Update kernelLLVM branches
|
|
const BranchInst *branchVal = dyn_cast<BranchInst>(BB->getBasicBlock()->getTerminator());
|
|
//TmpInstruction *tmp = new TmpInstruction(branchVal->getCondition());
|
|
|
|
//Add TmpInstruction to original branches MCFI
|
|
//MachineCodeForInstruction & tempMvec = MachineCodeForInstruction::get(branchVal);
|
|
//tempMvec.addTemp((Value*) tmp);
|
|
|
|
TerminatorInst *newBranch = new BranchInst(llvmKernelBB,
|
|
llvm_epilogues[0],
|
|
branchVal->getCondition(),
|
|
llvmKernelBB);
|
|
|
|
|
|
//Lastly add unconditional branches for the epilogues
|
|
for(unsigned I = 0; I < epilogues.size(); ++I) {
|
|
|
|
//Now since we don't have fall throughs, add a unconditional branch to the next prologue
|
|
if(I != epilogues.size()-1) {
|
|
BuildMI(epilogues[I], V9::BA, 1).addPCDisp(llvm_epilogues[I+1]);
|
|
//Add unconditional branch to end of epilogue
|
|
TerminatorInst *newBranch = new BranchInst(llvm_epilogues[I+1],
|
|
llvm_epilogues[I]);
|
|
|
|
}
|
|
else {
|
|
BuildMI(epilogues[I], V9::BA, 1).addPCDisp(origBAVal);
|
|
|
|
|
|
//Update last epilogue exit branch
|
|
BranchInst *branchVal = (BranchInst*) dyn_cast<BranchInst>(BB->getBasicBlock()->getTerminator());
|
|
//Find where we are supposed to branch to
|
|
BasicBlock *nextBlock = 0;
|
|
for(unsigned j=0; j <branchVal->getNumSuccessors(); ++j) {
|
|
if(branchVal->getSuccessor(j) != BB->getBasicBlock())
|
|
nextBlock = branchVal->getSuccessor(j);
|
|
}
|
|
|
|
assert((nextBlock != 0) && "Next block should not be null!");
|
|
TerminatorInst *newBranch = new BranchInst(nextBlock, llvm_epilogues[I]);
|
|
}
|
|
//Add one more nop!
|
|
BuildMI(epilogues[I], V9::NOP, 0);
|
|
|
|
}
|
|
|
|
//FIX UP Machine BB entry!!
|
|
//We are looking at the predecesor of our loop basic block and we want to change its ba instruction
|
|
|
|
|
|
//Find all llvm basic blocks that branch to the loop entry and change to our first prologue.
|
|
const BasicBlock *llvmBB = BB->getBasicBlock();
|
|
|
|
for(pred_const_iterator P = pred_begin(llvmBB), PE = pred_end(llvmBB); P != PE; ++PE) {
|
|
if(*P == llvmBB)
|
|
continue;
|
|
else {
|
|
DEBUG(std::cerr << "Found our entry BB\n");
|
|
//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]);
|
|
//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) {
|
|
mOp.setValueReg(llvm_prologues[0]);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
term->setSuccessor(i, llvmKernelBB);
|
|
//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) {
|
|
mOp.setValueReg(llvmKernelBB);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
removePHIs(BB, prologues, epilogues, machineKernelBB, newValLocation);
|
|
|
|
|
|
|
|
//Print out epilogues and prologue
|
|
DEBUG(for(std::vector<MachineBasicBlock*>::iterator I = prologues.begin(), E = prologues.end();
|
|
I != E; ++I) {
|
|
std::cerr << "PROLOGUE\n";
|
|
(*I)->print(std::cerr);
|
|
});
|
|
|
|
DEBUG(std::cerr << "KERNEL\n");
|
|
DEBUG(machineKernelBB->print(std::cerr));
|
|
|
|
DEBUG(for(std::vector<MachineBasicBlock*>::iterator I = epilogues.begin(), E = epilogues.end();
|
|
I != E; ++I) {
|
|
std::cerr << "EPILOGUE\n";
|
|
(*I)->print(std::cerr);
|
|
});
|
|
|
|
|
|
DEBUG(std::cerr << "New Machine Function" << "\n");
|
|
DEBUG(std::cerr << BB->getParent() << "\n");
|
|
|
|
//BB->getParent()->getBasicBlockList().erase(BB);
|
|
|
|
}
|
|
|