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399 lines
15 KiB
C++
399 lines
15 KiB
C++
//===-- MSchedGraph.h - Scheduling Graph ------------------------*- 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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// A graph class for dependencies. This graph only contains true, anti, and
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// output data dependencies for a given MachineBasicBlock. Dependencies
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// across iterations are also computed. Unless data dependence analysis
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// is provided, a conservative approach of adding dependencies between all
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// loads and stores is taken.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MSCHEDGRAPH_H
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#define LLVM_MSCHEDGRAPH_H
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#include "DependenceAnalyzer.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/ADT/GraphTraits.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/iterator"
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#include <vector>
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namespace llvm {
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class MSchedGraph;
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class MSchedGraphNode;
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template<class IteratorType, class NodeType>
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class MSchedGraphNodeIterator;
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//MSchedGraphEdge encapsulates the data dependence between nodes. It
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//identifies the dependence type, on what, and the iteration
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//difference
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struct MSchedGraphEdge {
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enum DataDepOrderType {
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TrueDep, AntiDep, OutputDep, NonDataDep
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};
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enum MSchedGraphEdgeType {
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MemoryDep, ValueDep, MachineRegister, BranchDep
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};
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//Get or set edge data
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MSchedGraphNode *getDest() const { return dest; }
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unsigned getIteDiff() { return iteDiff; }
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unsigned getDepOrderType() { return depOrderType; }
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void setDest(MSchedGraphNode *newDest) { dest = newDest; }
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private:
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friend class MSchedGraphNode;
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MSchedGraphEdge(MSchedGraphNode *destination, MSchedGraphEdgeType type,
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unsigned deptype, unsigned diff)
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: dest(destination), depType(type), depOrderType(deptype), iteDiff(diff) {}
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MSchedGraphNode *dest;
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MSchedGraphEdgeType depType;
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unsigned depOrderType;
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unsigned iteDiff;
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};
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//MSchedGraphNode represents a machine instruction and its
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//corresponding latency. Each node also contains a list of its
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//predecessors and sucessors.
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class MSchedGraphNode {
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const MachineInstr* Inst; //Machine Instruction
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MSchedGraph* Parent; //Graph this node belongs to
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unsigned index; //Index in BB
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unsigned latency; //Latency of Instruction
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bool isBranchInstr; //Is this node the branch instr or not
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std::vector<MSchedGraphNode*> Predecessors; //Predecessor Nodes
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std::vector<MSchedGraphEdge> Successors; //Successor edges
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public:
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MSchedGraphNode(const MachineInstr *inst, MSchedGraph *graph,
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unsigned index, unsigned late=0, bool isBranch=false);
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MSchedGraphNode(const MSchedGraphNode &N);
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//Iterators - Predecessor and Succussor
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typedef std::vector<MSchedGraphNode*>::iterator pred_iterator;
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pred_iterator pred_begin() { return Predecessors.begin(); }
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pred_iterator pred_end() { return Predecessors.end(); }
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unsigned pred_size() { return Predecessors.size(); }
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typedef std::vector<MSchedGraphNode*>::const_iterator pred_const_iterator;
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pred_const_iterator pred_begin() const { return Predecessors.begin(); }
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pred_const_iterator pred_end() const { return Predecessors.end(); }
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typedef MSchedGraphNodeIterator<std::vector<MSchedGraphEdge>::const_iterator,
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const MSchedGraphNode> succ_const_iterator;
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succ_const_iterator succ_begin() const;
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succ_const_iterator succ_end() const;
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typedef MSchedGraphNodeIterator<std::vector<MSchedGraphEdge>::iterator,
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MSchedGraphNode> succ_iterator;
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succ_iterator succ_begin();
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succ_iterator succ_end();
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unsigned succ_size() { return Successors.size(); }
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//Get or set predecessor nodes, or successor edges
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void setPredecessor(unsigned index, MSchedGraphNode *dest) {
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Predecessors[index] = dest;
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}
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MSchedGraphNode* getPredecessor(unsigned index) {
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return Predecessors[index];
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}
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MSchedGraphEdge* getSuccessor(unsigned index) {
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return &Successors[index];
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}
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void deleteSuccessor(MSchedGraphNode *node) {
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for (unsigned i = 0; i != Successors.size(); ++i)
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if (Successors[i].getDest() == node) {
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Successors.erase(Successors.begin()+i);
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node->Predecessors.erase(std::find(node->Predecessors.begin(),
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node->Predecessors.end(), this));
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--i; //Decrease index var since we deleted a node
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}
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}
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void addOutEdge(MSchedGraphNode *destination,
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MSchedGraphEdge::MSchedGraphEdgeType type,
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unsigned deptype, unsigned diff=0) {
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Successors.push_back(MSchedGraphEdge(destination, type, deptype,diff));
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destination->Predecessors.push_back(this);
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}
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//General methods to get and set data for the node
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const MachineInstr* getInst() { return Inst; }
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MSchedGraph* getParent() { return Parent; }
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bool hasPredecessors() { return (Predecessors.size() > 0); }
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bool hasSuccessors() { return (Successors.size() > 0); }
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unsigned getLatency() { return latency; }
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unsigned getLatency() const { return latency; }
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unsigned getIndex() { return index; }
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unsigned getIteDiff(MSchedGraphNode *succ);
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MSchedGraphEdge getInEdge(MSchedGraphNode *pred);
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unsigned getInEdgeNum(MSchedGraphNode *pred);
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bool isSuccessor(MSchedGraphNode *);
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bool isPredecessor(MSchedGraphNode *);
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bool isBranch() { return isBranchInstr; }
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//Debug support
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void print(std::ostream &os) const;
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void setParent(MSchedGraph *p) { Parent = p; }
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};
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//Node iterator for graph generation
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template<class IteratorType, class NodeType>
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class MSchedGraphNodeIterator : public forward_iterator<NodeType*, ptrdiff_t> {
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IteratorType I; // std::vector<MSchedGraphEdge>::iterator or const_iterator
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public:
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MSchedGraphNodeIterator(IteratorType i) : I(i) {}
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bool operator==(const MSchedGraphNodeIterator RHS) const { return I == RHS.I; }
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bool operator!=(const MSchedGraphNodeIterator RHS) const { return I != RHS.I; }
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const MSchedGraphNodeIterator &operator=(const MSchedGraphNodeIterator &RHS) {
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I = RHS.I;
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return *this;
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}
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NodeType* operator*() const {
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return I->getDest();
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}
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NodeType* operator->() const { return operator*(); }
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MSchedGraphNodeIterator& operator++() { // Preincrement
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++I;
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return *this;
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}
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MSchedGraphNodeIterator operator++(int) { // Postincrement
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MSchedGraphNodeIterator tmp = *this; ++*this; return tmp;
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}
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MSchedGraphEdge &getEdge() {
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return *I;
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}
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const MSchedGraphEdge &getEdge() const {
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return *I;
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}
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};
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inline MSchedGraphNode::succ_const_iterator MSchedGraphNode::succ_begin() const {
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return succ_const_iterator(Successors.begin());
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}
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inline MSchedGraphNode::succ_const_iterator MSchedGraphNode::succ_end() const {
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return succ_const_iterator(Successors.end());
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}
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inline MSchedGraphNode::succ_iterator MSchedGraphNode::succ_begin() {
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return succ_iterator(Successors.begin());
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}
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inline MSchedGraphNode::succ_iterator MSchedGraphNode::succ_end() {
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return succ_iterator(Successors.end());
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}
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// ostream << operator for MSGraphNode class
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inline std::ostream &operator<<(std::ostream &os,
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const MSchedGraphNode &node) {
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node.print(os);
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return os;
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}
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// Provide specializations of GraphTraits to be able to use graph
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// iterators on the scheduling graph!
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//
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template <> struct GraphTraits<MSchedGraphNode*> {
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typedef MSchedGraphNode NodeType;
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typedef MSchedGraphNode::succ_iterator ChildIteratorType;
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->succ_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->succ_end();
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}
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static NodeType *getEntryNode(NodeType* N) { return N; }
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};
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//Graph class to represent dependence graph
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class MSchedGraph {
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std::vector<const MachineBasicBlock *> BBs; //Machine basic block
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const TargetMachine &Target; //Target Machine
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//Nodes
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std::map<const MachineInstr*, MSchedGraphNode*> GraphMap;
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//Add Nodes and Edges to this graph for our BB
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typedef std::pair<int, MSchedGraphNode*> OpIndexNodePair;
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void buildNodesAndEdges(std::map<const MachineInstr*, unsigned> &ignoreInstrs, DependenceAnalyzer &DA, std::map<MachineInstr*, Instruction*> &machineTollvm);
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void addValueEdges(std::vector<OpIndexNodePair> &NodesInMap,
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MSchedGraphNode *node,
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bool nodeIsUse, bool nodeIsDef, std::vector<const MachineInstr*> &phiInstrs, int diff=0);
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void addMachRegEdges(std::map<int,
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std::vector<OpIndexNodePair> >& regNumtoNodeMap);
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void addMemEdges(const std::vector<MSchedGraphNode*>& memInst,
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DependenceAnalyzer &DA, std::map<MachineInstr*, Instruction*> &machineTollvm);
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void addBranchEdges();
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public:
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MSchedGraph(const MachineBasicBlock *bb, const TargetMachine &targ,
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std::map<const MachineInstr*, unsigned> &ignoreInstrs,
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DependenceAnalyzer &DA, std::map<MachineInstr*, Instruction*> &machineTollvm);
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//Copy constructor with maps to link old nodes to new nodes
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MSchedGraph(const MSchedGraph &G, std::map<MSchedGraphNode*, MSchedGraphNode*> &newNodes);
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MSchedGraph(std::vector<const MachineBasicBlock*> &bbs,
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const TargetMachine &targ,
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std::map<const MachineInstr*, unsigned> &ignoreInstrs,
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DependenceAnalyzer &DA,
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std::map<MachineInstr*, Instruction*> &machineTollvm);
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//Print graph
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void print(std::ostream &os) const;
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//Deconstructor!
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~MSchedGraph();
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//Add or delete nodes from the Graph
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void addNode(const MachineInstr* MI, MSchedGraphNode *node);
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void deleteNode(MSchedGraphNode *node);
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int totalDelay();
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//iterators
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typedef std::map<const MachineInstr*, MSchedGraphNode*>::iterator iterator;
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typedef std::map<const MachineInstr*, MSchedGraphNode*>::const_iterator const_iterator;
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typedef std::map<const MachineInstr*, MSchedGraphNode*>::reverse_iterator reverse_iterator;
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iterator find(const MachineInstr* I) { return GraphMap.find(I); }
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iterator end() { return GraphMap.end(); }
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iterator begin() { return GraphMap.begin(); }
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unsigned size() { return GraphMap.size(); }
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reverse_iterator rbegin() { return GraphMap.rbegin(); }
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reverse_iterator rend() { return GraphMap.rend(); }
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//Get Target or original machine basic block
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const TargetMachine* getTarget() { return &Target; }
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std::vector<const MachineBasicBlock*> getBBs() { return BBs; }
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};
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// Provide specializations of GraphTraits to be able to use graph
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// iterators on the scheduling graph
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static MSchedGraphNode& getSecond(std::pair<const MachineInstr* const,
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MSchedGraphNode*> &Pair) {
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return *Pair.second;
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}
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template <> struct GraphTraits<MSchedGraph*> {
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typedef MSchedGraphNode NodeType;
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typedef MSchedGraphNode::succ_iterator ChildIteratorType;
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->succ_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->succ_end();
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}
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typedef std::pointer_to_unary_function<std::pair<const MachineInstr* const,
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MSchedGraphNode*>&, MSchedGraphNode&> DerefFun;
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typedef mapped_iterator<MSchedGraph::iterator, DerefFun> nodes_iterator;
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static nodes_iterator nodes_begin(MSchedGraph *G) {
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return map_iterator(((MSchedGraph*)G)->begin(), DerefFun(getSecond));
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}
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static nodes_iterator nodes_end(MSchedGraph *G) {
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return map_iterator(((MSchedGraph*)G)->end(), DerefFun(getSecond));
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}
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};
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template <> struct GraphTraits<const MSchedGraph*> {
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typedef const MSchedGraphNode NodeType;
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typedef MSchedGraphNode::succ_const_iterator ChildIteratorType;
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->succ_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->succ_end();
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}
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typedef std::pointer_to_unary_function<std::pair<const MachineInstr* const,
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MSchedGraphNode*>&, MSchedGraphNode&> DerefFun;
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typedef mapped_iterator<MSchedGraph::iterator, DerefFun> nodes_iterator;
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static nodes_iterator nodes_begin(MSchedGraph *G) {
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return map_iterator(((MSchedGraph*)G)->begin(), DerefFun(getSecond));
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}
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static nodes_iterator nodes_end(MSchedGraph *G) {
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return map_iterator(((MSchedGraph*)G)->end(), DerefFun(getSecond));
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}
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};
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template <> struct GraphTraits<Inverse<MSchedGraph*> > {
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typedef MSchedGraphNode NodeType;
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typedef MSchedGraphNode::pred_iterator ChildIteratorType;
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->pred_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->pred_end();
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}
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typedef std::pointer_to_unary_function<std::pair<const MachineInstr* const,
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MSchedGraphNode*>&, MSchedGraphNode&> DerefFun;
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typedef mapped_iterator<MSchedGraph::iterator, DerefFun> nodes_iterator;
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static nodes_iterator nodes_begin(MSchedGraph *G) {
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return map_iterator(((MSchedGraph*)G)->begin(), DerefFun(getSecond));
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}
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static nodes_iterator nodes_end(MSchedGraph *G) {
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return map_iterator(((MSchedGraph*)G)->end(), DerefFun(getSecond));
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}
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};
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template <> struct GraphTraits<Inverse<const MSchedGraph*> > {
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typedef const MSchedGraphNode NodeType;
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typedef MSchedGraphNode::pred_const_iterator ChildIteratorType;
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static inline ChildIteratorType child_begin(NodeType *N) {
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return N->pred_begin();
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}
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static inline ChildIteratorType child_end(NodeType *N) {
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return N->pred_end();
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}
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typedef std::pointer_to_unary_function<std::pair<const MachineInstr* const,
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MSchedGraphNode*>&, MSchedGraphNode&> DerefFun;
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typedef mapped_iterator<MSchedGraph::iterator, DerefFun> nodes_iterator;
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static nodes_iterator nodes_begin(MSchedGraph *G) {
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return map_iterator(((MSchedGraph*)G)->begin(), DerefFun(getSecond));
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}
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static nodes_iterator nodes_end(MSchedGraph *G) {
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return map_iterator(((MSchedGraph*)G)->end(), DerefFun(getSecond));
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}
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};
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}
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#endif
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