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Scheduling DAG for instruction scheduling. Currently for a single basic block.
llvm-svn: 394
This commit is contained in:
Vikram S. Adve
parent
8fdc52a63d
commit
23be1e0839
500
include/llvm/CodeGen/SchedGraph.h
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500
include/llvm/CodeGen/SchedGraph.h
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/* -*-C++-*-
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****************************************************************************
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* File:
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* SchedGraph.h
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*
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* Purpose:
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* Scheduling graph based on SSA graph plus extra dependence edges
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* capturing dependences due to machine resources (machine registers,
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* CC registers, and any others).
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*
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* Strategy:
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* This graph tries to leverage the SSA graph as much as possible,
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* but captures the extra dependences through a common interface.
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*
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* History:
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* 7/20/01 - Vikram Adve - Created
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***************************************************************************/
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#ifndef LLVM_CODEGEN_SCHEDGRAPH_H
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#define LLVM_CODEGEN_SCHEDGRAPH_H
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//************************** System Include Files **************************/
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#include <hash_map>
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#include <vector>
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//*************************** User Include Files ***************************/
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#include "llvm/CFGdecls.h" // just for graph iterators
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#include "llvm/Support/NonCopyable.h"
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#include "llvm/Support/HashExtras.h"
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#include "llvm/Support/StringExtras.h"
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#include "llvm/CodeGen/TargetMachine.h"
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#include "llvm/CodeGen/MachineInstr.h"
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//************************* Opaque Declarations ****************************/
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class Value;
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class Instruction;
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class BasicBlock;
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class Method;
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class MachineInstr;
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class TargetMachine;
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class SchedGraphEdge;
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class SchedGraphNode;
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class SchedGraph;
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class NodeToRegRefMap;
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/******************** Exported Data Types and Constants ********************/
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typedef int ResourceId;
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const ResourceId InvalidResourceId = -1;
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//*********************** Public Class Declarations ************************/
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class SchedGraphEdge: public NonCopyable {
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public:
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enum SchedGraphEdgeDepType {
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CtrlDep, MemoryDep, DefUseDep, MachineRegister, MachineResource
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};
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enum DataDepOrderType {
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TrueDep, AntiDep, OutputDep, NonDataDep
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};
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protected:
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SchedGraphNode* src;
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SchedGraphNode* sink;
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SchedGraphEdgeDepType depType;
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DataDepOrderType depOrderType;
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int minDelay; // cached latency (assumes fixed target arch)
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union {
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Value* val;
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int machineRegNum;
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ResourceId resourceId;
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};
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public:
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// For all constructors, if minDelay is unspecified, minDelay is
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// set to _src->getLatency().
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// constructor for CtrlDep or MemoryDep edges, selected by 3rd argument
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/*ctor*/ SchedGraphEdge(SchedGraphNode* _src,
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SchedGraphNode* _sink,
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SchedGraphEdgeDepType _depType,
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DataDepOrderType _depOrderType =TrueDep,
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int _minDelay = -1);
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// constructor for explicit def-use or memory def-use edge
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/*ctor*/ SchedGraphEdge(SchedGraphNode* _src,
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SchedGraphNode* _sink,
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Value* _val,
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DataDepOrderType _depOrderType =TrueDep,
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int _minDelay = -1);
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// constructor for machine register dependence
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/*ctor*/ SchedGraphEdge(SchedGraphNode* _src,
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SchedGraphNode* _sink,
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unsigned int _regNum,
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DataDepOrderType _depOrderType =TrueDep,
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int _minDelay = -1);
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// constructor for any other machine resource dependences.
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// DataDepOrderType is always NonDataDep. It it not an argument to
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// avoid overloading ambiguity with previous constructor.
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/*ctor*/ SchedGraphEdge(SchedGraphNode* _src,
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SchedGraphNode* _sink,
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ResourceId _resourceId,
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int _minDelay = -1);
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/*dtor*/ ~SchedGraphEdge() {}
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SchedGraphNode* getSrc () const { return src; }
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SchedGraphNode* getSink () const { return sink; }
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int getMinDelay () const { return minDelay; }
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SchedGraphEdgeDepType getDepType () const { return depType; }
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const Value* getValue () const {
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assert(depType == DefUseDep || depType == MemoryDep); return val;
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}
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int getMachineReg () const {
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assert(depType == MachineRegister); return machineRegNum;
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}
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int getResourceId () const {
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assert(depType == MachineResource); return resourceId;
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}
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public:
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//
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// Debugging support
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//
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friend ostream& operator<<(ostream& os, const SchedGraphEdge& edge);
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void dump (int indent=0) const { printIndent(indent);
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cout << *this; }
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private:
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// disable default ctor
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/*ctor*/ SchedGraphEdge(); // DO NOT IMPLEMENT
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};
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class SchedGraphNode: public NonCopyable {
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private:
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unsigned int nodeId;
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const Instruction* instr;
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const MachineInstr* minstr;
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vector<SchedGraphEdge*> inEdges;
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vector<SchedGraphEdge*> outEdges;
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int latency;
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public:
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typedef vector<SchedGraphEdge*>::iterator iterator;
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typedef vector<SchedGraphEdge*>::const_iterator const_iterator;
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public:
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//
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// Accessor methods
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//
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unsigned int getNodeId () const { return nodeId; }
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const Instruction* getInstr () const { return instr; }
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const MachineInstr* getMachineInstr () const { return minstr; }
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MachineOpCode getOpCode () const { return minstr->getOpCode();}
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int getLatency () const { return latency; }
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unsigned int getNumInEdges () const { return inEdges.size(); }
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unsigned int getNumOutEdges () const { return outEdges.size(); }
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bool isDummyNode () const { return (minstr == NULL); }
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//
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// Iterators
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//
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iterator beginInEdges () { return inEdges.begin(); }
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iterator endInEdges () { return inEdges.end(); }
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iterator beginOutEdges () { return outEdges.begin(); }
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iterator endOutEdges () { return outEdges.end(); }
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const_iterator beginInEdges () const { return inEdges.begin(); }
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const_iterator endInEdges () const { return inEdges.end(); }
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const_iterator beginOutEdges () const { return outEdges.begin(); }
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const_iterator endOutEdges () const { return outEdges.end(); }
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//
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// Limited modifier methods
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//
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void eraseAllEdges ();
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public:
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//
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// Debugging support
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//
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friend ostream& operator<<(ostream& os, const SchedGraphNode& node);
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void dump (int indent=0) const { printIndent(indent);
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cout << *this; }
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private:
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friend class SchedGraph; // give access for ctor and dtor
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friend class SchedGraphEdge; // give access for adding edges
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void addInEdge (SchedGraphEdge* edge);
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void addOutEdge (SchedGraphEdge* edge);
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void removeInEdge (const SchedGraphEdge* edge);
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void removeOutEdge (const SchedGraphEdge* edge);
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// disable default constructor and provide a ctor for single-block graphs
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/*ctor*/ SchedGraphNode(); // DO NOT IMPLEMENT
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/*ctor*/ SchedGraphNode (unsigned int _nodeId,
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const Instruction* _instr,
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const MachineInstr* _minstr,
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const TargetMachine& _target);
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/*dtor*/ ~SchedGraphNode ();
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};
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class SchedGraph :
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public NonCopyable,
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private hash_map<const MachineInstr*, SchedGraphNode*>
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{
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private:
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vector<const BasicBlock*> bbVec; // basic blocks included in the graph
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SchedGraphNode* graphRoot; // the root and leaf are not inserted
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SchedGraphNode* graphLeaf; // in the hash_map (see getNumNodes())
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public:
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typedef hash_map<const MachineInstr*, SchedGraphNode*>::iterator iterator;
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typedef hash_map<const MachineInstr*, SchedGraphNode*>::const_iterator const_iterator;
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public:
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//
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// Accessor methods
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//
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const vector<const BasicBlock*>& getBasicBlocks() const { return bbVec; }
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const unsigned int getNumNodes() const { return size()+2; }
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SchedGraphNode* getRoot() const { return graphRoot; }
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SchedGraphNode* getLeaf() const { return graphLeaf; }
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SchedGraphNode* getGraphNodeForInstr(const MachineInstr* minstr) const {
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const_iterator onePair = this->find(minstr);
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return (onePair != this->end())? (*onePair).second : NULL;
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}
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//
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// Delete a node from the graph.
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//
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void eraseNode(SchedGraphNode* node);
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//
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// Unordered iterators.
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// Return values is pair<const MachineIntr*,SchedGraphNode*>.
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//
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iterator begin() {
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return hash_map<const MachineInstr*, SchedGraphNode*>::begin();
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}
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iterator end() {
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return hash_map<const MachineInstr*, SchedGraphNode*>::end();
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}
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const_iterator begin() const {
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return hash_map<const MachineInstr*, SchedGraphNode*>::begin();
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}
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const_iterator end() const {
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return hash_map<const MachineInstr*, SchedGraphNode*>::end();
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}
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//
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// Ordered iterators.
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// Return values is pair<const MachineIntr*,SchedGraphNode*>.
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//
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// void postord_init();
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// postorder_iterator postord_begin();
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// postorder_iterator postord_end();
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// const_postorder_iterator postord_begin() const;
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// const_postorder_iterator postord_end() const;
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//
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// Debugging support
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//
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void dump () const;
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private:
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friend class SchedGraphSet; // give access to ctor
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// disable default constructor and provide a ctor for single-block graphs
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/*ctor*/ SchedGraph (); // DO NOT IMPLEMENT
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/*ctor*/ SchedGraph (const BasicBlock* bb,
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const TargetMachine& target);
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/*dtor*/ ~SchedGraph ();
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inline void noteGraphNodeForInstr (const MachineInstr* minstr,
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SchedGraphNode* node)
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{
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assert((*this)[minstr] == NULL);
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(*this)[minstr] = node;
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}
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//
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// Graph builder
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//
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void buildGraph (const TargetMachine& target);
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void addEdgesForInstruction (SchedGraphNode* node,
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NodeToRegRefMap& regToRefVecMap,
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const TargetMachine& target);
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void addCDEdges (const TerminatorInst* term,
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const TargetMachine& target);
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void addMemEdges (const vector<const Instruction*>& memVec,
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const TargetMachine& target);
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void addMachineRegEdges (NodeToRegRefMap& regToRefVecMap,
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const TargetMachine& target);
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void addSSAEdge (SchedGraphNode* node,
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Value* val,
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const TargetMachine& target);
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void addDummyEdges ();
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};
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class SchedGraphSet :
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public NonCopyable,
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private hash_map<const BasicBlock*, SchedGraph*>
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{
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private:
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const Method* method;
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public:
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typedef hash_map<const BasicBlock*, SchedGraph*>::iterator iterator;
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typedef hash_map<const BasicBlock*, SchedGraph*>::const_iterator const_iterator;
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public:
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/*ctor*/ SchedGraphSet (const Method* _method,
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const TargetMachine& target);
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/*dtor*/ ~SchedGraphSet ();
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//
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// Accessors
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//
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SchedGraph* getGraphForBasicBlock (const BasicBlock* bb) const {
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const_iterator onePair = this->find(bb);
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return (onePair != this->end())? (*onePair).second : NULL;
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}
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//
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// Iterators
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//
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iterator begin() {
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return hash_map<const BasicBlock*, SchedGraph*>::begin();
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}
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iterator end() {
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return hash_map<const BasicBlock*, SchedGraph*>::end();
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}
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const_iterator begin() const {
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return hash_map<const BasicBlock*, SchedGraph*>::begin();
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}
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const_iterator end() const {
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return hash_map<const BasicBlock*, SchedGraph*>::end();
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}
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//
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// Debugging support
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//
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void dump () const;
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private:
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inline void noteGraphForBlock(const BasicBlock* bb, SchedGraph* graph) {
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assert((*this)[bb] == NULL);
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(*this)[bb] = graph;
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}
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//
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// Graph builder
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//
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void buildGraphsForMethod (const Method *method,
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const TargetMachine& target);
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};
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//********************** Sched Graph Iterators *****************************/
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// Ok to make it a template because it shd get instantiated at most twice:
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// for <SchedGraphNode, SchedGraphNode::iterator> and
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// for <const SchedGraphNode, SchedGraphNode::const_iterator>.
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//
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template <class _NodeType, class _EdgeType, class _EdgeIter>
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class InOutIterator: public std::bidirectional_iterator<_NodeType, ptrdiff_t> {
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protected:
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_EdgeIter oi;
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public:
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typedef InOutIterator<_NodeType, _EdgeType, _EdgeIter> _Self;
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inline InOutIterator(_EdgeIter startEdge) : oi(startEdge) {}
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inline bool operator==(const _Self& x) const { return oi == x.oi; }
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inline bool operator!=(const _Self& x) const { return !operator==(x); }
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// operator*() differs for pred or succ iterator
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virtual inline _NodeType* operator*() const = 0;
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inline _NodeType* operator->() const { return operator*(); }
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inline _EdgeType* getEdge() const { return *(oi); }
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inline _Self& operator++() { ++oi; return *this; } // Preincrement
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// inline _Self operator++(int) { // Postincrement
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// _Self tmp(*this); ++*this; return tmp;
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// }
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inline _Self& operator--() { --oi; return *this; } // Predecrement
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// inline _Self operator--(int) { // Postdecrement
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// _Self tmp = *this; --*this; return tmp;
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// }
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};
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template <class _NodeType, class _EdgeType, class _EdgeIter>
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class PredIterator: public InOutIterator<_NodeType, _EdgeType, _EdgeIter> {
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public:
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inline PredIterator(_EdgeIter startEdge)
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: InOutIterator<_NodeType, _EdgeType, _EdgeIter>(startEdge) {}
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virtual inline _NodeType* operator*() const { return (*oi)->getSrc(); }
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};
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template <class _NodeType, class _EdgeType, class _EdgeIter>
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class SuccIterator: public InOutIterator<_NodeType, _EdgeType, _EdgeIter> {
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public:
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inline SuccIterator(_EdgeIter startEdge)
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: InOutIterator<_NodeType, _EdgeType, _EdgeIter>(startEdge) {}
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virtual inline _NodeType* operator*() const { return (*oi)->getSink(); }
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};
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//
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// sg_pred_iterator
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// sg_pred_const_iterator
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//
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typedef PredIterator<SchedGraphNode, SchedGraphEdge, SchedGraphNode::iterator>
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sg_pred_iterator;
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typedef PredIterator<const SchedGraphNode, const SchedGraphEdge,SchedGraphNode::const_iterator>
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sg_pred_const_iterator;
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inline sg_pred_iterator pred_begin( SchedGraphNode *N) {
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return sg_pred_iterator(N->beginInEdges());
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}
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inline sg_pred_iterator pred_end( SchedGraphNode *N) {
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return sg_pred_iterator(N->endInEdges());
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}
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inline sg_pred_const_iterator pred_begin(const SchedGraphNode *N) {
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return sg_pred_const_iterator(N->beginInEdges());
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}
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inline sg_pred_const_iterator pred_end( const SchedGraphNode *N) {
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return sg_pred_const_iterator(N->endInEdges());
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}
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//
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// sg_succ_iterator
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// sg_succ_const_iterator
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//
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typedef SuccIterator<SchedGraphNode, SchedGraphEdge, SchedGraphNode::iterator>
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sg_succ_iterator;
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typedef SuccIterator<const SchedGraphNode, const SchedGraphEdge,SchedGraphNode::const_iterator>
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sg_succ_const_iterator;
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inline sg_succ_iterator succ_begin( SchedGraphNode *N) {
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return sg_succ_iterator(N->beginOutEdges());
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}
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inline sg_succ_iterator succ_end( SchedGraphNode *N) {
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return sg_succ_iterator(N->endOutEdges());
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}
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inline sg_succ_const_iterator succ_begin(const SchedGraphNode *N) {
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return sg_succ_const_iterator(N->beginOutEdges());
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}
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inline sg_succ_const_iterator succ_end( const SchedGraphNode *N) {
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return sg_succ_const_iterator(N->endOutEdges());
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}
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//
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// po_iterator
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// po_const_iterator
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//
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typedef cfg::POIterator<SchedGraphNode, sg_succ_iterator> sg_po_iterator;
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typedef cfg::POIterator<const SchedGraphNode,
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sg_succ_const_iterator> sg_po_const_iterator;
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//************************ External Functions *****************************/
|
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ostream& operator<<(ostream& os, const SchedGraphEdge& edge);
|
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ostream& operator<<(ostream& os, const SchedGraphNode& node);
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/***************************************************************************/
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#endif
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759
lib/CodeGen/InstrSched/SchedGraph.cpp
Normal file
759
lib/CodeGen/InstrSched/SchedGraph.cpp
Normal file
@ -0,0 +1,759 @@
|
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/*
|
||||
****************************************************************************
|
||||
* File:
|
||||
* SchedGraph.cpp
|
||||
*
|
||||
* Purpose:
|
||||
* Scheduling graph based on SSA graph plus extra dependence edges
|
||||
* capturing dependences due to machine resources (machine registers,
|
||||
* CC registers, and any others).
|
||||
*
|
||||
* History:
|
||||
* 7/20/01 - Vikram Adve - Created
|
||||
***************************************************************************/
|
||||
|
||||
//************************** System Include Files **************************/
|
||||
|
||||
#include <algorithm>
|
||||
|
||||
//*************************** User Include Files ***************************/
|
||||
|
||||
#include "llvm/InstrTypes.h"
|
||||
#include "llvm/Instruction.h"
|
||||
#include "llvm/BasicBlock.h"
|
||||
#include "llvm/Method.h"
|
||||
#include "llvm/CodeGen/SchedGraph.h"
|
||||
#include "llvm/CodeGen/MachineInstr.h"
|
||||
#include "llvm/CodeGen/TargetMachine.h"
|
||||
|
||||
//************************* Class Implementations **************************/
|
||||
|
||||
//
|
||||
// class SchedGraphEdge
|
||||
//
|
||||
|
||||
/*ctor*/
|
||||
SchedGraphEdge::SchedGraphEdge(SchedGraphNode* _src,
|
||||
SchedGraphNode* _sink,
|
||||
SchedGraphEdgeDepType _depType,
|
||||
DataDepOrderType _depOrderType,
|
||||
int _minDelay)
|
||||
: src(_src),
|
||||
sink(_sink),
|
||||
depType(_depType),
|
||||
depOrderType(_depOrderType),
|
||||
val(NULL),
|
||||
minDelay((_minDelay >= 0)? _minDelay : _src->getLatency())
|
||||
{
|
||||
src->addOutEdge(this);
|
||||
sink->addInEdge(this);
|
||||
}
|
||||
|
||||
|
||||
/*ctor*/
|
||||
SchedGraphEdge::SchedGraphEdge(SchedGraphNode* _src,
|
||||
SchedGraphNode* _sink,
|
||||
Value* _val,
|
||||
DataDepOrderType _depOrderType,
|
||||
int _minDelay)
|
||||
: src(_src),
|
||||
sink(_sink),
|
||||
depType(DefUseDep),
|
||||
depOrderType(_depOrderType),
|
||||
val(_val),
|
||||
minDelay((_minDelay >= 0)? _minDelay : _src->getLatency())
|
||||
{
|
||||
src->addOutEdge(this);
|
||||
sink->addInEdge(this);
|
||||
}
|
||||
|
||||
|
||||
/*ctor*/
|
||||
SchedGraphEdge::SchedGraphEdge(SchedGraphNode* _src,
|
||||
SchedGraphNode* _sink,
|
||||
unsigned int _regNum,
|
||||
DataDepOrderType _depOrderType,
|
||||
int _minDelay)
|
||||
: src(_src),
|
||||
sink(_sink),
|
||||
depType(MachineRegister),
|
||||
depOrderType(_depOrderType),
|
||||
minDelay((_minDelay >= 0)? _minDelay : _src->getLatency()),
|
||||
machineRegNum(_regNum)
|
||||
{
|
||||
src->addOutEdge(this);
|
||||
sink->addInEdge(this);
|
||||
}
|
||||
|
||||
|
||||
/*ctor*/
|
||||
SchedGraphEdge::SchedGraphEdge(SchedGraphNode* _src,
|
||||
SchedGraphNode* _sink,
|
||||
ResourceId _resourceId,
|
||||
int _minDelay)
|
||||
: src(_src),
|
||||
sink(_sink),
|
||||
depType(MachineResource),
|
||||
depOrderType(NonDataDep),
|
||||
minDelay((_minDelay >= 0)? _minDelay : _src->getLatency()),
|
||||
resourceId(_resourceId)
|
||||
{
|
||||
src->addOutEdge(this);
|
||||
sink->addInEdge(this);
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// class SchedGraphNode
|
||||
//
|
||||
|
||||
/*ctor*/
|
||||
SchedGraphNode::SchedGraphNode(unsigned int _nodeId,
|
||||
const Instruction* _instr,
|
||||
const MachineInstr* _minstr,
|
||||
const TargetMachine& target)
|
||||
: nodeId(_nodeId),
|
||||
instr(_instr),
|
||||
minstr(_minstr),
|
||||
latency(0)
|
||||
{
|
||||
if (minstr)
|
||||
{
|
||||
MachineOpCode mopCode = minstr->getOpCode();
|
||||
latency = target.getInstrInfo().hasResultInterlock(mopCode)
|
||||
? target.getInstrInfo().minLatency(mopCode)
|
||||
: target.getInstrInfo().maxLatency(mopCode);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
/*dtor*/
|
||||
SchedGraphNode::~SchedGraphNode()
|
||||
{
|
||||
// a node deletes its outgoing edges only
|
||||
for (unsigned i=0, N=outEdges.size(); i < N; i++)
|
||||
delete outEdges[i];
|
||||
}
|
||||
|
||||
|
||||
inline void
|
||||
SchedGraphNode::addInEdge(SchedGraphEdge* edge)
|
||||
{
|
||||
inEdges.push_back(edge);
|
||||
}
|
||||
|
||||
|
||||
inline void
|
||||
SchedGraphNode::addOutEdge(SchedGraphEdge* edge)
|
||||
{
|
||||
outEdges.push_back(edge);
|
||||
}
|
||||
|
||||
inline void
|
||||
SchedGraphNode::removeInEdge(const SchedGraphEdge* edge)
|
||||
{
|
||||
assert(edge->getSink() == this);
|
||||
for (iterator I = beginInEdges(); I != endInEdges(); ++I)
|
||||
if ((*I) == edge)
|
||||
{
|
||||
inEdges.erase(I);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
inline void
|
||||
SchedGraphNode::removeOutEdge(const SchedGraphEdge* edge)
|
||||
{
|
||||
assert(edge->getSrc() == this);
|
||||
for (iterator I = beginOutEdges(); I != endOutEdges(); ++I)
|
||||
if ((*I) == edge)
|
||||
{
|
||||
outEdges.erase(I);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
SchedGraphNode::eraseAllEdges()
|
||||
{
|
||||
// Disconnect and delete all in-edges and out-edges for the node.
|
||||
// Note that we delete the in-edges too since they have been
|
||||
// disconnected from the source node and will not be deleted there.
|
||||
for (iterator I = beginInEdges(); I != endInEdges(); ++I)
|
||||
{
|
||||
(*I)->getSrc()->removeOutEdge(*I);
|
||||
delete *I;
|
||||
}
|
||||
for (iterator I = beginOutEdges(); I != endOutEdges(); ++I)
|
||||
{
|
||||
(*I)->getSink()->removeInEdge(*I);
|
||||
delete *I;
|
||||
}
|
||||
inEdges.clear();
|
||||
outEdges.clear();
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// class SchedGraph
|
||||
//
|
||||
|
||||
|
||||
/*ctor*/
|
||||
SchedGraph::SchedGraph(const BasicBlock* bb,
|
||||
const TargetMachine& target)
|
||||
{
|
||||
bbVec.push_back(bb);
|
||||
this->buildGraph(target);
|
||||
}
|
||||
|
||||
|
||||
/*dtor*/
|
||||
SchedGraph::~SchedGraph()
|
||||
{
|
||||
// delete all the nodes. each node deletes its out-edges.
|
||||
for (iterator I=begin(); I != end(); ++I)
|
||||
delete (*I).second;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraph::dump() const
|
||||
{
|
||||
cout << " Sched Graph for Basic Blocks: ";
|
||||
for (unsigned i=0, N=bbVec.size(); i < N; i++)
|
||||
{
|
||||
cout << (bbVec[i]->hasName()? bbVec[i]->getName() : "block")
|
||||
<< " (" << bbVec[i] << ")"
|
||||
<< ((i == N-1)? "" : ", ");
|
||||
}
|
||||
|
||||
cout << endl << endl << " Actual Root nodes : ";
|
||||
for (unsigned i=0, N=graphRoot->outEdges.size(); i < N; i++)
|
||||
cout << graphRoot->outEdges[i]->getSink()->getNodeId()
|
||||
<< ((i == N-1)? "" : ", ");
|
||||
|
||||
cout << endl << " Graph Nodes:" << endl;
|
||||
for (const_iterator I=begin(); I != end(); ++I)
|
||||
cout << endl << * (*I).second;
|
||||
|
||||
cout << endl;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraph::addDummyEdges()
|
||||
{
|
||||
assert(graphRoot->outEdges.size() == 0);
|
||||
|
||||
for (const_iterator I=begin(); I != end(); ++I)
|
||||
{
|
||||
SchedGraphNode* node = (*I).second;
|
||||
assert(node != graphRoot && node != graphLeaf);
|
||||
if (node->beginInEdges() == node->endInEdges())
|
||||
(void) new SchedGraphEdge(graphRoot, node, SchedGraphEdge::CtrlDep,
|
||||
SchedGraphEdge::NonDataDep, 0);
|
||||
if (node->beginOutEdges() == node->endOutEdges())
|
||||
(void) new SchedGraphEdge(node, graphLeaf, SchedGraphEdge::CtrlDep,
|
||||
SchedGraphEdge::NonDataDep, 0);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraph::addCDEdges(const TerminatorInst* term,
|
||||
const TargetMachine& target)
|
||||
{
|
||||
const MachineInstrInfo& mii = target.getInstrInfo();
|
||||
MachineCodeForVMInstr& termMvec = term->getMachineInstrVec();
|
||||
|
||||
// Find the first branch instr in the sequence of machine instrs for term
|
||||
//
|
||||
unsigned first = 0;
|
||||
while (! mii.isBranch(termMvec[first]->getOpCode()))
|
||||
++first;
|
||||
assert(first < termMvec.size() &&
|
||||
"No branch instructions for BR? Ok, but weird! Delete assertion.");
|
||||
if (first == termMvec.size())
|
||||
return;
|
||||
|
||||
SchedGraphNode* firstBrNode = this->getGraphNodeForInstr(termMvec[first]);
|
||||
|
||||
// Add CD edges from each instruction in the sequence to the
|
||||
// *last preceding* branch instr. in the sequence
|
||||
//
|
||||
for (int i = (int) termMvec.size()-1; i > (int) first; i--)
|
||||
{
|
||||
SchedGraphNode* toNode = this->getGraphNodeForInstr(termMvec[i]);
|
||||
assert(toNode && "No node for instr generated for branch?");
|
||||
|
||||
for (int j = i-1; j >= 0; j--)
|
||||
if (mii.isBranch(termMvec[j]->getOpCode()))
|
||||
{
|
||||
SchedGraphNode* brNode = this->getGraphNodeForInstr(termMvec[j]);
|
||||
assert(brNode && "No node for instr generated for branch?");
|
||||
(void) new SchedGraphEdge(brNode, toNode, SchedGraphEdge::CtrlDep,
|
||||
SchedGraphEdge::NonDataDep, 0);
|
||||
break; // only one incoming edge is enough
|
||||
}
|
||||
}
|
||||
|
||||
// Add CD edges from each instruction preceding the first branch
|
||||
// to the first branch
|
||||
//
|
||||
for (int i = first-1; i >= 0; i--)
|
||||
{
|
||||
SchedGraphNode* fromNode = this->getGraphNodeForInstr(termMvec[i]);
|
||||
assert(fromNode && "No node for instr generated for branch?");
|
||||
(void) new SchedGraphEdge(fromNode, firstBrNode, SchedGraphEdge::CtrlDep,
|
||||
SchedGraphEdge::NonDataDep, 0);
|
||||
}
|
||||
|
||||
// Now add CD edges to the first branch instruction in the sequence
|
||||
// from all preceding instructions in the basic block.
|
||||
//
|
||||
const BasicBlock* bb = term->getParent();
|
||||
for (BasicBlock::const_iterator II = bb->begin(); II != bb->end(); ++II)
|
||||
{
|
||||
if ((*II) == (const Instruction*) term) // special case, handled above
|
||||
continue;
|
||||
|
||||
assert(! (*II)->isTerminator() && "Two terminators in basic block?");
|
||||
|
||||
const MachineCodeForVMInstr& mvec = (*II)->getMachineInstrVec();
|
||||
for (unsigned i=0, N=mvec.size(); i < N; i++)
|
||||
{
|
||||
SchedGraphNode* fromNode = this->getGraphNodeForInstr(mvec[i]);
|
||||
if (fromNode == NULL)
|
||||
continue; // dummy instruction, e.g., PHI
|
||||
|
||||
(void) new SchedGraphEdge(fromNode, firstBrNode,
|
||||
SchedGraphEdge::CtrlDep,
|
||||
SchedGraphEdge::NonDataDep, 0);
|
||||
|
||||
// If we find any other machine instructions (other than due to
|
||||
// the terminator) that also have delay slots, add an outgoing edge
|
||||
// from the instruction to the instructions in the delay slots.
|
||||
//
|
||||
unsigned d = mii.getNumDelaySlots(mvec[i]->getOpCode());
|
||||
assert(i+d < N && "Insufficient delay slots for instruction?");
|
||||
|
||||
for (unsigned j=1; j <= d; j++)
|
||||
{
|
||||
SchedGraphNode* toNode = this->getGraphNodeForInstr(mvec[i+j]);
|
||||
assert(toNode && "No node for machine instr in delay slot?");
|
||||
(void) new SchedGraphEdge(fromNode, toNode,
|
||||
SchedGraphEdge::CtrlDep,
|
||||
SchedGraphEdge::NonDataDep, 0);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraph::addMemEdges(const vector<const Instruction*>& memVec,
|
||||
const TargetMachine& target)
|
||||
{
|
||||
const MachineInstrInfo& mii = target.getInstrInfo();
|
||||
|
||||
for (unsigned im=0, NM=memVec.size(); im < NM; im++)
|
||||
{
|
||||
const Instruction* fromInstr = memVec[im];
|
||||
bool fromIsLoad = fromInstr->getOpcode() == Instruction::Load;
|
||||
|
||||
for (unsigned jm=im+1; jm < NM; jm++)
|
||||
{
|
||||
const Instruction* toInstr = memVec[jm];
|
||||
bool toIsLoad = toInstr->getOpcode() == Instruction::Load;
|
||||
SchedGraphEdge::DataDepOrderType depOrderType;
|
||||
|
||||
if (fromIsLoad)
|
||||
{
|
||||
if (toIsLoad) continue; // both instructions are loads
|
||||
depOrderType = SchedGraphEdge::AntiDep;
|
||||
}
|
||||
else
|
||||
{
|
||||
depOrderType = (toIsLoad)? SchedGraphEdge::TrueDep
|
||||
: SchedGraphEdge::OutputDep;
|
||||
}
|
||||
|
||||
MachineCodeForVMInstr& fromInstrMvec=fromInstr->getMachineInstrVec();
|
||||
MachineCodeForVMInstr& toInstrMvec = toInstr->getMachineInstrVec();
|
||||
|
||||
// We have two VM memory instructions, and at least one is a store.
|
||||
// Add edges between all machine load/store instructions.
|
||||
//
|
||||
for (unsigned i=0, N=fromInstrMvec.size(); i < N; i++)
|
||||
{
|
||||
MachineOpCode fromOpCode = fromInstrMvec[i]->getOpCode();
|
||||
if (mii.isLoad(fromOpCode) || mii.isStore(fromOpCode))
|
||||
{
|
||||
SchedGraphNode* fromNode =
|
||||
this->getGraphNodeForInstr(fromInstrMvec[i]);
|
||||
assert(fromNode && "No node for memory instr?");
|
||||
|
||||
for (unsigned j=0, M=toInstrMvec.size(); j < M; j++)
|
||||
{
|
||||
MachineOpCode toOpCode = toInstrMvec[j]->getOpCode();
|
||||
if (mii.isLoad(toOpCode) || mii.isStore(toOpCode))
|
||||
{
|
||||
SchedGraphNode* toNode =
|
||||
this->getGraphNodeForInstr(toInstrMvec[j]);
|
||||
assert(toNode && "No node for memory instr?");
|
||||
|
||||
(void) new SchedGraphEdge(fromNode, toNode,
|
||||
SchedGraphEdge::MemoryDep,
|
||||
depOrderType, 1);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
typedef vector< pair<SchedGraphNode*, unsigned int> > RegRefVec;
|
||||
|
||||
// The following needs to be a class, not a typedef, so we can use
|
||||
// an opaque declaration in SchedGraph.h
|
||||
class NodeToRegRefMap: public hash_map<int, RegRefVec> {
|
||||
typedef hash_map<int, RegRefVec>:: iterator iterator;
|
||||
typedef hash_map<int, RegRefVec>::const_iterator const_iterator;
|
||||
};
|
||||
|
||||
|
||||
void
|
||||
SchedGraph::addMachineRegEdges(NodeToRegRefMap& regToRefVecMap,
|
||||
const TargetMachine& target)
|
||||
{
|
||||
assert(bbVec.size() == 1 && "Only handling a single basic block here");
|
||||
|
||||
// This assumes that such hardwired registers are never allocated
|
||||
// to any LLVM value (since register allocation happens later), i.e.,
|
||||
// any uses or defs of this register have been made explicit!
|
||||
// Also assumes that two registers with different numbers are
|
||||
// not aliased!
|
||||
//
|
||||
for (NodeToRegRefMap::iterator I = regToRefVecMap.begin();
|
||||
I != regToRefVecMap.end(); ++I)
|
||||
{
|
||||
int regNum = (*I).first;
|
||||
RegRefVec& regRefVec = (*I).second;
|
||||
|
||||
// regRefVec is ordered by control flow order in the basic block
|
||||
int lastDefIdx = -1;
|
||||
for (unsigned i=0; i < regRefVec.size(); ++i)
|
||||
{
|
||||
SchedGraphNode* node = regRefVec[i].first;
|
||||
bool isDef = regRefVec[i].second;
|
||||
|
||||
if (isDef)
|
||||
{ // Each def gets an output edge from the last def
|
||||
if (lastDefIdx > 0)
|
||||
new SchedGraphEdge(regRefVec[lastDefIdx].first, node, regNum,
|
||||
SchedGraphEdge::OutputDep);
|
||||
|
||||
// Also, an anti edge from all uses *since* the last def,
|
||||
// But don't add edge from an instruction to itself!
|
||||
for (int u = 1 + lastDefIdx; u < (int) i; u++)
|
||||
if (regRefVec[u].first != node)
|
||||
new SchedGraphEdge(regRefVec[u].first, node, regNum,
|
||||
SchedGraphEdge::AntiDep);
|
||||
}
|
||||
else
|
||||
{ // Each use gets a true edge from the last def
|
||||
if (lastDefIdx > 0)
|
||||
new SchedGraphEdge(regRefVec[lastDefIdx].first, node, regNum);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraph::addSSAEdge(SchedGraphNode* node,
|
||||
Value* val,
|
||||
const TargetMachine& target)
|
||||
{
|
||||
if (val->getValueType() != Value::InstructionVal)
|
||||
return;
|
||||
|
||||
const Instruction* thisVMInstr = node->getInstr();
|
||||
const Instruction* defVMInstr = (const Instruction*) val;
|
||||
|
||||
// Phi instructions are the only ones that produce a value but don't get
|
||||
// any non-dummy machine instructions. Return here as an optimization.
|
||||
//
|
||||
if (defVMInstr->isPHINode())
|
||||
return;
|
||||
|
||||
// Now add the graph edge for the appropriate machine instruction(s).
|
||||
// Note that multiple machine instructions generated for the
|
||||
// def VM instruction may modify the register for the def value.
|
||||
//
|
||||
MachineCodeForVMInstr& defMvec = defVMInstr->getMachineInstrVec();
|
||||
const MachineInstrInfo& mii = target.getInstrInfo();
|
||||
|
||||
for (unsigned i=0, N=defMvec.size(); i < N; i++)
|
||||
for (int o=0, N = mii.getNumOperands(defMvec[i]->getOpCode()); o < N; o++)
|
||||
{
|
||||
const MachineOperand& defOp = defMvec[i]->getOperand(o);
|
||||
|
||||
if (defOp.opIsDef()
|
||||
&& (defOp.getOperandType() == MachineOperand::MO_VirtualRegister
|
||||
|| defOp.getOperandType() == MachineOperand::MO_CCRegister)
|
||||
&& (defOp.getVRegValue() == val))
|
||||
{
|
||||
// this instruction does define value `val'.
|
||||
// if there is a node for it in the same graph, add an edge.
|
||||
SchedGraphNode* defNode = this->getGraphNodeForInstr(defMvec[i]);
|
||||
if (defNode != NULL)
|
||||
(void) new SchedGraphEdge(defNode, node, val);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraph::addEdgesForInstruction(SchedGraphNode* node,
|
||||
NodeToRegRefMap& regToRefVecMap,
|
||||
const TargetMachine& target)
|
||||
{
|
||||
const Instruction& instr = * node->getInstr(); // No dummy nodes here!
|
||||
const MachineInstr& minstr = * node->getMachineInstr();
|
||||
|
||||
// Add incoming edges for the following:
|
||||
// (1) operands of the machine instruction, including hidden operands
|
||||
// (2) machine register dependences
|
||||
// (3) other resource dependences for the machine instruction, if any
|
||||
// Also, note any uses or defs of machine registers.
|
||||
//
|
||||
for (unsigned i=0, numOps=minstr.getNumOperands(); i < numOps; i++)
|
||||
{
|
||||
const MachineOperand& mop = minstr.getOperand(i);
|
||||
|
||||
// if this writes to a machine register other than the hardwired
|
||||
// "zero" register used on many processors, record the reference.
|
||||
if (mop.getOperandType() == MachineOperand::MO_MachineRegister
|
||||
&& (! (target.zeroRegNum >= 0
|
||||
&& mop.getMachineRegNum()==(unsigned) target.zeroRegNum)))
|
||||
{
|
||||
regToRefVecMap[mop.getMachineRegNum()].
|
||||
push_back(make_pair(node, i));
|
||||
}
|
||||
|
||||
// ignore all other def operands
|
||||
if (minstr.operandIsDefined(i))
|
||||
continue;
|
||||
|
||||
switch(mop.getOperandType())
|
||||
{
|
||||
case MachineOperand::MO_VirtualRegister:
|
||||
case MachineOperand::MO_CCRegister:
|
||||
if (mop.getVRegValue())
|
||||
addSSAEdge(node, mop.getVRegValue(), target);
|
||||
break;
|
||||
|
||||
case MachineOperand::MO_MachineRegister:
|
||||
break;
|
||||
|
||||
case MachineOperand::MO_SignExtendedImmed:
|
||||
case MachineOperand::MO_UnextendedImmed:
|
||||
case MachineOperand::MO_PCRelativeDisp:
|
||||
break; // nothing to do for immediate fields
|
||||
|
||||
default:
|
||||
assert(0 && "Unknown machine operand type in SchedGraph builder");
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
// add all true, anti,
|
||||
// and output dependences for this register. but ignore
|
||||
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraph::buildGraph(const TargetMachine& target)
|
||||
{
|
||||
const MachineInstrInfo& mii = target.getInstrInfo();
|
||||
const BasicBlock* bb = bbVec[0];
|
||||
|
||||
assert(bbVec.size() == 1 && "Only handling a single basic block here");
|
||||
|
||||
// Use this data structures to note all LLVM memory instructions.
|
||||
// We use this to add memory dependence edges without a second full walk.
|
||||
//
|
||||
vector<const Instruction*> memVec;
|
||||
|
||||
// Use this data structures to note any uses or definitions of
|
||||
// machine registers so we can add edges for those later without
|
||||
// extra passes over the nodes.
|
||||
// The vector holds an ordered list of references to the machine reg,
|
||||
// ordered according to control-flow order. This only works for a
|
||||
// single basic block, hence the assertion. Each reference is identified
|
||||
// by the pair: <node, operand-number>.
|
||||
//
|
||||
NodeToRegRefMap regToRefVecMap;
|
||||
|
||||
// Make a dummy root node. We'll add edges to the real roots later.
|
||||
graphRoot = new SchedGraphNode(0, NULL, NULL, target);
|
||||
graphLeaf = new SchedGraphNode(1, NULL, NULL, target);
|
||||
|
||||
//----------------------------------------------------------------
|
||||
// First add nodes for all the machine instructions in the basic block.
|
||||
// This greatly simplifies identifing which edges to add.
|
||||
// Also, remember the load/store instructions to add memory deps later.
|
||||
//----------------------------------------------------------------
|
||||
|
||||
for (BasicBlock::const_iterator II = bb->begin(); II != bb->end(); ++II)
|
||||
{
|
||||
const Instruction *instr = *II;
|
||||
const MachineCodeForVMInstr& mvec = instr->getMachineInstrVec();
|
||||
for (unsigned i=0, N=mvec.size(); i < N; i++)
|
||||
if (! mii.isDummyPhiInstr(mvec[i]->getOpCode()))
|
||||
{
|
||||
SchedGraphNode* node = new SchedGraphNode(getNumNodes(),
|
||||
instr, mvec[i], target);
|
||||
this->noteGraphNodeForInstr(mvec[i], node);
|
||||
}
|
||||
|
||||
if (instr->getOpcode() == Instruction::Load ||
|
||||
instr->getOpcode() == Instruction::Store)
|
||||
memVec.push_back(instr);
|
||||
}
|
||||
|
||||
//----------------------------------------------------------------
|
||||
// Now add the edges.
|
||||
//----------------------------------------------------------------
|
||||
|
||||
// First, add edges to the terminator instruction of the basic block.
|
||||
this->addCDEdges(bb->getTerminator(), target);
|
||||
|
||||
// Then add memory dep edges: store->load, load->store, and store->store
|
||||
this->addMemEdges(memVec, target);
|
||||
|
||||
// Then add other edges for all instructions in the block.
|
||||
for (SchedGraph::iterator GI = this->begin(); GI != this->end(); ++GI)
|
||||
{
|
||||
SchedGraphNode* node = (*GI).second;
|
||||
addEdgesForInstruction(node, regToRefVecMap, target);
|
||||
}
|
||||
|
||||
// Then add edges for dependences on machine registers
|
||||
this->addMachineRegEdges(regToRefVecMap, target);
|
||||
|
||||
// Finally, add edges from the dummy root and to dummy leaf
|
||||
this->addDummyEdges();
|
||||
}
|
||||
|
||||
|
||||
//
|
||||
// class SchedGraphSet
|
||||
//
|
||||
|
||||
/*ctor*/
|
||||
SchedGraphSet::SchedGraphSet(const Method* _method,
|
||||
const TargetMachine& target) :
|
||||
method(_method)
|
||||
{
|
||||
buildGraphsForMethod(method, target);
|
||||
}
|
||||
|
||||
|
||||
/*dtor*/
|
||||
SchedGraphSet::~SchedGraphSet()
|
||||
{
|
||||
// delete all the graphs
|
||||
for (iterator I=begin(); I != end(); ++I)
|
||||
delete (*I).second;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraphSet::dump() const
|
||||
{
|
||||
cout << "======== Sched graphs for method `"
|
||||
<< (method->hasName()? method->getName() : "???")
|
||||
<< "' ========" << endl << endl;
|
||||
|
||||
for (const_iterator I=begin(); I != end(); ++I)
|
||||
(*I).second->dump();
|
||||
|
||||
cout << endl << "====== End graphs for method `"
|
||||
<< (method->hasName()? method->getName() : "")
|
||||
<< "' ========" << endl << endl;
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
SchedGraphSet::buildGraphsForMethod(const Method *method,
|
||||
const TargetMachine& target)
|
||||
{
|
||||
for (Method::const_iterator BI = method->begin(); BI != method->end(); ++BI)
|
||||
{
|
||||
SchedGraph* graph = new SchedGraph(*BI, target);
|
||||
this->noteGraphForBlock(*BI, graph);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
ostream&
|
||||
operator<<(ostream& os, const SchedGraphEdge& edge)
|
||||
{
|
||||
os << "edge [" << edge.src->getNodeId() << "] -> ["
|
||||
<< edge.sink->getNodeId() << "] : ";
|
||||
|
||||
switch(edge.depType) {
|
||||
case SchedGraphEdge::CtrlDep: os<< "Control Dep"; break;
|
||||
case SchedGraphEdge::DefUseDep: os<< "Reg Value " << edge.val; break;
|
||||
case SchedGraphEdge::MemoryDep: os<< "Mem Value " << edge.val; break;
|
||||
case SchedGraphEdge::MachineRegister: os<< "Reg " <<edge.machineRegNum;break;
|
||||
case SchedGraphEdge::MachineResource: os<<"Resource "<<edge.resourceId;break;
|
||||
default: assert(0); break;
|
||||
}
|
||||
|
||||
os << " : delay = " << edge.minDelay << endl;
|
||||
|
||||
return os;
|
||||
}
|
||||
|
||||
ostream&
|
||||
operator<<(ostream& os, const SchedGraphNode& node)
|
||||
{
|
||||
printIndent(4, os);
|
||||
os << "Node " << node.nodeId << " : "
|
||||
<< "latency = " << node.latency << endl;
|
||||
|
||||
printIndent(6, os);
|
||||
|
||||
if (node.getMachineInstr() == NULL)
|
||||
os << "(Dummy node)" << endl;
|
||||
else
|
||||
{
|
||||
os << *node.getMachineInstr() << endl;
|
||||
|
||||
printIndent(6, os);
|
||||
os << node.inEdges.size() << " Incoming Edges:" << endl;
|
||||
for (unsigned i=0, N=node.inEdges.size(); i < N; i++)
|
||||
{
|
||||
printIndent(8, os);
|
||||
os << * node.inEdges[i];
|
||||
}
|
||||
|
||||
printIndent(6, os);
|
||||
os << node.outEdges.size() << " Outgoing Edges:" << endl;
|
||||
for (unsigned i=0, N=node.outEdges.size(); i < N; i++)
|
||||
{
|
||||
printIndent(8, os);
|
||||
os << * node.outEdges[i];
|
||||
}
|
||||
}
|
||||
|
||||
return os;
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user