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122 lines
3.3 KiB
C++
122 lines
3.3 KiB
C++
/* Title: RegClass.h -*- C++ -*-
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Author: Ruchira Sasanka
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Date: Aug 20, 01
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Purpose: Contains machine independent methods for register coloring.
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This is the class that contains all data structures and common algos
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for coloring a particular register class (e.g., int class, fp class).
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This class is hardware independent. This class accepts a hardware
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dependent description of machine registers (MachineRegInfo class) to
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get hardware specific info and color and indidual IG node.
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This class contains the InterferenceGraph (IG).
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Also it contains an IGNode stack that can be used for coloring.
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The class provides some easy access methods to the IG methods, since these
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methods are called thru a register class.
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*/
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#ifndef REG_CLASS_H
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#define REG_CLASS_H
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#include "llvm/CodeGen/IGNode.h"
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#include "llvm/CodeGen/InterferenceGraph.h"
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#include "llvm/Target/Machine.h"
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#include "llvm/Target/RegInfo.h"
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#include <stack>
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typedef vector<unsigned int> ReservedColorListType;
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class RegClass
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{
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private:
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const Method *const Meth; // Method we are working on
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const MachineRegClassInfo *const MRC; // corresponding MRC
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const unsigned RegClassID; // my int ID
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InterferenceGraph IG; // Interference graph - constructed by
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// buildInterferenceGraph
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stack <IGNode *> IGNodeStack; // the stack used for coloring
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// for passing registered that are pre-allocated (e.g., %g's)
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const ReservedColorListType *const ReservedColorList;
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// An array used for coloring each node. This array must be of size
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// MRC->getNumOfAllRegs(). Allocated once in the constructor
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// for efficiency.
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bool *IsColorUsedArr;
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//------------ private methods ------------------
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void pushAllIGNodes();
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bool pushUnconstrainedIGNodes();
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IGNode * getIGNodeWithMinSpillCost();
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void colorIGNode(IGNode *const Node);
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public:
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RegClass(const Method *const M,
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const MachineRegClassInfo *const MRC,
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const ReservedColorListType *const RCL = NULL);
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inline void createInterferenceGraph()
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{ IG.createGraph(); }
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inline InterferenceGraph &getIG() { return IG; }
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inline const unsigned getID() const { return RegClassID; }
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void colorAllRegs(); // main method called for coloring regs
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inline unsigned getNumOfAvailRegs() const
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{ return MRC->getNumOfAvailRegs(); }
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~RegClass() { delete[] IsColorUsedArr; };
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// --- following methods are provided to access the IG contained within this
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// ---- RegClass easilly.
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inline void addLRToIG(LiveRange *const LR)
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{ IG.addLRToIG(LR); }
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inline void setInterference(const LiveRange *const LR1,
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const LiveRange *const LR2)
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{ IG.setInterference(LR1, LR2); }
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inline unsigned getInterference(const LiveRange *const LR1,
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const LiveRange *const LR2) const
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{ return IG.getInterference(LR1, LR2); }
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inline void mergeIGNodesOfLRs(const LiveRange *const LR1,
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LiveRange *const LR2)
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{ IG.mergeIGNodesOfLRs(LR1, LR2); }
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inline void printIGNodeList() const {
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cout << "IG Nodes for Register Class " << RegClassID << ":" << endl;
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IG.printIGNodeList();
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}
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inline void printIG() {
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cout << "IG for Register Class " << RegClassID << ":" << endl;
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IG.printIG();
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}
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};
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#endif
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