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info (since multiple reg types may share the same reg class).
(2) Remove machine-specific regalloc. methods that are no longer needed.
In particular, arguments and return value from a call do not need
machine-specific code for allocation.
(3) Rename TargetRegInfo::getRegType variants to avoid unintentional
overloading when an include file is omitted.
llvm-svn: 7329
134 lines
4.2 KiB
C++
134 lines
4.2 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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*/
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#ifndef REG_CLASS_H
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#define REG_CLASS_H
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#include "llvm/Target/TargetRegInfo.h"
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#include "InterferenceGraph.h"
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#include <stack>
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class TargetRegClassInfo;
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//-----------------------------------------------------------------------------
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// Class RegClass
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//
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// Implements a machine independant register class.
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//
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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 (TargetRegInfo class) to
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// get hardware specific info and to color an individual IG node.
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//
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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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//-----------------------------------------------------------------------------
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class RegClass {
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const Function *const Meth; // Function we are working on
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const TargetRegInfo *MRI; // Machine register information
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const TargetRegClassInfo *const MRC; // Machine reg. class for this RegClass
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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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std::stack<IGNode *> IGNodeStack; // the stack used for coloring
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// IsColorUsedArr - An array used for coloring each node. This array must be
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// of size MRC->getNumOfAllRegs(). Allocated once in the constructor for
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// efficiency.
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//
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std::vector<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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// This directly marks the colors used by a particular register number
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// within the register class. External users should use the public
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// versions of this function below.
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inline void markColorUsed(unsigned classRegNum) {
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assert(classRegNum < IsColorUsedArr.size() && "Invalid register used?");
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IsColorUsedArr[classRegNum] = true;
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}
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inline bool isColorUsed(unsigned regNum) const {
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assert(regNum < IsColorUsedArr.size() && "Invalid register used?");
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return IsColorUsedArr[regNum];
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}
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public:
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RegClass(const Function *M,
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const TargetRegInfo *_MRI_,
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const TargetRegClassInfo *_MRC_);
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inline void createInterferenceGraph() { 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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inline const TargetRegClassInfo* getTargetRegClass() const { return MRC; }
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// main method called for coloring regs
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//
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void colorAllRegs();
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inline unsigned getNumOfAvailRegs() const
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{ return MRC->getNumOfAvailRegs(); }
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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 clearColorsUsed() {
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IsColorUsedArr.clear();
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IsColorUsedArr.resize(MRC->getNumOfAllRegs());
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}
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inline void markColorsUsed(unsigned ClassRegNum,
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int UserRegType,
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int RegTypeWanted) {
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MRC->markColorsUsed(ClassRegNum, UserRegType, RegTypeWanted,IsColorUsedArr);
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}
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inline int getUnusedColor(int machineRegType) const {
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return MRC->findUnusedColor(machineRegType, IsColorUsedArr);
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}
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void printIGNodeList() const;
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void printIG();
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};
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#endif
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