llvm-6502/lib/Target/SparcV9/RegAlloc/InterferenceGraph.h

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/* Title: InterferenceGraph.h
Author: Ruchira Sasanka
Date: July 20, 01
Purpose: Interference Graph used for register coloring.
Notes:
Adj Info is stored in the lower trangular matrix (i.e., row > col )
This class must be used in the following way:
* Construct class
* call addLRToIG as many times to add ALL LRs to this IG
* call createGraph to create the actual matrix
* Then setInterference, getInterference, mergeIGNodesOfLRs can be
called as desired to modify the graph.
* Once the modifications to the graph are over, call
setCurDegreeOfIGNodes() before pushing IGNodes on to stack for coloring.
*/
#ifndef INTERFERENCE_GRAPH_H
#define INTERFERENCE_GRAPH_H
#include "llvm/CodeGen/IGNode.h"
typedef vector <IGNode *> IGNodeListType;
class InterferenceGraph
{
char **IG; // a poiner to the interference graph
unsigned int Size; // size of a side of the IG
RegClass *const RegCl; // RegCl contains this IG
IGNodeListType IGNodeList; // a list of all IGNodes in a reg class
// for asserting this IG node is infact in the IGNodeList of this class
inline void assertIGNode(const IGNode *const Node) const {
assert( IGNodeList[ Node->getIndex() ] == Node );
}
public:
// the matrix is not yet created by the constructor. Call createGraph()
// to create it after adding all IGNodes to the IGNodeList
InterferenceGraph(RegClass *const RC);
void createGraph();
void addLRToIG(LiveRange *const LR);
void setInterference(const LiveRange *const LR1,
const LiveRange *const LR2 );
unsigned getInterference(const LiveRange *const LR1,
const LiveRange *const LR2 ) const ;
void mergeIGNodesOfLRs(const LiveRange *const LR1, LiveRange *const LR2);
inline IGNodeListType &getIGNodeList() { return IGNodeList; }
void setCurDegreeOfIGNodes();
void printIG() const;
void printIGNodeList() const;
~InterferenceGraph();
};
#endif