1 /* Title: InterferenceGraph.h
2 Author: Ruchira Sasanka
4 Purpose: Interference Graph used for register coloring.
7 Adj Info is stored in the lower trangular matrix (i.e., row > col )
9 This class must be used in the following way:
12 * call addLRToIG as many times to add ALL LRs to this IG
13 * call createGraph to create the actual matrix
14 * Then setInterference, getInterference, mergeIGNodesOfLRs can be
15 called as desired to modify the graph.
16 * Once the modifications to the graph are over, call
17 setCurDegreeOfIGNodes() before pushing IGNodes on to stack for coloring.
21 #ifndef INTERFERENCE_GRAPH_H
22 #define INTERFERENCE_GRAPH_H
25 #include "llvm/CodeGen/IGNode.h"
27 typedef vector <IGNode *> IGNodeListType;
30 class InterferenceGraph
32 char **IG; // a poiner to the interference graph
33 unsigned int Size; // size of a side of the IG
34 RegClass *const RegCl; // RegCl contains this IG
35 IGNodeListType IGNodeList; // a list of all IGNodes in a reg class
37 // for asserting this IG node is infact in the IGNodeList of this class
38 inline void assertIGNode(const IGNode *const Node) const {
39 assert( IGNodeList[ Node->getIndex() ] == Node );
46 // the matrix is not yet created by the constructor. Call createGraph()
47 // to create it after adding all IGNodes to the IGNodeList
49 InterferenceGraph(RegClass *const RC);
52 void addLRToIG(LiveRange *const LR);
54 void setInterference(const LiveRange *const LR1,
55 const LiveRange *const LR2 );
57 unsigned getInterference(const LiveRange *const LR1,
58 const LiveRange *const LR2 ) const ;
60 void mergeIGNodesOfLRs(const LiveRange *const LR1, LiveRange *const LR2);
62 inline IGNodeListType &getIGNodeList() { return IGNodeList; }
64 void setCurDegreeOfIGNodes();
67 void printIGNodeList() const;