mirror of
https://github.com/c64scene-ar/llvm-6502.git
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551ccae044
Move include/Config and include/Support into include/llvm/Config, include/llvm/ADT and include/llvm/Support. From here on out, all LLVM public header files must be under include/llvm/. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16137 91177308-0d34-0410-b5e6-96231b3b80d8
248 lines
8.1 KiB
C++
248 lines
8.1 KiB
C++
//===-- InterferenceGraph.cpp ---------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Interference graph for coloring-based register allocation for LLVM.
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//
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//===----------------------------------------------------------------------===//
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#include "IGNode.h"
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#include "InterferenceGraph.h"
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#include "RegAllocCommon.h"
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#include "llvm/ADT/STLExtras.h"
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#include <algorithm>
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#include <iostream>
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namespace llvm {
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// for asserting this IG node is infact in the IGNodeList of this class
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inline static void assertIGNode(const InterferenceGraph *IG,
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const IGNode *Node) {
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assert(IG->getIGNodeList()[Node->getIndex()] == Node);
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}
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//-----------------------------------------------------------------------------
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// Constructor: Records the RegClass and initalizes IGNodeList.
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// The matrix is NOT yet created by the constructor. Call createGraph()
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// to create it after adding all IGNodes to the IGNodeList.
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//-----------------------------------------------------------------------------
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InterferenceGraph::InterferenceGraph(RegClass *const RC) : RegCl(RC) {
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IG = NULL;
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Size = 0;
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if( DEBUG_RA >= RA_DEBUG_Interference)
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std::cerr << "Interference graph created!\n";
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}
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//-----------------------------------------------------------------------------
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// destructor. Deletes the bit matrix and all IGNodes
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//-----------------------------------------------------------------------------
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InterferenceGraph:: ~InterferenceGraph() {
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// delete the matrix
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for(unsigned int r=0; r < IGNodeList.size(); ++r)
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delete[] IG[r];
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delete[] IG;
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// delete all IGNodes in the IGNodeList
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for_each(IGNodeList.begin(), IGNodeList.end(), deleter<IGNode>);
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}
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//-----------------------------------------------------------------------------
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// Creates (dynamically allocates) the bit matrix necessary to hold the
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// interference graph.
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//-----------------------------------------------------------------------------
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void InterferenceGraph::createGraph()
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{
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Size = IGNodeList.size();
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IG = new char*[Size];
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for( unsigned int r=0; r < Size; ++r)
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IG[r] = new char[Size];
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// init IG matrix
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for(unsigned int i=0; i < Size; i++)
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for(unsigned int j=0; j < Size; j++)
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IG[i][j] = 0;
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}
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//-----------------------------------------------------------------------------
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// creates a new IGNode for the given live range and add to IG
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//-----------------------------------------------------------------------------
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void InterferenceGraph::addLRToIG(LiveRange *const LR)
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{
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IGNodeList.push_back(new IGNode(LR, IGNodeList.size()));
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}
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//-----------------------------------------------------------------------------
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// set interference for two live ranges
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// update both the matrix and AdjLists of nodes.
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// If there is already an interference between LR1 and LR2, adj lists
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// are not updated. LR1 and LR2 must be distinct since if not, it suggests
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// that there is some wrong logic in some other method.
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//-----------------------------------------------------------------------------
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void InterferenceGraph::setInterference(const LiveRange *const LR1,
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const LiveRange *const LR2 ) {
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assert(LR1 != LR2);
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IGNode *IGNode1 = LR1->getUserIGNode();
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IGNode *IGNode2 = LR2->getUserIGNode();
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assertIGNode(this, IGNode1);
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assertIGNode(this, IGNode2);
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unsigned row = IGNode1->getIndex();
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unsigned col = IGNode2->getIndex();
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char *val;
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if( DEBUG_RA >= RA_DEBUG_Interference)
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std::cerr << "setting intf for: [" << row << "][" << col << "]\n";
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( row > col) ? val = &IG[row][col]: val = &IG[col][row];
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if( ! (*val) ) { // if this interf is not previously set
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*val = 1; // add edges between nodes
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IGNode1->addAdjIGNode( IGNode2 );
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IGNode2->addAdjIGNode( IGNode1 );
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}
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}
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//----------------------------------------------------------------------------
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// return whether two live ranges interfere
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//----------------------------------------------------------------------------
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unsigned InterferenceGraph::getInterference(const LiveRange *const LR1,
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const LiveRange *const LR2) const {
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assert(LR1 != LR2);
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assertIGNode(this, LR1->getUserIGNode());
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assertIGNode(this, LR2->getUserIGNode());
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const unsigned int row = LR1->getUserIGNode()->getIndex();
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const unsigned int col = LR2->getUserIGNode()->getIndex();
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char ret;
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if (row > col)
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ret = IG[row][col];
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else
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ret = IG[col][row];
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return ret;
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}
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//----------------------------------------------------------------------------
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// Merge 2 IGNodes. The neighbors of the SrcNode will be added to the DestNode.
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// Then the IGNode2L will be deleted. Necessary for coalescing.
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// IMPORTANT: The live ranges are NOT merged by this method. Use
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// LiveRangeInfo::unionAndUpdateLRs for that purpose.
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//----------------------------------------------------------------------------
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void InterferenceGraph::mergeIGNodesOfLRs(const LiveRange *LR1,
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LiveRange *LR2) {
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assert( LR1 != LR2); // cannot merge the same live range
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IGNode *const DestNode = LR1->getUserIGNode();
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IGNode *SrcNode = LR2->getUserIGNode();
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assertIGNode(this, DestNode);
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assertIGNode(this, SrcNode);
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if( DEBUG_RA >= RA_DEBUG_Interference) {
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std::cerr << "Merging LRs: \"" << *LR1 << "\" and \"" << *LR2 << "\"\n";
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}
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unsigned SrcDegree = SrcNode->getNumOfNeighbors();
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const unsigned SrcInd = SrcNode->getIndex();
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// for all neighs of SrcNode
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for(unsigned i=0; i < SrcDegree; i++) {
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IGNode *NeighNode = SrcNode->getAdjIGNode(i);
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LiveRange *const LROfNeigh = NeighNode->getParentLR();
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// delete edge between src and neigh - even neigh == dest
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NeighNode->delAdjIGNode(SrcNode);
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// set the matrix posn to 0 betn src and neigh - even neigh == dest
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const unsigned NInd = NeighNode->getIndex();
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( SrcInd > NInd) ? (IG[SrcInd][NInd]=0) : (IG[NInd][SrcInd]=0) ;
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if( LR1 != LROfNeigh) { // if the neigh != dest
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// add edge betwn Dest and Neigh - if there is no current edge
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setInterference(LR1, LROfNeigh );
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}
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}
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IGNodeList[ SrcInd ] = NULL;
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// SrcNode is no longer necessary - LR2 must be deleted by the caller
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delete( SrcNode );
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}
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//----------------------------------------------------------------------------
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// must be called after modifications to the graph are over but before
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// pushing IGNodes on to the stack for coloring.
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//----------------------------------------------------------------------------
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void InterferenceGraph::setCurDegreeOfIGNodes()
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{
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unsigned Size = IGNodeList.size();
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for( unsigned i=0; i < Size; i++) {
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IGNode *Node = IGNodeList[i];
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if( Node )
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Node->setCurDegree();
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}
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}
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//--------------------- debugging (Printing) methods -----------------------
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//----------------------------------------------------------------------------
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// Print the IGnodes
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//----------------------------------------------------------------------------
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void InterferenceGraph::printIG() const {
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for(unsigned i=0; i < Size; i++) {
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const IGNode *const Node = IGNodeList[i];
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if(Node) {
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std::cerr << " [" << i << "] ";
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for( unsigned int j=0; j < Size; j++)
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if(IG[i][j])
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std::cerr << "(" << i << "," << j << ") ";
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std::cerr << "\n";
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}
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}
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}
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//----------------------------------------------------------------------------
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// Print the IGnodes in the IGNode List
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//----------------------------------------------------------------------------
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void InterferenceGraph::printIGNodeList() const {
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for(unsigned i=0; i < IGNodeList.size() ; ++i) {
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const IGNode *const Node = IGNodeList[i];
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if (Node)
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std::cerr << " [" << Node->getIndex() << "] " << *Node->getParentLR()
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<< "\t <# of Neighbors: " << Node->getNumOfNeighbors() << ">\n";
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}
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}
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} // End llvm namespace
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