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Fixed a bug in spill cost estimation
llvm-svn: 1500
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@ -150,9 +150,9 @@ IGNode * RegClass::getIGNodeWithMinSpillCost()
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{
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unsigned int IGNodeListSize = IG.getIGNodeList().size();
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long MinSpillCost = -1;
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double MinSpillCost;
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IGNode *MinCostIGNode = NULL;
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bool isFirstNode = true;
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// pass over IGNodeList to find the IGNode with minimum spill cost
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// among all IGNodes that are not yet pushed on to the stack
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@ -165,11 +165,13 @@ IGNode * RegClass::getIGNodeWithMinSpillCost()
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if( ! IGNode->isOnStack() ) {
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long SpillCost = (long) IGNode->getParentLR()->getSpillCost();
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double SpillCost = (double) IGNode->getParentLR()->getSpillCost() /
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(double) (IGNode->getCurDegree() + 1);
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if( MinSpillCost == -1) { // for the first IG node
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if( isFirstNode ) { // for the first IG node
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MinSpillCost = SpillCost;
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MinCostIGNode = IGNode;
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isFirstNode = false;
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}
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else if( MinSpillCost > SpillCost) {
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