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For real this time: PHI Def & Kill tracking added to PHIElimination. 

llvm-svn: 76865
This commit is contained in:
Lang Hames 2009-07-23 05:44:24 +00:00
parent 7152d39d6d
commit 077415e84b
1 changed files with 5 additions and 3 deletions
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8
llvm/lib/CodeGen/PHIElimination.cpp
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@ -50,6 +50,8 @@ void llvm::PHIElimination::getAnalysisUsage(AnalysisUsage &AU) const {
bool llvm::PHIElimination::runOnMachineFunction(MachineFunction &Fn) {
MRI = &Fn.getRegInfo();
PHIDefs.clear();
PHIKills.clear();
analyzePHINodes(Fn);
bool Changed = false;
@ -183,8 +185,8 @@ void llvm::PHIElimination::LowerAtomicPHINode(
}
// Record PHI def.
//assert(!hasPHIDef(DestReg) && "Vreg has multiple phi-defs?");
//PHIDefs[DestReg] = &MBB;
assert(!hasPHIDef(DestReg) && "Vreg has multiple phi-defs?");
PHIDefs[DestReg] = &MBB;
// Update live variable information if there is any.
LiveVariables *LV = getAnalysisIfAvailable<LiveVariables>();
@ -232,7 +234,7 @@ void llvm::PHIElimination::LowerAtomicPHINode(
MachineBasicBlock &opBlock = *MPhi->getOperand(i*2+2).getMBB();
// Record the kill.
//PHIKills[SrcReg].insert(&opBlock);
PHIKills[SrcReg].insert(&opBlock);
// If source is defined by an implicit def, there is no need to insert a
// copy.