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If BB is empty, insert PHI before end() instead of front().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90744 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -157,8 +157,9 @@ unsigned MachineSSAUpdater::GetValueInMiddleOfBlock(MachineBasicBlock *BB) {
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return SingularValue;
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// Otherwise, we do need a PHI: insert one now.
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MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->front();
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MachineInstr *InsertedPHI = InsertNewDef(TargetInstrInfo::PHI, BB,
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BB->front(), VRC, MRI, TII);
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Loc, VRC, MRI, TII);
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// Fill in all the predecessors of the PHI.
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MachineInstrBuilder MIB(InsertedPHI);
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@ -231,7 +232,8 @@ unsigned MachineSSAUpdater::GetValueAtEndOfBlockInternal(MachineBasicBlock *BB){
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// that we have a cycle. Handle this by inserting a PHI node and returning
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// it. When we get back to the first instance of the recursion we will fill
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// in the PHI node.
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MachineInstr *NewPHI = InsertNewDef(TargetInstrInfo::PHI, BB, BB->front(),
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MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->front();
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MachineInstr *NewPHI = InsertNewDef(TargetInstrInfo::PHI, BB, Loc,
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VRC, MRI,TII);
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unsigned NewVR = NewPHI->getOperand(0).getReg();
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InsertRes.first->second = NewVR;
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@ -311,7 +313,8 @@ unsigned MachineSSAUpdater::GetValueAtEndOfBlockInternal(MachineBasicBlock *BB){
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// Otherwise, we do need a PHI: insert one now if we don't already have one.
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MachineInstr *InsertedPHI;
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if (InsertedVal == 0) {
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InsertedPHI = InsertNewDef(TargetInstrInfo::PHI, BB, BB->front(),
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MachineBasicBlock::iterator Loc = BB->empty() ? BB->end() : BB->front();
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InsertedPHI = InsertNewDef(TargetInstrInfo::PHI, BB, Loc,
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VRC, MRI, TII);
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InsertedVal = InsertedPHI->getOperand(0).getReg();
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} else {
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