Fix the updating of LiveIntervals after splitting a critical edge. PHI operand
live ranges should always be extended, and the only successor that should be considered for extension of other ranges is the target of the split edge. llvm-svn: 174935
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@ -796,8 +796,8 @@ MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ, Pass *P) {
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MachineOperand &MO = I->getOperand(ni);
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unsigned Reg = MO.getReg();
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PHISrcRegs.insert(Reg);
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if (MO.isUndef() || !isLastMBB)
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break;
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if (MO.isUndef())
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continue;
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LiveInterval &LI = LIS->getInterval(Reg);
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VNInfo *VNI = LI.getVNInfoAt(PrevIndex);
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@ -817,16 +817,7 @@ MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ, Pass *P) {
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if (!LI.liveAt(PrevIndex))
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continue;
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bool isLiveOut = false;
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for (MachineBasicBlock::succ_iterator SI = succ_begin(),
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SE = succ_end(); SI != SE; ++SI) {
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MachineBasicBlock *SuccMBB = *SI == NMBB ? Succ : *SI;
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if (LI.liveAt(LIS->getMBBStartIdx(SuccMBB))) {
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isLiveOut = true;
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break;
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}
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}
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bool isLiveOut = LI.liveAt(LIS->getMBBStartIdx(Succ));
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if (isLiveOut && isLastMBB) {
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VNInfo *VNI = LI.getVNInfoAt(PrevIndex);
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assert(VNI && "LiveInterval should have VNInfo where it is live.");
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