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Fix the updating of LiveIntervals after splitting a critical edge. PHI operand

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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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174935 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich 2013-02-12 03:49:17 +00:00
parent b0fde6dc02
commit dbf10c4349
1 changed files with 3 additions and 12 deletions
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15
lib/CodeGen/MachineBasicBlock.cpp
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@ -796,8 +796,8 @@ MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ, Pass *P) {
MachineOperand &MO = I->getOperand(ni); MachineOperand &MO = I->getOperand(ni);
unsigned Reg = MO.getReg(); unsigned Reg = MO.getReg();
PHISrcRegs.insert(Reg); PHISrcRegs.insert(Reg);
if (MO.isUndef() || !isLastMBB) if (MO.isUndef())
break; continue;
LiveInterval &LI = LIS->getInterval(Reg); LiveInterval &LI = LIS->getInterval(Reg);
VNInfo *VNI = LI.getVNInfoAt(PrevIndex); VNInfo *VNI = LI.getVNInfoAt(PrevIndex);
@ -817,16 +817,7 @@ MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ, Pass *P) {
if (!LI.liveAt(PrevIndex)) if (!LI.liveAt(PrevIndex))
continue; continue;
bool isLiveOut = false; bool isLiveOut = LI.liveAt(LIS->getMBBStartIdx(Succ));
for (MachineBasicBlock::succ_iterator SI = succ_begin(),
SE = succ_end(); SI != SE; ++SI) {
MachineBasicBlock *SuccMBB = *SI == NMBB ? Succ : *SI;
if (LI.liveAt(LIS->getMBBStartIdx(SuccMBB))) {
isLiveOut = true;
break;
}
}
if (isLiveOut && isLastMBB) { if (isLiveOut && isLastMBB) {
VNInfo *VNI = LI.getVNInfoAt(PrevIndex); VNInfo *VNI = LI.getVNInfoAt(PrevIndex);
assert(VNI && "LiveInterval should have VNInfo where it is live."); assert(VNI && "LiveInterval should have VNInfo where it is live.");