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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.

llvm-svn: 174935
This commit is contained in:
Cameron Zwarich 2013-02-12 03:49:17 +00:00
parent 223060498a
commit 98da22672b
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);
unsigned Reg = MO.getReg();
PHISrcRegs.insert(Reg);
if (MO.isUndef() || !isLastMBB)
break;
if (MO.isUndef())
continue;
LiveInterval &LI = LIS->getInterval(Reg);
VNInfo *VNI = LI.getVNInfoAt(PrevIndex);
@ -817,16 +817,7 @@ MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ, Pass *P) {
if (!LI.liveAt(PrevIndex))
continue;
bool isLiveOut = false;
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;
}
}
bool isLiveOut = LI.liveAt(LIS->getMBBStartIdx(Succ));
if (isLiveOut && isLastMBB) {
VNInfo *VNI = LI.getVNInfoAt(PrevIndex);
assert(VNI && "LiveInterval should have VNInfo where it is live.");