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Correctly mark a valno that was previous defined by a PHI node as having an

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unknown defining inst after PHI elimination.

llvm-svn: 49069
This commit is contained in:
Owen Anderson 2008-04-02 02:12:45 +00:00
parent 0d6e900c28
commit 249571b638
1 changed files with 7 additions and 4 deletions
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11
lib/CodeGen/StrongPHIElimination.cpp
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@ -845,7 +845,6 @@ void StrongPHIElimination::mergeLiveIntervals(unsigned primary,
}
bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
LiveIntervals& LI = getAnalysis<LiveIntervals>();
// Compute DFS numbers of each block
@ -889,17 +888,21 @@ bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
// If this is a dead PHI node, then remove it from LiveIntervals.
unsigned DestReg = PInstr->getOperand(0).getReg();
LiveInterval& PI = LI.getInterval(DestReg);
if (PInstr->registerDefIsDead(DestReg)) {
LiveInterval& PI = LI.getInterval(DestReg);
if (PI.containsOneValue()) {
LI.removeInterval(DestReg);
} else {
unsigned idx = LI.getDefIndex(LI.getInstructionIndex(PInstr));
PI.removeRange(*PI.getLiveRangeContaining(idx), true);
}
} else {
// If the PHI is not dead, then the valno defined by the PHI
// now has an unknown def.
unsigned idx = LI.getDefIndex(LI.getInstructionIndex(PInstr));
PI.getLiveRangeContaining(idx)->valno->def = ~0U;
}
LI.RemoveMachineInstrFromMaps(PInstr);
PInstr->eraseFromParent();
}