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uniform phi-copy in divergent CF 3rd

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improve the fix by checking liveness
This commit is contained in:
Gang Y Chen
2023-03-14 17:24:08 +00:00
committed by igcbot
parent 15650267db
commit 6d3cdf28bc
1 changed files with 10 additions and 9 deletions
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15
IGC/Compiler/CISACodeGen/DeSSA.cpp
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@ -963,15 +963,16 @@ DeSSA::SplitInterferencesForBasicBlock(
unsigned PredIndex;
for (PredIndex = 0; PredIndex < PHI->getNumOperands();
++PredIndex) {
auto PBB = PHI->getIncomingBlock(PredIndex);
if (WIA->insideDivergentCF(PBB->getTerminator())) {
Value *PredValue = PHI->getOperand(PredIndex);
// check if we will need to add a phi-copy from PBB
if (isa<Constant>(PredValue) || isIsolated(PredValue)) {
isolateReg(PHI);
if (PHI->getIncomingBlock(PredIndex) == MBB)
break;
}
}
IGC_ASSERT(PredIndex < PHI->getNumOperands());
Value *PredValue = PHI->getOperand(PredIndex);
// check if we will need to add a phi-copy from MBB
if (isa<Constant>(PredValue) || isIsolated(PredValue)) {
// adding a phi-copy interferes with current live-out
if (CurrentDominatingParent[RootC])
isolateReg(PHI);
}
}
}