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Simplify logic further.

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Ensure that we copy KnownProperties before calling visitBasicBlock, else
we may leak properties into blocks where they don't belong.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30705 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2006-10-03 17:36:01 +00:00
parent cd71da5cf0
commit f938099aa1
1 changed files with 8 additions and 17 deletions
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25
lib/Transforms/Scalar/PredicateSimplifier.cpp
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@ -650,31 +650,22 @@ void PredicateSimplifier::visit(BranchInst *BI, PropertySet &KP) {
BasicBlock *TrueDest = BI->getSuccessor(0),
*FalseDest = BI->getSuccessor(1);
if (Condition == ConstantBool::getTrue() || TrueDest == FalseDest) {
proceedToSuccessors(KP, BB);
return;
} else if (Condition == ConstantBool::getFalse()) {
if (isa<ConstantBool>(Condition) || TrueDest == FalseDest) {
proceedToSuccessors(KP, BB);
return;
}
DTNodeType *Node = DT->getNode(BB);
for (DTNodeType::iterator I = Node->begin(), E = Node->end(); I != E; ++I) {
if ((*I)->getBlock() == TrueDest) {
PropertySet TrueProperties(KP);
TrueProperties.addEqual(ConstantBool::getTrue(), Condition);
visitBasicBlock(TrueDest, TrueProperties);
continue;
}
BasicBlock *Dest = (*I)->getBlock();
PropertySet DestProperties(KP);
if ((*I)->getBlock() == FalseDest) {
PropertySet FalseProperties(KP);
FalseProperties.addEqual(ConstantBool::getFalse(), Condition);
visitBasicBlock(FalseDest, FalseProperties);
continue;
}
if (Dest == TrueDest)
DestProperties.addEqual(ConstantBool::getTrue(), Condition);
else if (Dest == FalseDest)
DestProperties.addEqual(ConstantBool::getFalse(), Condition);
visitBasicBlock((*I)->getBlock(), KP);
visitBasicBlock(Dest, DestProperties);
}
}