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NewGVN: Fix memory congruence verification. The return true should be a return false. Merge the appropriate if statements so it doesn't happen again.

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llvm-svn: 300584
This commit is contained in:
Daniel Berlin 2017-04-18 20:15:47 +00:00
parent 047ba89d96
commit 3aa04388f3
1 changed files with 8 additions and 8 deletions
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16
lib/Transforms/Scalar/NewGVN.cpp
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@ -138,7 +138,8 @@ PHIExpression::~PHIExpression() = default;
// It also wants to hand us SCC's that are unrelated to the phi node we ask
// about, and have us process them there or risk redoing work.
// Graph traits over a filter iterator also doesn't work that well here.
// This SCC finder is specialized to walk use-def chains, and only follows instructions,
// This SCC finder is specialized to walk use-def chains, and only follows
// instructions,
// not generic values (arguments, etc).
struct TarjanSCC {
@ -170,8 +171,10 @@ private:
Root[I] = std::min(Root.lookup(I), Root.lookup(Op));
}
}
// See if we really were the root of a component, by seeing if we still have our DFSNumber.
// If we do, we are the root of the component, and we have completed a component. If we do not,
// See if we really were the root of a component, by seeing if we still have
// our DFSNumber.
// If we do, we are the root of the component, and we have completed a
// component. If we do not,
// we are not the root of a component, and belong on the component stack.
if (Root.lookup(I) == OurDFS) {
unsigned ComponentID = Components.size();
@ -2519,14 +2522,11 @@ void NewGVN::verifyMemoryCongruency() const {
auto ReachableAccessPred =
[&](const std::pair<const MemoryAccess *, CongruenceClass *> Pair) {
bool Result = ReachableBlocks.count(Pair.first->getBlock());
if (!Result)
if (!Result || MSSA->isLiveOnEntryDef(Pair.first) ||
MemoryToDFSNum(Pair.first) == 0)
return false;
if (MSSA->isLiveOnEntryDef(Pair.first))
return true;
if (auto *MemDef = dyn_cast<MemoryDef>(Pair.first))
return !isInstructionTriviallyDead(MemDef->getMemoryInst());
if (MemoryToDFSNum(Pair.first) == 0)
return false;
return true;
};