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Fix infinite loop in DSE when deleting a free in a reachable loop that's also

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trivially infinite.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146197 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2011-12-08 22:36:35 +00:00
parent e955726a0e
commit c9b98ad7a7
2 changed files with 11 additions and 1 deletions
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2
lib/Transforms/Scalar/DeadStoreElimination.cpp
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@ -624,6 +624,7 @@ static void FindUnconditionalPreds(SmallVectorImpl<BasicBlock *> &Blocks,
BasicBlock *BB, DominatorTree *DT) {
for (pred_iterator I = pred_begin(BB), E = pred_end(BB); I != E; ++I) {
BasicBlock *Pred = *I;
if (Pred == BB) continue;
TerminatorInst *PredTI = Pred->getTerminator();
if (PredTI->getNumSuccessors() != 1)
continue;
@ -853,4 +854,3 @@ void DSE::RemoveAccessedObjects(const AliasAnalysis::Location &LoadedLoc,
I != E; ++I)
DeadStackObjects.erase(*I);
}

10
test/Transforms/DeadStoreElimination/free.ll
View File

@ -58,3 +58,13 @@ skipinit1:
tail call void @free(i8* %alloc1) nounwind
ret void
}
; CHECK: @test5
define void @test5() {
br label %bb
bb:
tail call void @free(i8* undef) nounwind
br label %bb
}