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[SelectionDAG] Fix an use-after-free issue introduced in r305775.

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vector.back() will be invalidated when memory reallocation happens.

llvm-svn: 305785
This commit is contained in:
Haojian Wu 2017-06-20 09:29:43 +00:00
parent 4e3209ead1
commit d2efe6d376
1 changed files with 2 additions and 2 deletions
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4
lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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@ -1888,10 +1888,10 @@ CalcNodeSethiUllmanNumber(const SUnit *SU, std::vector<unsigned> &SUNumbers) {
for (auto It : WorkList)
assert(It.SU != PredSU && "Trying to push an element twice?");
#endif
WorkList.push_back(PredSU);
AllPredsKnown = false;
// Next time start processing this one starting from the next pred.
Temp.PredsProcessed = P + 1;
WorkList.push_back(PredSU);
AllPredsKnown = false;
break;
}
}