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When a priority_queue is empty, the behavior of top() operator is

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non-deterministic. Returns NULL when it's empty!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28560 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-05-30 18:04:34 +00:00
parent 85ede37ca9
commit 19564e3d83
1 changed files with 1 additions and 0 deletions
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lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp
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@ -356,6 +356,7 @@ public:
} }
SUnit *pop() { SUnit *pop() {
if (empty()) return NULL;
SUnit *V = Queue.top(); SUnit *V = Queue.top();
Queue.pop(); Queue.pop();
return V; return V;