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author | Evan Cheng <evan.cheng@apple.com> | 2006-05-30 18:04:34 +0000 |
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committer | Evan Cheng <evan.cheng@apple.com> | 2006-05-30 18:04:34 +0000 |
commit | 61e9f0d6809ae939f14539b02b73860db0df4ab7 (patch) | |
tree | 43123b576c5b6c8f240f4317d3bd191958cb9480 /llvm/lib/CodeGen/SelectionDAG | |
parent | 5bc60da1123dc75b71697f6c667091db53c4130a (diff) | |
download | bcm5719-llvm-61e9f0d6809ae939f14539b02b73860db0df4ab7.tar.gz bcm5719-llvm-61e9f0d6809ae939f14539b02b73860db0df4ab7.zip |
When a priority_queue is empty, the behavior of top() operator is
non-deterministic. Returns NULL when it's empty!
llvm-svn: 28560
Diffstat (limited to 'llvm/lib/CodeGen/SelectionDAG')
-rw-r--r-- | llvm/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp index c9aa18a342e..ad8ed5aaf97 100644 --- a/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/ScheduleDAGList.cpp @@ -356,6 +356,7 @@ public: } SUnit *pop() { + if (empty()) return NULL; SUnit *V = Queue.top(); Queue.pop(); return V; |