Some compilers are picky about accessing the first element of a std::vector if

there's nothing in the vector. Pacify them.

llvm-svn: 61536

1 files changed, 5 insertions, 2 deletions

diff --git a/llvm/include/llvm/CodeGen/ScheduleDAGSDNodes.h b/llvm/include/llvm/CodeGen/ScheduleDAGSDNodes.h
index d7f0ea49d48..b9c6428fba7 100644
--- a/llvm/include/llvm/CodeGen/ScheduleDAGSDNodes.h
+++ b/llvm/include/llvm/CodeGen/ScheduleDAGSDNodes.h
@@ -103,10 +103,13 @@ namespace llvm {
     ///
     SUnit *NewSUnit(SDNode *N) {
 #ifndef NDEBUG
-      const SUnit *Addr = &SUnits[0];
+      const SUnit *Addr = 0;
+      if (SUnits.size() > 0)
+        Addr = &SUnits[0];
 #endif
       SUnits.push_back(SUnit(N, (unsigned)SUnits.size()));
-      assert(Addr == &SUnits[0] && "SUnits std::vector reallocated on the fly!");
+      assert((Addr == 0 || Addr == &SUnits[0]) &&
+             "SUnits std::vector reallocated on the fly!");
       SUnits.back().OrigNode = &SUnits.back();
       return &SUnits.back();
     }