[llvm-commits] [llvm] r62576 - /llvm/trunk/include/llvm/CodeGen/ScheduleDAGInstrs.h

[Duncan Sands]

Author: baldrick
Date: Tue Jan 20 03:05:19 2009
New Revision: 62576

URL: http://llvm.org/viewvc/llvm-project?rev=62576&view=rev
Log:
If a vector is empty, you're not allowed to access any
elements, even if it is only to take the address.  Test:
break-anti-dependencies.ll with ENABLE_EXPENSIVE_CHECKS.

Modified:
    llvm/trunk/include/llvm/CodeGen/ScheduleDAGInstrs.h

Modified: llvm/trunk/include/llvm/CodeGen/ScheduleDAGInstrs.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/CodeGen/ScheduleDAGInstrs.h?rev=62576&r1=62575&r2=62576&view=diff

==============================================================================
--- llvm/trunk/include/llvm/CodeGen/ScheduleDAGInstrs.h (original)
+++ llvm/trunk/include/llvm/CodeGen/ScheduleDAGInstrs.h Tue Jan 20 03:05:19 2009
@@ -49,10 +49,11 @@
     ///
     SUnit *NewSUnit(MachineInstr *MI) {
 #ifndef NDEBUG
-      const SUnit *Addr = &SUnits[0];
+      const SUnit *Addr = SUnits.empty() ? 0 : &SUnits[0];
 #endif
       SUnits.push_back(SUnit(MI, (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();
     }