fix a common crash.

llvm-svn: 45614
2008-01-05 01:39:17 +00:00
parent e666bc272d
commit 6ec78274df
1 changed files with 4 additions and 0 deletions
--- a/llvm/lib/CodeGen/MachineSink.cpp
+++ b/llvm/lib/CodeGen/MachineSink.cpp
@@ -180,6 +180,10 @@ bool MachineSinking::SinkInstruction(MachineInstr *MI) {
    }
  }
  
+  // If there are no outputs, it must have side-effects.
+  if (SuccToSinkTo == 0)
+    return false;
+  
  // FIXME: Check that the instr doesn't have side effects etc.
  
  DEBUG(cerr << "Sink instr " << *MI);