fix a common crash.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45614 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/MachineSink.cpp b/lib/CodeGen/MachineSink.cpp
index 0665e87f67ad9a88e6aa42d0e32411dba6fc6cd9..dff60f6d395410a53a61f56ec5b7e74ce7462085 100644 (file)
--- a/lib/CodeGen/MachineSink.cpp
+++ b/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);