diff --git a/lib/Target/R600/AMDILISelDAGToDAG.cpp b/lib/Target/R600/AMDILISelDAGToDAG.cpp
index 83d94d3..c55b3a3 100644
--- a/lib/Target/R600/AMDILISelDAGToDAG.cpp
+++ b/lib/Target/R600/AMDILISelDAGToDAG.cpp
@@ -677,7 +677,9 @@ void AMDGPUDAGToDAGISel::PostprocessISelDAG() {
 
       const MCInstrDesc Desc = TM.getInstrInfo()->get(Val.getNode()->getMachineOpcode());
       const TargetRegisterInfo *TRI = TM.getRegisterInfo();
-      RegInfo->setRegClass(Reg, TRI->getRegClass(Desc.OpInfo[0].RegClass));
+      //Desc.OpInfo[0].RegClass is -1 here for the mentioned kernel
+      if (Desc.OpInfo[0].RegClass >= 0)
+        RegInfo->setRegClass(Reg, TRI->getRegClass(Desc.OpInfo[0].RegClass));
       continue;
     }
     }