Index: lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
===================================================================
--- lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
+++ lib/Target/SystemZ/SystemZISelDAGToDAG.cpp
@@ -745,6 +745,14 @@
   SDValue N = RxSBG.Input;
   unsigned Opcode = N.getOpcode();
   switch (Opcode) {
+  case ISD::TRUNCATE: {
+    uint64_t BitSize = N.getValueType().getSizeInBits();
+    uint64_t Mask = allOnes(BitSize);
+    if (!refineRxSBGMask(RxSBG, Mask))
+      return false;
+    RxSBG.Input = N.getOperand(0);
+    return true;
+  }
   case ISD::AND: {
     if (RxSBG.Opcode == SystemZ::RNSBG)
       return false;
@@ -916,7 +924,8 @@
   RxSBGOperands RISBG(SystemZ::RISBG, SDValue(N, 0));
   unsigned Count = 0;
   while (expandRxSBG(RISBG))
-    if (RISBG.Input.getOpcode() != ISD::ANY_EXTEND)
+    if (RISBG.Input.getOpcode() != ISD::ANY_EXTEND &&
+        RISBG.Input.getOpcode() != ISD::TRUNCATE)
       Count += 1;
   if (Count == 0)
     return false;