Index: llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
===================================================================
--- llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -13133,6 +13133,16 @@
     return N0.getOperand(0);
   }
 
+  // trunc (sign_ext_inreg (anyext iN X), iM) to iN --> sign_ext_inreg X to iM
+  if (N0.getOpcode() == ISD::SIGN_EXTEND_INREG) {
+    SDValue N00 = N0.getOperand(0);
+    SDValue N01 = N0.getOperand(1);
+    if (N00.getOpcode() == ISD::ANY_EXTEND &&
+        N00.getOperand(0).getValueType() == VT)
+      return DAG.getNode(ISD::SIGN_EXTEND_INREG, SDLoc(N), VT,
+                         N00.getOperand(0), N01);
+  }
+
   // If this is anyext(trunc), don't fold it, allow ourselves to be folded.
   if (N->hasOneUse() && (N->use_begin()->getOpcode() == ISD::ANY_EXTEND))
     return SDValue();