Index: lib/Target/X86/X86ISelDAGToDAG.cpp
===================================================================
--- lib/Target/X86/X86ISelDAGToDAG.cpp
+++ lib/Target/X86/X86ISelDAGToDAG.cpp
@@ -2886,19 +2886,7 @@
 
       if (Opcode == X86ISD::UDIVREM8_ZEXT_HREG ||
           Opcode == X86ISD::SDIVREM8_SEXT_HREG) {
-        if (Node->getValueType(1) == MVT::i64) {
-          // It's not possible to directly movsx AH to a 64bit register, because
-          // the latter needs the REX prefix, but the former can't have it.
-          assert(Opcode != X86ISD::SDIVREM8_SEXT_HREG &&
-                 "Unexpected i64 sext of h-register");
-          Result =
-              SDValue(CurDAG->getMachineNode(
-                          TargetOpcode::SUBREG_TO_REG, dl, MVT::i64,
-                          CurDAG->getTargetConstant(0, dl, MVT::i64), Result,
-                          CurDAG->getTargetConstant(X86::sub_32bit, dl,
-                                                    MVT::i32)),
-                      0);
-        }
+        assert(Node->getValueType(1) == MVT::i32 && "Unexpected type!");
       } else {
         Result =
             CurDAG->getTargetExtractSubreg(X86::sub_8bit, dl, MVT::i8, Result);