Index: llvm/trunk/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp
===================================================================
--- llvm/trunk/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp
+++ llvm/trunk/lib/Target/Hexagon/AsmParser/HexagonAsmParser.cpp
@@ -581,6 +581,7 @@
   case Match_MnemonicFail:
     return Error(IDLoc, "unrecognized instruction");
   case Match_InvalidOperand:
+  case Match_InvalidTiedOperand:
     SMLoc ErrorLoc = IDLoc;
     if (ErrorInfo != ~0U) {
       if (ErrorInfo >= InstOperands.size())
Index: llvm/trunk/test/MC/Hexagon/tied-ops.s
===================================================================
--- llvm/trunk/test/MC/Hexagon/tied-ops.s
+++ llvm/trunk/test/MC/Hexagon/tied-ops.s
@@ -0,0 +1,6 @@
+# RUN: llvm-mc -arch=hexagon -filetype=asm %s 2> %t; FileCheck %s < %t
+
+# Check that tied operands are caught
+
+	{ r0 = sub(##_start, asl(r1, #1)) }
+# CHECK: error: invalid operand for instruction