1 files changed, 15 insertions, 0 deletions
diff --git a/include/llvm/CodeGen/MachineInstr.h b/include/llvm/CodeGen/MachineInstr.h
index 7523825285a..88a697055e8 100644
--- a/include/llvm/CodeGen/MachineInstr.h
+++ b/include/llvm/CodeGen/MachineInstr.h
@@ -301,6 +301,21 @@ public:
     return Operands[i];
   }
 
+  /// Return true if operand \p OpIdx is a subregister index.
+  bool isOperandSubregIdx(unsigned OpIdx) const {
+    assert(getOperand(OpIdx).getType() == MachineOperand::MO_Immediate &&
+           "Expected MO_Immediate operand type.");
+    if (isExtractSubreg() && OpIdx == 2)
+      return true;
+    if (isInsertSubreg() && OpIdx == 3)
+      return true;
+    if (isRegSequence() && OpIdx > 1 && (OpIdx % 2) == 0)
+      return true;
+    if (isSubregToReg() && OpIdx == 3)
+      return true;
+    return false;
+  }
+
   /// Returns the number of non-implicit operands.
   unsigned getNumExplicitOperands() const;