diff --git a/llvm/utils/TableGen/CompressInstEmitter.cpp b/llvm/utils/TableGen/CompressInstEmitter.cpp
index afc892b068582..eb689bed8866d 100644
--- a/llvm/utils/TableGen/CompressInstEmitter.cpp
+++ b/llvm/utils/TableGen/CompressInstEmitter.cpp
@@ -161,7 +161,7 @@ bool CompressInstEmitter::validateRegister(const Record *Reg,
   assert(RegClass->isSubClassOf("RegisterClass") &&
          "RegClass record should be a RegisterClass");
   const CodeGenRegisterClass &RC = Target.getRegisterClass(RegClass);
-  const CodeGenRegister *R = Target.getRegisterByName(Reg->getName().lower());
+  const CodeGenRegister *R = Target.getRegBank().getReg(Reg);
   assert(R != nullptr && "Register not defined!!");
   return RC.contains(R);
 }