diff --git a/llvm/lib/Target/CSKY/MCTargetDesc/CSKYAsmBackend.cpp b/llvm/lib/Target/CSKY/MCTargetDesc/CSKYAsmBackend.cpp
--- a/llvm/lib/Target/CSKY/MCTargetDesc/CSKYAsmBackend.cpp
+++ b/llvm/lib/Target/CSKY/MCTargetDesc/CSKYAsmBackend.cpp
@@ -295,7 +295,7 @@
 
   switch (Inst.getOpcode()) {
   default:
-    Inst.dump();
+    LLVM_DEBUG(Inst.dump());
     llvm_unreachable("Opcode not expected!");
   case CSKY::LRW16:
     Res.setOpcode(CSKY::LRW32);