diff --git a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
--- a/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
+++ b/llvm/lib/Target/Mips/AsmParser/MipsAsmParser.cpp
@@ -3087,6 +3087,7 @@
         MipsMCExpr::create(MipsMCExpr::MEK_HIGHER, SymExpr, getContext());
 
     bool RdRegIsRsReg =
+        UseSrcReg &&
         getContext().getRegisterInfo()->isSuperOrSubRegisterEq(DstReg, SrcReg);
 
     if (canUseATReg() && UseSrcReg && RdRegIsRsReg) {