diff --git a/src/mapleall/maple_be/src/cg/aarch64/aarch64_peep.cpp b/src/mapleall/maple_be/src/cg/aarch64/aarch64_peep.cpp
index ba396d77d4c84f7491ca6e5e0190bec141edaf39..aa4bda1099a8f0c9ad4300f122c8b0c13a9984a8 100644
--- a/src/mapleall/maple_be/src/cg/aarch64/aarch64_peep.cpp
+++ b/src/mapleall/maple_be/src/cg/aarch64/aarch64_peep.cpp
@@ -2500,6 +2500,11 @@ std::vector<Insn*> CombineContiLoadAndStorePattern::FindPrevStrLdr(Insn &insn, r
         }
       }
     }
+    /* do not optimize across mem opnd that is already split */
+    if (curInsn->IsLoadStorePair() &&
+        static_cast<RegOperand*>(static_cast<MemOperand*>(curInsn->GetMemOpnd())->GetBaseRegister())->GetRegisterNumber() == R16) {
+      return prevContiInsns;
+    }
     /* check insn that changes the data flow */
     regno_t stackBaseRegNO = cgFunc->UseFP() ? R29 : RSP;
     /* ldr x8, [x21, #8]