diff --git a/src/mapleall/maple_be/include/cg/cgfunc.h b/src/mapleall/maple_be/include/cg/cgfunc.h
index b678bf79e4e626a785d85bd043dfc58b30ceba42..d5707e66c910c239e45ed001d20c2bbcd1cf8bae 100644
--- a/src/mapleall/maple_be/include/cg/cgfunc.h
+++ b/src/mapleall/maple_be/include/cg/cgfunc.h
@@ -81,6 +81,7 @@ class SpillMemOperandSet {
 class LiveRange;
 #endif  /* TARGARM32 */
 constexpr uint32 kVRegisterNumber = 80;
+constexpr uint32 kNumBBOptReturn = 30;
 class CGFunc {
  public:
   enum ShiftDirection : uint8 {
diff --git a/src/mapleall/maple_be/src/cg/aarch64/aarch64_color_ra.cpp b/src/mapleall/maple_be/src/cg/aarch64/aarch64_color_ra.cpp
index 471819cd1129b1d75d77dc925ef3d7da23192202..62b60fc23361105629c97767d54e772a6fe87f19 100644
--- a/src/mapleall/maple_be/src/cg/aarch64/aarch64_color_ra.cpp
+++ b/src/mapleall/maple_be/src/cg/aarch64/aarch64_color_ra.cpp
@@ -455,14 +455,18 @@ void GraphColorRegAllocator::CalculatePriority(LiveRange &lr) const {
   auto *a64CGFunc = static_cast<AArch64CGFunc*>(cgFunc);
   CG *cg = a64CGFunc->GetCG();
 
-  if (cg->GetRematLevel() >= kRematConst && lr.IsRematerializable(*a64CGFunc, kRematConst)) {
-    lr.SetRematLevel(kRematConst);
-  } else if (cg->GetRematLevel() >= kRematAddr && lr.IsRematerializable(*a64CGFunc, kRematAddr)) {
-    lr.SetRematLevel(kRematAddr);
-  } else if (cg->GetRematLevel() >= kRematDreadLocal && lr.IsRematerializable(*a64CGFunc, kRematDreadLocal)) {
-    lr.SetRematLevel(kRematDreadLocal);
-  } else if (cg->GetRematLevel() >= kRematDreadGlobal && lr.IsRematerializable(*a64CGFunc, kRematDreadGlobal)) {
-    lr.SetRematLevel(kRematDreadGlobal);
+  if (cgFunc->GetCG()->IsLmbc()) {
+    lr.SetRematLevel(kRematOff);
+  } else {
+    if (cg->GetRematLevel() >= kRematConst && lr.IsRematerializable(*a64CGFunc, kRematConst)) {
+      lr.SetRematLevel(kRematConst);
+    } else if (cg->GetRematLevel() >= kRematAddr && lr.IsRematerializable(*a64CGFunc, kRematAddr)) {
+      lr.SetRematLevel(kRematAddr);
+    } else if (cg->GetRematLevel() >= kRematDreadLocal && lr.IsRematerializable(*a64CGFunc, kRematDreadLocal)) {
+      lr.SetRematLevel(kRematDreadLocal);
+    } else if (cg->GetRematLevel() >= kRematDreadGlobal && lr.IsRematerializable(*a64CGFunc, kRematDreadGlobal)) {
+      lr.SetRematLevel(kRematDreadGlobal);
+    }
   }
 
   auto calculatePriorityFunc = [&lr, &bbNum, &numDefs, &numUses, &pri, this] (uint32 bbID) {
diff --git a/src/mapleall/maple_be/src/cg/cgbb.cpp b/src/mapleall/maple_be/src/cg/cgbb.cpp
index 502983b519e5c61e91cf0bbaa3bf7a1194ec73be..d8b5e862787bc9d5af187b7a01e8273b7eea6fb0 100644
--- a/src/mapleall/maple_be/src/cg/cgbb.cpp
+++ b/src/mapleall/maple_be/src/cg/cgbb.cpp
@@ -525,6 +525,7 @@ void Bfs::ComputeBlockOrder() {
         done = true;
       } else {
         LogInfo::MapleLogger() << "Error: RA BFS loop " << sortedCnt << " in func " << cgfunc->GetName() << "\n";
+        CHECK_FATAL(false, "");
       }
     }
     sortedCnt = sortedBBs.size();
diff --git a/src/mapleall/maple_be/src/cg/cgfunc.cpp b/src/mapleall/maple_be/src/cg/cgfunc.cpp
index 788a763a8e258d517b60cee902a55894f07e5f3d..c31731265a9a846d9c24886eb3889268110624e2 100644
--- a/src/mapleall/maple_be/src/cg/cgfunc.cpp
+++ b/src/mapleall/maple_be/src/cg/cgfunc.cpp
@@ -2074,7 +2074,8 @@ void CGFunc::HandleFunction() {
   /* select instruction */
   GenerateInstruction();
   /* merge multi return */
-  if (!func.GetModule()->IsCModule() || CGOptions::DoRetMerge() || CGOptions::OptimizeForSize()) {
+  if (!func.GetModule()->IsCModule() || (func.GetModule()->IsCModule() && (NumBBs() < kNumBBOptReturn)) ||
+      CGOptions::DoRetMerge() || CGOptions::OptimizeForSize()) {
     MergeReturn();
   }
   if (func.IsJava()) {