diff --git a/src/mapleall/maple_be/include/cg/cg_option.h b/src/mapleall/maple_be/include/cg/cg_option.h
index 551f2f3bbaf334541e01de4bb29b5a59412c6877..cfe1163b18d1ebb1bc9106ca78a0e6d199afd28e 100644
--- a/src/mapleall/maple_be/include/cg/cg_option.h
+++ b/src/mapleall/maple_be/include/cg/cg_option.h
@@ -119,7 +119,7 @@ class CGOptions : public MapleDriverOptionBase {
    * Generate yieldpoints for GC.
    * Do not generate separate GCTIB file.
    */
-  static const GenerateFlag kDefaultGflags = GenerateFlag(kGrootList | kPrimorList);
+  static const GenerateFlag kDefaultGflags = GenerateFlag(0);
 
  public:
   static CGOptions &GetInstance();
diff --git a/src/mapleall/maple_be/src/cg/aarch64/aarch64_cgfunc.cpp b/src/mapleall/maple_be/src/cg/aarch64/aarch64_cgfunc.cpp
index c2d81537b43f9e180316dfe0e4fd398d472bc68f..d41f22a76ac0a2db19e584335dcfbfa335539828 100644
--- a/src/mapleall/maple_be/src/cg/aarch64/aarch64_cgfunc.cpp
+++ b/src/mapleall/maple_be/src/cg/aarch64/aarch64_cgfunc.cpp
@@ -3664,9 +3664,13 @@ Operand *AArch64CGFunc::SelectMalloc(UnaryNode &node, Operand &opnd0) {
   opndVec.emplace_back(&opnd0);
   /* Use calloc to make sure allocated memory is zero-initialized */
   const std::string &funcName = "calloc";
-  Operand &opnd1 = CreateImmOperand(1, PTY_u32, false);
+  PrimType srcPty = PTY_u64;
+  if (opnd0.GetSize() <= k32BitSize) {
+    srcPty = PTY_u32;
+  }
+  Operand &opnd1 = CreateImmOperand(1, srcPty, false);
   opndVec.emplace_back(&opnd1);
-  SelectLibCall(funcName, opndVec, PTY_u32, retType);
+  SelectLibCall(funcName, opndVec, srcPty, retType);
   return &resOpnd;
 }
 
diff --git a/src/mapleall/maple_be/src/cg/cg_option.cpp b/src/mapleall/maple_be/src/cg/cg_option.cpp
index 8f0d8ba721a825ad2b2269917b703db40836cdce..70c8e346849afe67f48449e10c00936a1b7f0c5c 100644
--- a/src/mapleall/maple_be/src/cg/cg_option.cpp
+++ b/src/mapleall/maple_be/src/cg/cg_option.cpp
@@ -1095,7 +1095,7 @@ void CGOptions::ParseCyclePattern(const std::string &fileName) {
 /* Set default options according to different languages. */
 void CGOptions::SetDefaultOptions(const maple::MIRModule &mod) {
   if (mod.IsJavaModule()) {
-    generateFlag = generateFlag | kGenYieldPoint | kGenLocalRc;
+    generateFlag = generateFlag | kGenYieldPoint | kGenLocalRc | kGrootList | kPrimorList;
   }
   insertYieldPoint = GenYieldPoint();
 }
diff --git a/src/mapleall/maple_be/src/cg/cgfunc.cpp b/src/mapleall/maple_be/src/cg/cgfunc.cpp
index 5600f7453655a3eb445095d4aeed7af40862fba3..fe238da768136f30d45044e6699ad79b2b54c435 100644
--- a/src/mapleall/maple_be/src/cg/cgfunc.cpp
+++ b/src/mapleall/maple_be/src/cg/cgfunc.cpp
@@ -538,7 +538,11 @@ void HandleDassign(StmtNode &stmt, CGFunc &cgFunc) {
   ASSERT(dassignNode.GetOpCode() == OP_dassign, "expect dassign");
   BaseNode *rhs = dassignNode.GetRHS();
   ASSERT(rhs != nullptr, "get rhs of dassignNode failed");
-  if (rhs->GetPrimType() == PTY_agg) {
+  if (rhs->GetOpCode() == OP_malloc || rhs->GetOpCode() == OP_alloca) {
+    UnaryStmtNode &uNode = static_cast<UnaryStmtNode &>(stmt);
+    Operand *opnd0 = cgFunc.HandleExpr(dassignNode, *(uNode.Opnd()));
+    cgFunc.SelectDassign(dassignNode, *opnd0);
+  } else if (rhs->GetPrimType() == PTY_agg) {
     cgFunc.SelectAggDassign(dassignNode);
     return;
   }