diff --git a/src/midend/SysYIRGenerator.cpp b/src/midend/SysYIRGenerator.cpp
index d095a97..812bd39 100644
--- a/src/midend/SysYIRGenerator.cpp
+++ b/src/midend/SysYIRGenerator.cpp
@@ -33,6 +33,9 @@ namespace sysy {
 
 Value *SysYIRGenerator::promoteType(Value *value, Type *targetType) {
   //如果是常量则直接返回相应的值
+  if (targetType == nullptr) {
+    return value; // 如果值为空，那就不需要转换
+  }
   ConstantInteger* constInt = dynamic_cast<ConstantInteger *>(value);
   ConstantFloating *constFloat = dynamic_cast<ConstantFloating *>(value);
   if (constInt) {
@@ -385,9 +388,9 @@ Value* SysYIRGenerator::computeExp(SysYParser::ExpContext *ctx, Type* targetType
   BinaryExpLenStack.push_back(0); // 进入新的层次时Push 0
   visitAddExp(ctx->addExp());
 
-  if(targetType == nullptr) {
-    targetType = Type::getIntType(); // 默认目标类型为int
-  }
+  // if(targetType == nullptr) {
+  //   targetType = Type::getIntType(); // 默认目标类型为int
+  // }
 
   compute();
   // 最后一个Value应该是最终结果
@@ -428,9 +431,9 @@ Value* SysYIRGenerator::computeAddExp(SysYParser::AddExpContext *ctx, Type* targ
     visitMulExp(ctx->mulExp(i));
     // BinaryValueStack.push_back(operand);
   }
-  if(targetType == nullptr) {
-    targetType = Type::getIntType(); // 默认目标类型为int
-  }
+  // if(targetType == nullptr) {
+  //   targetType = Type::getIntType(); // 默认目标类型为int
+  // }
   // 根据后缀表达式的逻辑计算
   compute();
   // 最后一个Value应该是最终结果
@@ -1620,13 +1623,13 @@ std::any SysYIRGenerator::visitAddExp(SysYParser::AddExpContext *ctx) {
 }
 
 std::any SysYIRGenerator::visitRelExp(SysYParser::RelExpContext *ctx) {
-  Value* result = computeAddExp(ctx->addExp(0), Type::getIntType());
+  Value* result = computeAddExp(ctx->addExp(0));
 
   for (int i = 1; i < ctx->addExp().size(); i++) {
     auto opNode = dynamic_cast<antlr4::tree::TerminalNode*>(ctx->children[2*i-1]);
     int opType = opNode->getSymbol()->getType();
 
-    Value* operand = computeAddExp(ctx->addExp(i), Type::getIntType());
+    Value* operand = computeAddExp(ctx->addExp(i));
 
     Type* resultType = result->getType();
     Type* operandType = operand->getType();