diff --git a/src/ir/passes/LoopUnroll.cpp b/src/ir/passes/LoopUnroll.cpp
index 21ec1dc1..8c1fceb4 100644
--- a/src/ir/passes/LoopUnroll.cpp
+++ b/src/ir/passes/LoopUnroll.cpp
@@ -122,6 +122,11 @@ static std::unique_ptr<Instruction> CloneInstruction(
       return std::make_unique<CastInst>(op, inst->GetType(),
                                         map(cast->GetOperandValue()), ctx.NextTemp());
     }
+    case Opcode::SIToFP: case Opcode::FPToSI: {
+      auto* cast = static_cast<CastInst*>(inst);
+      return std::make_unique<CastInst>(op, inst->GetType(),
+                                        map(cast->GetOperandValue()), ctx.NextTemp());
+    }
     case Opcode::Br: {
       auto* br = static_cast<BranchInst*>(inst);
       return std::make_unique<BranchInst>(inst->GetType(), br->GetTarget());
@@ -223,6 +228,8 @@ void RunLoopUnroll(Module& module) {
   int unrolled = 0;
   for (auto& func : module.GetFunctions()) {
     if (func->IsExternal()) continue;
+    // 只处理 i32 返回值函数（float 循环体含不支持克隆的操作）
+    if (!func->GetType()->IsInt32()) continue;
     bool changed = true;
     while (changed) {
       changed = false;