diff --git a/lib/core/LLVMCG/StructGen.py b/lib/core/LLVMCG/StructGen.py
index 865045f..97e994a 100644
--- a/lib/core/LLVMCG/StructGen.py
+++ b/lib/core/LLVMCG/StructGen.py
@@ -202,13 +202,16 @@ class StructGenMixin:
                 insert_pos = header_end
             struct_block: str = '\n'.join(struct_defs) + '\n'
             ir_text = ir_text[:insert_pos + 1] + struct_block + ir_text[insert_pos + 1:]
-        for name in struct_names:
-            if name[0].isdigit() or '.' in name:
-                ir_text = re.sub(
-                    r'%' + re.escape(name) + r'(?=[^a-zA-Z0-9_$\.]|$)',
-                    r'%"' + name + r'"',
-                    ir_text
-                )
+        # 仅含特殊字符（数字开头或含点）的 struct 名需要加引号：
+        # 合并为单个正则一次扫描全文本，替代逐 name 各自 re.sub（每个 name
+        # 一次 O(text) 扫描）。lookahead 边界排除保证各备选互斥，语义等价。
+        special_names: list[str] = [n for n in struct_names if n[0].isdigit() or '.' in n]
+        if special_names:
+            ir_text = re.sub(
+                r'%(' + '|'.join(re.escape(n) for n in special_names) + r')(?=[^a-zA-Z0-9_$\.]|$)',
+                lambda m: r'%"' + m.group(1) + r'"',
+                ir_text
+            )
 
         return ir_text