diff --git a/dbms/src/Flash/Coprocessor/TiDBColumn.cpp b/dbms/src/Flash/Coprocessor/TiDBColumn.cpp
index 7183374a5c1..b8501c02b55 100644
--- a/dbms/src/Flash/Coprocessor/TiDBColumn.cpp
+++ b/dbms/src/Flash/Coprocessor/TiDBColumn.cpp
@@ -28,7 +28,7 @@ template <typename T>
 void encodeLittleEndian(const T & value, WriteBuffer & ss)
 {
     auto v = toLittleEndian(value);
-    ss.write(reinterpret_cast<const char *>(&v), sizeof(v));
+    ss.template writeFixed<T>(&v);
 }
 
 TiDBColumn::TiDBColumn(Int8 element_len_)
diff --git a/dbms/src/IO/WriteBuffer.h b/dbms/src/IO/WriteBuffer.h
index 361081d1176..0c0fa2cb545 100644
--- a/dbms/src/IO/WriteBuffer.h
+++ b/dbms/src/IO/WriteBuffer.h
@@ -96,6 +96,24 @@ class WriteBuffer : public BufferBase
         }
     }
 
+    template <class T>
+    __attribute__((always_inline)) void writeFixed(const T * __restrict from)
+    {
+        if (likely(working_buffer.end() - pos >= static_cast<ptrdiff_t>(sizeof(T))))
+        {
+            tiflash_compiler_builtin_memcpy(pos, from, sizeof(T));
+            pos += sizeof(T);
+        }
+        else
+        {
+            [&]() __attribute__((noinline))
+            {
+                write(reinterpret_cast<const char *>(from), sizeof(T));
+            }
+            ();
+        }
+    }
+
 
     inline void write(char x)
     {