How to check the type of gimple

["wang tom via gcc-help" <gcc-help@xxxxxxxxxxx>]

Hello,
I want to write a function in pass to check basic block is POINTER_TYPE or not.Here is my code:>unsigned int>find_pointer (function *fun)>{> basic_block bb;>  gimple_stmt_iterator gsi;
>  FOR_EACH_BB_FN(bb,cfun)>  {>    for (gsi = gsi_start_bb(bb); ! gsi_end_p(gsi); gsi_next(&gsi))>    {>      gimple *stmt = gsi_stmt (gsi);>      stmt = gsi_stmt (gsi);>     if (TREE_CODE(stmt)==POINTER_TYPE)>  >     fprintf(stderr, "find pointer\n");                    >    }>  }...
But it seems that using TREE_CODE with gimple is not correct.Can you give some advice?
Thank you