请问string.find无法jit，怎样修改？

[ty javac]

nginx version: openresty/1.9.15.1

LuaJIT 2.1.0-beta2 -- Copyright (C) 2005-2016 Mike Pall. http://luajit.org/

lua代码：

 1 function explode ( _str,seperator )

  2     local pos, arr = 0, {}

  3         for st, sp in function() return string.find( _str, seperator, pos, true     ) end do

  4             table.insert( arr, string.sub( _str, pos, st-1 ) )

  5             pos = sp + 1

  6         end

  7     table.insert( arr, string.sub( _str, pos ) )

  8     return arr

  9 end

函数调用时，seperator为普通字符，看http://wiki.luajit.org/NYI#libraries_string-library ：

string.find

2.1 partial

Only fixed string searches (no patterns).

/tmp/jit.log:
[TRACE --- imgresize.lua:1 -- NYI: bytecode 51 at imgresize.lua:3]

[TRACE --- imgresize.lua:3 -- leaving loop in root trace]

[TRACE --- imgresize.lua:1 -- NYI: bytecode 51 at imgresize.lua:9]

[TRACE --- imgresize.lua:1 -- NYI: bytecode 51 at imgresize.lua:3]

[TRACE --- imgresize.lua:1 -- NYI: bytecode 51 at imgresize.lua:9]

[TRACE --- imgresize.lua:3 -- leaving loop in root trace]

./luajit/bin/luajit nginx/lua/ljbc.lua 51

opcode 51:

FNEW

[DeJiang Zhu]

额

你是如何判断是 string.find 无法 jit 的呢

opcode 51: FNEW，是指的：function()  end

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