如果你不使用Clang 3.0（rc）或trunk，你可能正在使用较慢的代码。这最近已经工作，由于不可接受的性能，所以只是更新Clang可能会给你所需的提升。

If you're not using Clang 3.0 (rc) or trunk, you may be using slower code. This has recently been worked on, due to inacceptable performance, so just updating Clang might give you the boost you need.