为了消除解释的高性能代价，JIT编译器选择将频繁执行的代码直接转换为CPU的本地指令。

To eliminate interpretation's high performance cost, a JIT compiler selects frequently executed code to be translated directly to the CPU's native instructions.

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另外，如果希望使用某条特定指令而不希望编译器来选择指令，那么可以使用specific intrinsic来执行几乎所有的非分支指令。

In addition, if you want a specific instruction rather than having the compiler choose one, you can perform almost any non-branching instruction with the specific intrinsics.

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TS(跟踪选择，Trace Selection)，每当样式表伪指令执行select操作以从源文档检索数据时就生成一条消息。

TS (Trace Selections) produces a message each time a stylesheet directive performs a select operation to retrieve data from the source document.

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