本地代码编译器（native code compiler）生成的是面向特定CPU架构（比如x86，x64或IA64）的代码。相反，每个面向CLR的编译器生成的都是IL代码。
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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.
Facebook也使用PHP，但它已经为它建立一个编译器，以便它可以分为本地代码打开了Web服务器，从而提高性能。
Facebook still USES PHP, but it has built a compiler for it so it can be turned into native code on its web servers, thus boosting performance.
程序运行时，JIT编译器选择将最频繁执行的方法编译成本地代码。
JIT compilers selectively compile the most frequently executing methods to native code while programs are running.
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