Editing Common Intermediate Language (section)

==Execution==

===Just-in-time compilation===
[[Just-in-time compilation]] (JIT) involves turning the byte-code into code immediately executable by the CPU. The conversion is performed gradually during the program's execution. JIT compilation provides environment-specific optimization, runtime [[type safety]], and assembly verification. To accomplish this, the JIT compiler examines the assembly metadata for any illegal accesses and handles violations appropriately.

===Ahead-of-time compilation===
[[Common Language Infrastructure|CLI]]-compatible execution environments also come with the option to do an [[Ahead-of-time compilation]] (AOT) of an assembly to make it execute faster by removing the JIT process at runtime.

In the [[.NET Framework]] there is a special tool called the [[Native Image Generator]] (NGEN) that performs the AOT. A different approach for AOT is [[CoreRT]] that allows the compilation of .Net Core code to a single executable with no dependency on a runtime. In [[Mono (programming)|Mono]] there is also an option to do an AOT.