An Ahead-of-Time (AOT) compiler is a compiler that implements Ahead of Time Compilation. This refers to the act of compiling an intermediate language, such as Java bytecode, .NET Common Intermediate Language (CIL), or IBM System/38 or IBM System i "Technology Independent Machine Interface" code, into a system-dependent binary.
Most languages with a managed runtime that can be compiled to an intermediate language take advantage of Just-In-Time (JIT). This, briefly, compiles intermediate code into binary code for a native run while the intermediate code is executing, which may decrease an application's performance. Ahead of time compilation eliminates the need for this step by performing the compilation before execution rather than during execution.
See also
- SharpOS AOT (CIL)
- IL2CPU (CIL)
- GNU Compiler for Java
- Excelsior JET (Java)
External links
.NET:
- Speed: NGen Revs Up Your Performance with Powerful New Features -- MSDN Magazine, April 2005
- Mono AOT
Java:
- Excelsior JET -- Java SE 6 Implementation with AOT compiler
- GNU Compiler for Java
- Aonix PERC Ultra
- Real-time Java, Part 2: Comparing compilation techniques -- IBM developerWorks, April 2007
- Improving Swing Performance: JIT vs AOT Compilation -- LinuxWorld Magazine, November 2004
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