Learn LLVM 17 by Kai Nacke and Amy Kwan

Author:Kai Nacke and Amy Kwan
Language: eng
Format: epub, mobi
Publisher: Packt Publishing Ltd.
Published: 2023-12-27T00:00:00+00:00

Running extension point callbacks

Because the pass pipeline is not populated for optimization level O0, the registered extension points are not called. If you use the extension points to register passes that should also run at O0 level, this is problematic. You can call the runRegisteredEPCallbacks() method to run the registered extension point callbacks, resulting in a pass manager populated only with the passes that were registered through the extension points.

By adding the optimization pipeline to tinylang, you created an optimizing compiler similar to clang. The LLVM community works on improving the optimizations and the optimization pipeline with each release. Due to this, it is very seldom that the default pipeline is not used. Most often, new passes are added to implement certain semantics of the programming language.

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