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This research aims to showcase the egg library as an effective tool for implementing e-graphs and equality saturation in program optimization.

egg: Fast and Extensible Equality Saturation

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This research aims to showcase the egg library as an effective tool for implementing e-graphs and equality saturation in program optimization.
Developed an open-source library called egg that implements e-graphs and equality saturation techniques.
Provided mechanisms for users to define their own languages and analyses through an accessible API.
Incorporated advanced techniques like e-class analysis and deferred invariant restoration for efficient rewriting.
Egg is utilized in hundreds of projects across various domains for program optimization and verification.
Enables users to inspect and manipulate e-graphs directly, leading to enhanced flexibility in program analyses.
Demonstrated improvements in efficiency by reducing traditional rewriting issues through equality saturation.

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Library enables fast program optimization using e-graphs and equality saturation, suggesting simpler code improvement.

Willsey et al. (2026) studied this question.

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