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Equality saturation has moved beyond the original egg project

blog.sigplan.org 8 min read Editor score 7/10

The post surveys newer approaches to equality saturation, which stores equivalent programs in e-graphs for optimization, and notes that some are more useful or efficient than egg. Compiler and optimizer engineers can use the overview to track the technique's evolution.

What

Equality saturation optimizes programs by storing and rewriting large equivalence classes in an e-graph.

How

E-graphs represent equivalence relations over terms; equality saturation uses non-destructive rewriting, giving up completeness for flexibility.

Why it matters

For program-optimization engineers, newer work seeks more useful or efficient approaches as egg has been superseded.

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