Recent improvements to the type checker – Swift Compiler

Jun 3, 2026 · 5:52 AM UTC · 0 reactions · 0 comments · 36 views

With the Swift 6.4 release converging, I thought it would be a good time to detail some of the type checker performance improvements we worked on since I shared the type checker performance roadmap last year. I'm also going to outline a couple of things we plan on looking at next. Swift 6.4 The disjunction selection and favoring algorithms in Swift 6.3 allowed us to phase out some older, less principled performance optimizations. The work in Swift 6.4 can be seen as a continuation of this tren...

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Canonical URL	https://forums.swift.org/t/recent-improvements-to-the-type-checker/87048
Publication time	Wed, 03 Jun 2026 05:52:04 +0000
Retrieval time	2026-06-03T06:11:56.795Z
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