SIL for First Time Learners
summary
SIL is Swift’s language-specific intermediate representation that sits between AST and LLVM IR and shows concrete transformations like removes unused local stores, converts local variables into direct returns under -O, and annotates optimized instructions with changed constants. The examples emit raw SIL then optimized SIL so numbers and instructions differ, demonstrating actual optimizer passes and flags (including upcoming Swift 4.1 options), and pointers to the Swift repo and earlier talks give next steps for hands-on investigation.
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chapters (9)
- 0:00Intro
- 1:10Why SIL?
- 2:22Swift Compiler
- 2:51sample.swift
- 3:34Emit SIL with
- 4:30Diff
- 5:13Optimization flag
- 5:29Summary
- 6:11References
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