gaul

Summary

gaul's work sits entirely in JSC, concentrated on ARM64 instruction selection in the baseline JIT: collapsing adjacent metadata pointer loads into a single `ldp`, rewriting zero-immediate `add`/`sub` as `mov`, and folding unsigned compares against zero into `cbz`/`cbnz`. The pattern is peephole codegen micro-optimization rather than vulnerability fixing — even the hardening-flagged commit is a load-pairing change, not a mitigation. Where to look next: the megamorphic cache commit, which folds the StringImpl hash shift into the cache's hash add. Arithmetic rewrites in inline cache hash computation sit directly on lookup correctness, and the surrounding baseline metadata-load changes touch the same emission paths.

Components

Security Fix History

• No security fixes recorded

Hardening Commits

• 2026-08-26 [JSC] Baseline: load adjacent metadata pointer fields with a single ldp

Recent Commits

• 2026-08-26 [JSC] Baseline: load adjacent metadata pointer fields with a single ldp
• 2026-08-26 [JSC] add/sub of a zero immediate should be a mov
• 2026-08-25 [JSC] Fold the string-impl hash shift into the megamorphic cache hash add
• 2026-08-25 [JSC] Fold unsigned compares against zero into cbz/cbnz and test