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1. Commits on Oct 16, 2026

   • [JSC] DFG backwards propagation should not request negative zero for the operand of `Branch`

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     sosukesuzuki

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   • [JSC] `TypedArraySet` intrinsic should not be used again after an `Uncountable` exit

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     sosukesuzuki

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   • [JSC] Allocate property storage of arrays without C++ operation call

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     sosukesuzuki

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2. Commits on Oct 15, 2026

   • [JSC] LLInt should not poll the JIT worklist on every execution while a baseline compile is in flight

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     Constellation

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   • [JSC] Add DFG / FTL intrinsic for `%TypedArray%.prototype.set`

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     sosukesuzuki

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   • [JSC] DFG iterator open fast paths should pass `JSTypeRange` to `IsCellWithType`

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     sosukesuzuki

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   • [JSC] Improve B3 FixSSA by tracking reachable defs

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     Constellation

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3. Commits on Oct 14, 2026

   • [JSC] Install approximate FTL bytecode cost sooner

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     Constellation

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   • [JSC] TypedArray / ArrayBuffer constructions throw range error for negative length

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   • [JSC] DFG should not turn a call to RegExp into NewRegExpUntyped

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     Constellation

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4. Commits on Oct 13, 2026

   • [JSC] DFG should branch on op_instanceof result in each arm when jtrue / jfalse follows

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     Constellation

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   • [JSC] DFG backwards propagation should not pass LogicalNot's use flags to its operand

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     Constellation

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   • [JSC] DFG backwards propagation should bound right shifts by their masked shift count

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     Constellation

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   • Remove ShadowRealm

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     annevk

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   • [JSC] RegExp `String#replace` and `JSON.stringify` should not resolve substring ropes

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     sosukesuzuki

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   • [JSC] PutStackSinkingPhase should compute reaching defs with a single dominator tree walk

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     Constellation

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   • [JSC] DFG BackwardsPropagationPhase should visit only affected blocks

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   • Replace NODELETE with LEGACY_NODELETE in JavaScriptCore

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     rniwa

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   • [Safer CPP] Address new NODELETE warnings after the safer cpp static analysis upgrade

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     cdumez

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5. Commits on Oct 12, 2026

   • [JSC] Use DirectCall when polymorphic inlining fails

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     Constellation

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   • [JSC] JIT Array butterfly allocation should follow to C++ behavior

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6. Commits on Oct 11, 2026

   • [JSC] DFG backwards propagation should not treat non-integer constants as within power of two

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     sosukesuzuki

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   • [JSC] TypeCheckHoisting should not hoist a monomorphic CheckStructure over a polymorphic access

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7. Commits on Oct 9, 2026

   • [JSC] MovHint removal should apply the block-terminal liveness rule only to phantom allocations

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     Constellation

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   • [JSC] Inline the double case of Number.isNaN, Number.isFinite, and Number.isSafeInteger

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     Constellation

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8. Commits on Oct 8, 2026

   • [JSC] Centralize cross-realm check when inlining intrinsics in DFG

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     syg

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   • [JSC] `Symbol::privateName()` should not copy `PrivateName`

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     sosukesuzuki

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   • [JSC] DFG / FTL `StringIteratorNext` should inline Latin-1 characters in 16-bit strings

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     sosukesuzuki

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9. Commits on Oct 7, 2026

   • [JSC] Read Object.defineProperty descriptor fields after ToPropertyKey

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     chicoxyzzy

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10. Commits on Oct 6, 2026

    • [JSC] Remove CodeBlock::m_shouldAlwaysBeInlined

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      Andrew-Fryer

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11. Commits on Oct 5, 2026

    • DFG makeSafe should read arith profile for ValueSub too

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      justinmichaud

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    • [JSC] Compare lengths inline before calling `operationCompareStringEq` for ropes

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      sosukesuzuki

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12. Commits on Oct 4, 2026

    • [JSC] Reorder CheckStructure targets

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      Constellation

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13. Commits on Oct 3, 2026

    • [JSC] Use the right realm in ArrayBuffer constructor in DFG

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      syg

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14. Commits on Sep 30, 2026

    • [JSC] Don't visit CFA-unreachable blocks in ConstantFoldingPhase

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      syg

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