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Commits on Mar 29, 2026

• [JSC] Introduce butterfly-less objects

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Commits on Mar 28, 2026

• [JSC] testair: remove redundant #if

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• [JSC] Fix testair and testb3 crashes under USE(PROTECTED_JIT) by adding ArenaLifetime to test threads

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• [JSC] Reduce size of Wasm GC objects by dropping m_rtt

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Commits on Mar 27, 2026

• [JSC] IndexMap::resize should not overwrite existing elements

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• [JSC] Introduce Realm-less Objects

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Commits on Mar 26, 2026

• Adopt C++20's std::popcount()

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Commits on Mar 25, 2026

• [JSC] GreedyRegAlloc: use Invocable consistently

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• [JSC] GreedyRegAlloc: cleanup coalescables list management

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• [JSC] testair: skip testZDefOfSpillSlotWithOffsetNeedingToBeMaterializedInARegister when B3OptLevel is 1

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Commits on Mar 24, 2026

• Add wasm multimemory support to base instructions

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Commits on Mar 23, 2026

• [JSC] Reduce strength for below / above with 0 / 1

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Commits on Mar 21, 2026

• [JSC] Improve worst case performance of Air stack allocation

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Commits on Mar 19, 2026

• [JSC] Use wasm SIMD optimizations in x64 too

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Commits on Mar 17, 2026

• [JSC] Rewrite of the greedy register allocator's coalescing strategy

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Commits on Mar 16, 2026

• [JSC] Move B3ReduceSIMDShuffle to B3ReduceStrength for now

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• [JSC] Optimize B3 SIMD shuffle more

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• [JSC] Add more SIMD lowering

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Commits on Mar 15, 2026

• [JSC] Use simple ARM64 shl, ushr, sshr

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Commits on Mar 14, 2026

• [JSC] Implement SIMD Shuffle reduction

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Commits on Mar 9, 2026

• [JSC] Optimize Double Mod in DFG / FTL

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• Adopt LIFETIME_BOUND in more places in JavaScriptCore

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Commits on Mar 5, 2026

• Unreviewed, relanding with TestWTF fix

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Commits on Mar 4, 2026

• Unreviewed, reverting 308594@main (6904c3f73213)

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• [WTF] SmallSet should take HashTraits

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Commits on Mar 1, 2026

• [JSC] Unsound optimization in ReduceStrength regarding Int52-to-Int32 conversion pattern

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Commits on Feb 28, 2026

• Make assorted class members const Ref[Ptr] in JavaScriptCore

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Commits on Feb 23, 2026

• [JSC] Merge RegisterSetBuilder into RegisterSet

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Commits on Feb 19, 2026

• [JSC] Respect shouldNegate() on WasmRefTypeCheckValue nodes in OMG

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• [JSC] GreedyRegAlloc: remove groupForSpill call when traversing instructions

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• Adopt `NODELETE` annotation in more places in JavaScriptCore/

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• [JSC] Add FP Mul / Div strength reductions

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Commits on Feb 18, 2026

• [JSC] Support fccmp in B3

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Commits on Feb 17, 2026

• [JSC] Air Greedy Register Allocator should handle FP constants

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Commits on Feb 16, 2026

• [JSC] GreedyRegAlloc: memoize the spill slot

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