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1. Commits on Sep 30, 2026

   • gh-158380: Fix the stack operand used by JIT dict access guards (GH-158381)

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2. Commits on Sep 11, 2026

   • gh-157247: Block perf trampoline activation when the main interpreter's JIT is enabled (#157258)

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3. Commits on Aug 13, 2026

   • gh-154701: prevent executor self-links in JIT cold exits (GH-155323)

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4. Commits on May 23, 2026

   • gh-148450: `abc.register` needs to update `type_version` when `tp_flags` is changed (#148623)

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5. Commits on May 21, 2026

   • gh-149358: Generating JIT recorder transformers and stabilizing family layouts (GH-149359)

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   • gh-149335: Avoid JIT trace buffer asserts with overhead above `FITNESS_INITIAL` (GH-149633)

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6. Commits on May 8, 2026

   • gh-149459: Fix segfault when `_LOAD_SPECIAL` guard deoptimizes (#149478)

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7. Commits on Apr 28, 2026

   • gh-148571: [JIT] Preserve family-head recorder layouts for specialized opcode families (GH-148730)

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8. Commits on Apr 24, 2026

   • gh-146073: Add fitness/exit quality mechanism for JIT trace frontend (GH-148089)

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9. Commits on Apr 14, 2026

   • gh-148378: Allow multiple consecutive recording ops per macro op (GH-148496)

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10. Commits on Apr 3, 2026

    • gh-146073: Add fitness/exit quality mechanism for JIT trace frontend (GH-147966)

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11. Commits on Mar 18, 2026

    • gh-144888: JIT executor bloom filter wide-type optimization and function Inlining (GH-146114)

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12. Commits on Mar 16, 2026

    • gh-144888: Replace bloom filter linked lists with continuous arrays to optimize executor invalidating performance (GH-145873)

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13. Commits on Mar 11, 2026

    • gh-144540: Add _MAKE_HEAP_SAFE uop to eliminate unnecessary refcount operations in RETURN_VALUE and YIELD_VALUE (GH-144414)

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14. Commits on Mar 10, 2026

    • gh-144681: Fix JIT trace builder assertion failure when conditional branch jump target coincides with fallthrough target (GH-144742)

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15. Commits on Mar 2, 2026

    • gh-144569: Avoid creating temporary objects in `BINARY_SLICE` for list, tuple, and unicode (GH-144590)

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16. Commits on Feb 25, 2026

    • gh-145197: Fix JIT trace crash when recording function from cleared generator frame (GH-145220)

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17. Commits on Feb 22, 2026

    • gh-145064: Fix JIT assertion failure during CALL_ALLOC_AND_ENTER_INIT side exit (GH-145100)

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18. Commits on Feb 9, 2026

    • gh-144623: Fix missing output uops in optimizer debug output (GH-144617)

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19. Commits on Feb 2, 2026

    • gh-139109: Replace `_CHECK_STACK_SPACE` with `_CHECK_STACK_SPACE_OPERAND` in JIT optiimizer (GH-144394)

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    • gh-144145: Revert PR#144122 for performance and potential bugs. (GH-144391)

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20. Commits on Jan 30, 2026

    • gh-144145: Track nullness of properties in the Tier 2 JIT optimizer (GH-144122)

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21. Commits on Jan 29, 2026

    • gh-143946: Add more debug info in `optimize_uops` (GH-144262)

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22. Commits on Jan 24, 2026

    • gh-144068: fix JIT tracer memory leak when daemon thread exits (GH-144077)

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23. Commits on Jan 17, 2026

    • gh-143421: Use new buffer to save optimized uops (GH-143682)

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    • gh-143946: Show `JitOptSymbol` on abstract stack when set PYTHON_OPT_DEBUG > 4 (GH-143957)

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    • gh-143943: add missing header file for `pycore_optimizer_types.h` (GH-143947)

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24. Commits on Jan 14, 2026

    • gh-138050: Use cold flag instead of warm flag in `MAKE_WARM` (GH-143827)

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25. Commits on Jan 8, 2026

    • gh-143421: Move `JitOptContext` from stack allocation to per-thread heap allocation (GH-143536)

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26. Commits on Dec 26, 2025

    • gh-134584: Eliminate redundant refcounting from `IS_OP` (GH-143171)

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    • gh-134584: Eliminate redundant refcounting from `_COMPARE_OP_X` (GH-143186)

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27. Commits on Dec 23, 2025

    • gh-134584: Eliminate redundant refcounting from `_BINARY_OP_SUBSCR_TUPLE_INT` (GH-143094)

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    • gh-134584: Eliminate redundant refcounting from `_LOAD_ATTR_WITH_HINT` (GH-143062)

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28. Commits on Dec 20, 2025

    • gh-142834: pdb commands command should use last available breakpoint (#142835)

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29. Commits on Dec 18, 2025

    • gh-134584: Eliminate redundant refcounting from _BINARY_OP_SUBSCR_LIST_INT (GH-142926)

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