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| og:image:alt | Implements unique reference tracking to references in the JIT Optimizer.
Uses the unique reference tracking to eliminate unnecessary reference counting for uniquely referenced tuples. ex:
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JIT: Implement unique reference tracking in Tier 2 for reference count optimizations
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| Merge branch 'main' into branch-unique-reference-tracking | https://github.com/python/cpython/pull/144300/commits/6f66c5609b17d490e486ccf750d36b6913bc831c |
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| Merge branch 'main' into branch-unique-reference-tracking | https://github.com/python/cpython/pull/144300/commits/b2518259b00aa1219ebb1b2e61498c484d3015d5 |
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| January 31, 2026 23:11 | https://github.com/python/cpython/pull/144300#commits-pushed-a0fd9e2 |
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| Change JIT reference tags to 2 bit scheme | https://github.com/python/cpython/pull/144300/commits/a0fd9e2db5ca6b94eeead1fa098939943c18d3d0 |
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View reviewed changes
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| Please reload this page | https://github.com/python/cpython/pull/144300 |
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| February 21, 2026 12:44 | https://github.com/python/cpython/pull/144300#commits-pushed-78978aa |
|
| https://github.com/reidenong |
| Merge branch 'main' into branch-unique-reference-tracking | https://github.com/python/cpython/pull/144300/commits/78978aaf9a06afebaef739da54a43a2dd875526c |
| 78978aa | https://github.com/python/cpython/pull/144300/commits/78978aaf9a06afebaef739da54a43a2dd875526c |
|
| https://github.com/reidenong |
| Regen cases | https://github.com/python/cpython/pull/144300/commits/0b07ac42e8b67d11e2c19d6a8ecf0cd82add8735 |
| 0b07ac4 | https://github.com/python/cpython/pull/144300/commits/0b07ac42e8b67d11e2c19d6a8ecf0cd82add8735 |
|
| https://github.com/reidenong |
| Merge branch 'main' into branch-unique-reference-tracking | https://github.com/python/cpython/pull/144300/commits/14e5d3d58ffb1c2ee2e7ef6598521a3d3fe8886c |
| 14e5d3d | https://github.com/python/cpython/pull/144300/commits/14e5d3d58ffb1c2ee2e7ef6598521a3d3fe8886c |
| https://github.com/reidenong |
| reidenong | https://github.com/reidenong |
| Feb 21, 2026 | https://github.com/python/cpython/pull/144300#issuecomment-3938195493 |
| Please reload this page | https://github.com/python/cpython/pull/144300 |
| https://github.com/apps/bedevere-app |
| bedevere-app | https://github.com/apps/bedevere-app |
|
awaiting change review
| https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22awaiting%20change%20review%22 |
|
awaiting changes
| https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22awaiting%20changes%22 |
| Feb 21, 2026 | https://github.com/python/cpython/pull/144300#event-22965131912 |
| https://github.com/apps/bedevere-app |
| bedevere-app | https://github.com/apps/bedevere-app |
| Feb 21, 2026 | https://github.com/python/cpython/pull/144300#issuecomment-3938195575 |
| @markshannon | https://github.com/markshannon |
| Please reload this page | https://github.com/python/cpython/pull/144300 |
| https://github.com/apps/bedevere-app |
| bedevere-app | https://github.com/apps/bedevere-app |
| markshannon | https://github.com/markshannon |
| February 21, 2026 05:18 | https://github.com/python/cpython/pull/144300#event-22965132393 |
| reidenong | https://github.com/reidenong |
| March 9, 2026 21:31 | https://github.com/python/cpython/pull/144300#commits-pushed-8506038 |
|
| https://github.com/reidenong |
| Merge branch 'main' into branch-unique-reference-tracking | https://github.com/python/cpython/pull/144300/commits/8506038cd35bc0aea69026415a12bfb6fac4ed78 |
| 8506038 | https://github.com/python/cpython/pull/144300/commits/8506038cd35bc0aea69026415a12bfb6fac4ed78 |
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| Regen cases | https://github.com/python/cpython/pull/144300/commits/d67617f0eab5bc8e7568adf642bbb52ee5fc75ef |
| d67617f | https://github.com/python/cpython/pull/144300/commits/d67617f0eab5bc8e7568adf642bbb52ee5fc75ef |
|
| https://github.com/reidenong |
| Merge branch 'main' into branch-unique-reference-tracking | https://github.com/python/cpython/pull/144300/commits/100eeb5b3353cb4d20994621861ac91bc86f4352 |
| 100eeb5 | https://github.com/python/cpython/pull/144300/commits/100eeb5b3353cb4d20994621861ac91bc86f4352 |
| https://github.com/reidenong |
| reidenong | https://github.com/reidenong |
| Mar 9, 2026 | https://github.com/python/cpython/pull/144300#issuecomment-4023842444 |
| @markshannon | https://github.com/markshannon |
| Please reload this page | https://github.com/python/cpython/pull/144300 |
| reidenong | https://github.com/reidenong |
| March 11, 2026 21:30 | https://github.com/python/cpython/pull/144300#commits-pushed-e476061 |
|
| https://github.com/reidenong |
| Merge branch 'main' into branch-unique-reference-tracking | https://github.com/python/cpython/pull/144300/commits/e47606164d329ec0445701debb51b8f24e826bfc |
| e476061 | https://github.com/python/cpython/pull/144300/commits/e47606164d329ec0445701debb51b8f24e826bfc |
|
| https://github.com/reidenong |
| Merge branch 'main' into branch-unique-reference-tracking | https://github.com/python/cpython/pull/144300/commits/06a9ec17c1be5ae9396f0954504ad5094c4a821e |
| 06a9ec1 | https://github.com/python/cpython/pull/144300/commits/06a9ec17c1be5ae9396f0954504ad5094c4a821e |
| https://github.com/markshannon |
| markshannon | https://github.com/markshannon |
|
Mar 13, 2026
| https://github.com/python/cpython/pull/144300#ref-issue-4064868208 |
|
Convert more uops to leave their inputs on the stack to be cleaned up by _POP_TOP
#145866
| https://github.com/python/cpython/issues/145866 |
| https://github.com/Fidget-Spinner |
| Fidget-Spinner | https://github.com/Fidget-Spinner |
| Mar 22, 2026 | https://github.com/python/cpython/pull/144300#issuecomment-4106325237 |
| Please reload this page | https://github.com/python/cpython/pull/144300 |
| @reidenong | https://github.com/reidenong |
| Please reload this page | https://github.com/python/cpython/pull/144300 |
| Fidget-Spinner | https://github.com/Fidget-Spinner |
| March 22, 2026 22:42 | https://github.com/python/cpython/pull/144300#commits-pushed-6bce6b4 |
|
| https://github.com/Fidget-Spinner |
| Merge remote-tracking branch 'upstream/main' into pr/144300 | https://github.com/python/cpython/pull/144300/commits/6bce6b44fbd2934d7e6e9ef5907b5f3af44eccd6 |
| 6bce6b4 | https://github.com/python/cpython/pull/144300/commits/6bce6b44fbd2934d7e6e9ef5907b5f3af44eccd6 |
|
| https://github.com/Fidget-Spinner |
| Mark unique tuple freeing as non-escaping | https://github.com/python/cpython/pull/144300/commits/89dc467e4d0f8f8a25edd7e7fb7113807b4310c4 |
| 89dc467 | https://github.com/python/cpython/pull/144300/commits/89dc467e4d0f8f8a25edd7e7fb7113807b4310c4 |
|
| https://github.com/Fidget-Spinner |
| fix a bugs in _COPY_FREE_VARS and frame creation | https://github.com/python/cpython/pull/144300/commits/4e6c7923eeaf2effd01f564d5083acfed93b03e4 |
| 4e6c792 | https://github.com/python/cpython/pull/144300/commits/4e6c7923eeaf2effd01f564d5083acfed93b03e4 |
| https://github.com/Fidget-Spinner |
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Mar 22, 2026
| https://github.com/python/cpython/pull/144300#pullrequestreview-3988321208 |
|
View reviewed changes
| https://github.com/python/cpython/pull/144300/files/4e6c7923eeaf2effd01f564d5083acfed93b03e4 |
| Fidget-Spinner | https://github.com/Fidget-Spinner |
| https://github.com/python/cpython/pull/144300#pullrequestreview-3988321208 |
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| Please reload this page | https://github.com/python/cpython/pull/144300 |
| https://github.com/apps/bedevere-app |
| bedevere-app | https://github.com/apps/bedevere-app |
|
awaiting merge
| https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22awaiting%20merge%22 |
|
awaiting change review
| https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22awaiting%20change%20review%22 |
| Mar 22, 2026 | https://github.com/python/cpython/pull/144300#event-23792764035 |
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| Fidget-Spinner | https://github.com/Fidget-Spinner |
| markshannon | https://github.com/markshannon |
| stale review | https://github.com/python/cpython/pull/144300#pullrequestreview-3831441042 |
| March 22, 2026 16:56 | https://github.com/python/cpython/pull/144300#event-23792767452 |
| https://github.com/Fidget-Spinner |
| Fidget-Spinner | https://github.com/Fidget-Spinner |
| e36f8db | https://github.com/python/cpython/commit/e36f8db7e5493b242c41acea3ac189de7edcae4a |
| Mar 22, 2026 | https://github.com/python/cpython/pull/144300#event-23792771137 |
| Please reload this page | https://github.com/python/cpython/pull/144300 |
| https://github.com/apps/bedevere-app |
| bedevere-app | https://github.com/apps/bedevere-app |
|
awaiting merge
| https://github.com/python/cpython/issues?q=state%3Aopen%20label%3A%22awaiting%20merge%22 |
| Mar 22, 2026 | https://github.com/python/cpython/pull/144300#event-23792771553 |
| https://github.com/eendebakpt |
| eendebakpt | https://github.com/eendebakpt |
|
Mar 22, 2026
| https://github.com/python/cpython/pull/144300#ref-issue-4116944443 |
|
Optimize float operations by mutating uniquely-referenced operands in place (JIT only)
#146306
| https://github.com/python/cpython/issues/146306 |
| CuriousLearner | https://github.com/CuriousLearner |
|
Mar 23, 2026
| https://github.com/python/cpython/pull/144300#ref-commit-3e05fa3 |
|
| https://github.com/CuriousLearner |
| Merge branch 'main' of github.com:python/cpython into fix- | https://github.com/CuriousLearner/cpython/commit/3e05fa35e0562de54252dab4d09da002fc358393 |
| pythongh-13… | https://github.com/python/cpython/issues/138577 |
| 3e05fa3 | https://github.com/CuriousLearner/cpython/commit/3e05fa35e0562de54252dab4d09da002fc358393 |
| …8577 | https://github.com/python/cpython/issues/138577 |
| pythongh-146197 | https://github.com/python/cpython/issues/146197 |
| python#146332 | https://github.com/python/cpython/pull/146332 |
| pythongh-146325 | https://github.com/python/cpython/issues/146325 |
| python#146330 | https://github.com/python/cpython/pull/146330 |
| pythongh-146197 | https://github.com/python/cpython/issues/146197 |
| python#146198 | https://github.com/python/cpython/pull/146198 |
| pythongh-143387 | https://github.com/python/cpython/issues/143387 |
| python#146234 | https://github.com/python/cpython/pull/146234 |
| pythongh-108907 | https://github.com/python/cpython/issues/108907 |
| pythonGH-145837 | https://github.com/python/cpython/pull/145837 |
| pythongh-146175 | https://github.com/python/cpython/issues/146175 |
| pythonGH-146178 | https://github.com/python/cpython/pull/146178 |
| pythongh-146056 | https://github.com/python/cpython/issues/146056 |
| python#146167 | https://github.com/python/cpython/pull/146167 |
| python#146276 | https://github.com/python/cpython/pull/146276 |
| pythongh-145264 | https://github.com/python/cpython/issues/145264 |
| pythonGH-145267 | https://github.com/python/cpython/pull/145267 |
| pythongh-146308 | https://github.com/python/cpython/issues/146308 |
| python#146309 | https://github.com/python/cpython/pull/146309 |
| pythongh-146192 | https://github.com/python/cpython/issues/146192 |
| pythonGH-146193 | https://github.com/python/cpython/pull/146193 |
| pythongh-135953 | https://github.com/python/cpython/issues/135953 |
| python#146045 | https://github.com/python/cpython/pull/146045 |
| pythongh-143414 | https://github.com/python/cpython/issues/143414 |
| pythonGH-144300 | https://github.com/python/cpython/pull/144300 |
| pythongh-146261 | https://github.com/python/cpython/issues/146261 |
| pythonGH-146291 | https://github.com/python/cpython/pull/146291 |
| pythongh-145144 | https://github.com/python/cpython/issues/145144 |
| pythonGH-145145 | https://github.com/python/cpython/pull/145145 |
| pythongh-143959 | https://github.com/python/cpython/issues/143959 |
| pythonGH-145248 | https://github.com/python/cpython/pull/145248 |
| pythongh-146245 | https://github.com/python/cpython/issues/146245 |
| pythonGH-146248 | https://github.com/python/cpython/pull/146248 |
| pythongh-140049 | https://github.com/python/cpython/issues/140049 |
| python#140051 | https://github.com/python/cpython/pull/140051 |
| pythongh-146056 | https://github.com/python/cpython/issues/146056 |
| pythonGH-146213 | https://github.com/python/cpython/pull/146213 |
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| eendebakpt | https://github.com/eendebakpt |
| Apr 4, 2026 | https://github.com/python/cpython/pull/144300#issuecomment-4187651693 |
| main...eendebakpt:cpython:unique_list | https://github.com/python/cpython/compare/main...eendebakpt:cpython:unique_list |
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| Please reload this page | https://github.com/python/cpython/pull/144300 |
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Apr 4, 2026
| https://github.com/python/cpython/pull/144300#ref-pullrequest-3716338400 |
|
gh-130273: Fix traceback color output with unicode characters
#142529
| https://github.com/python/cpython/pull/142529 |
| ljfp | https://github.com/ljfp |
|
Apr 25, 2026
| https://github.com/python/cpython/pull/144300#ref-commit-8d05049 |
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| pythongh-143414 | https://github.com/python/cpython/issues/143414 |
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| 8d05049 | https://github.com/ljfp/cpython/commit/8d05049ffec5a472d9b2f356e4ee5d620b7e270c |
| pythonGH-144300 | https://github.com/python/cpython/pull/144300 |
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cocolato
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Fidget-Spinner
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markshannon
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