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Title: gh-143414: Implement unique reference tracking for JIT, optimize unpacking of such tuples by reidenong · Pull Request #144300 · python/cpython · GitHub

Open Graph Title: gh-143414: Implement unique reference tracking for JIT, optimize unpacking of such tuples by reidenong · Pull Request #144300 · python/cpython

X Title: gh-143414: Implement unique reference tracking for JIT, optimize unpacking of such tuples by reidenong · Pull Request #144300 · python/cpython

Description: 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: x, y, z = f() Some notes: Only implements the unique reference tracking (and relevant optimization) for tuples in _BUILD_TUPLE, to be extended to other objects in the future Objects are deemed as not uniquely referenced when they are made aliases or duplicated, in uops of _LOAD_FAST_* and _COPY. Would appreciate any feedback. Thanks Issue: gh-143414

Open Graph Description: 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: x, y, z ...

X Description: 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: x, y, z ...

Opengraph URL: https://github.com/python/cpython/pull/144300

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gh-143414: Implement unique reference tracking for JIT, optimize unpacking of such tuples https://github.com/python/cpython/pull/144300/files#top
Show all changes 36 commits https://github.com/python/cpython/pull/144300/files
e4b7f51 Add unique reference tracking to JIT, optimize tuple unpacking reidenong Jan 28, 2026 https://github.com/python/cpython/pull/144300/commits/e4b7f511d38762cf2d44213b608eb1d6c62636f0
b32a8e2 Merge branch 'main' into branch-unique-reference-tracking reidenong Jan 28, 2026 https://github.com/python/cpython/pull/144300/commits/b32a8e2a552897ec2873b1d097eb3d2b60a1a026
7aeac0e Regenerate cases reidenong Jan 28, 2026 https://github.com/python/cpython/pull/144300/commits/7aeac0ef22b0caaab51708d69a71e40f97cceab9
f8b7e4e Fix unique tuple unpacking checks reidenong Jan 28, 2026 https://github.com/python/cpython/pull/144300/commits/f8b7e4ed8d8a323793342ae5d7874029fd664e23
37d7c4b Implement _PyTuple_ExactDealloc reidenong Jan 29, 2026 https://github.com/python/cpython/pull/144300/commits/37d7c4b8cff12b4a9935b7ca0dd0aa24dfb59787
7df2176 Rename symbol reidenong Jan 29, 2026 https://github.com/python/cpython/pull/144300/commits/7df217602471d7ac3110edf7c698397587f8729c
6f66c56 Merge branch 'main' into branch-unique-reference-tracking reidenong Jan 30, 2026 https://github.com/python/cpython/pull/144300/commits/6f66c5609b17d490e486ccf750d36b6913bc831c
b251825 Merge branch 'main' into branch-unique-reference-tracking reidenong Jan 30, 2026 https://github.com/python/cpython/pull/144300/commits/b2518259b00aa1219ebb1b2e61498c484d3015d5
bcd5654 Regenerate cases reidenong Jan 30, 2026 https://github.com/python/cpython/pull/144300/commits/bcd56548f0fc4d5d34c235a499b00dbaf8548460
acfa737 Add alignment checking reidenong Jan 31, 2026 https://github.com/python/cpython/pull/144300/commits/acfa737fb644e25ef7bfbe29fdbbea83d60152ae
a0fd9e2 Change JIT reference tags to 2 bit scheme reidenong Jan 31, 2026 https://github.com/python/cpython/pull/144300/commits/a0fd9e2db5ca6b94eeead1fa098939943c18d3d0
645776a 📜🤖 Added by blurb_it. blurb-it[bot] Jan 31, 2026 https://github.com/python/cpython/pull/144300/commits/645776a909954a355c4ba06959eeb7f028b9d984
cdb4a05 Fix style reidenong Feb 1, 2026 https://github.com/python/cpython/pull/144300/commits/cdb4a0581a3a26a5d2f1727c2d61345f056f88fd
275732b Remove unnecesssary deopt reidenong Feb 2, 2026 https://github.com/python/cpython/pull/144300/commits/275732b48e95e167ffab12820846584511ac74af
dbde059 Regenerate cases reidenong Feb 2, 2026 https://github.com/python/cpython/pull/144300/commits/dbde05909d3bb2b457e2ef5e393254eb9b43620c
bd70ebd Replace tuple deallocation with tuple free reidenong Feb 3, 2026 https://github.com/python/cpython/pull/144300/commits/bd70ebdae1ed89070130928b13bb26f39cedf157
d16f298 Merge branch 'main' into branch-unique-reference-tracking reidenong Feb 5, 2026 https://github.com/python/cpython/pull/144300/commits/d16f2982317fb6ea9d6cd687cf5ab804e2fc2ce3
bec7ee3 Regenerate cases reidenong Feb 5, 2026 https://github.com/python/cpython/pull/144300/commits/bec7ee3d1fb97d800e76b5a0f7a01919621d69f9
5c9b9c6 Add unique reference two tuple optimization reidenong Feb 5, 2026 https://github.com/python/cpython/pull/144300/commits/5c9b9c6b40d4e80d88b9de1bfaa2fd184e8c18b5
cdbe2e6 Add efficient unpacking for uniquely referenced three tuples reidenong Feb 5, 2026 https://github.com/python/cpython/pull/144300/commits/cdbe2e654a55acfd002b8d86d71e16983528c2bc
fb1d227 Move length checks to JIT reidenong Feb 6, 2026 https://github.com/python/cpython/pull/144300/commits/fb1d2271f95d75f58a526603a2eb363d49b29c9d
c7e53fb Refactor JIT reference remove unique reidenong Feb 3, 2026 https://github.com/python/cpython/pull/144300/commits/c7e53fbf2e54bea241bc586c06ee87e4e9d052ce
6851962 Remove JIT reference uniqueness on store reidenong Feb 3, 2026 https://github.com/python/cpython/pull/144300/commits/685196235e5c2bdae3b23317671bf4095e8c5775
8c8e0a9 Remove unnecessary DEOPT reidenong Feb 6, 2026 https://github.com/python/cpython/pull/144300/commits/8c8e0a91ddb4d377a192349f6c1ec09a447f50f7
a6fffdc Remove redundant make unique ops reidenong Feb 21, 2026 https://github.com/python/cpython/pull/144300/commits/a6fffdc50fdb2d75c385dd288214badadc4100f7
78978aa Merge branch 'main' into branch-unique-reference-tracking reidenong Feb 21, 2026 https://github.com/python/cpython/pull/144300/commits/78978aaf9a06afebaef739da54a43a2dd875526c
0b07ac4 Regen cases reidenong Feb 21, 2026 https://github.com/python/cpython/pull/144300/commits/0b07ac42e8b67d11e2c19d6a8ecf0cd82add8735
14e5d3d Merge branch 'main' into branch-unique-reference-tracking reidenong Feb 21, 2026 https://github.com/python/cpython/pull/144300/commits/14e5d3d58ffb1c2ee2e7ef6598521a3d3fe8886c
8506038 Merge branch 'main' into branch-unique-reference-tracking reidenong Mar 9, 2026 https://github.com/python/cpython/pull/144300/commits/8506038cd35bc0aea69026415a12bfb6fac4ed78
d67617f Regen cases reidenong Mar 9, 2026 https://github.com/python/cpython/pull/144300/commits/d67617f0eab5bc8e7568adf642bbb52ee5fc75ef
100eeb5 Merge branch 'main' into branch-unique-reference-tracking reidenong Mar 9, 2026 https://github.com/python/cpython/pull/144300/commits/100eeb5b3353cb4d20994621861ac91bc86f4352
e476061 Merge branch 'main' into branch-unique-reference-tracking reidenong Mar 11, 2026 https://github.com/python/cpython/pull/144300/commits/e47606164d329ec0445701debb51b8f24e826bfc
06a9ec1 Merge branch 'main' into branch-unique-reference-tracking reidenong Mar 11, 2026 https://github.com/python/cpython/pull/144300/commits/06a9ec17c1be5ae9396f0954504ad5094c4a821e
6bce6b4 Merge remote-tracking branch 'upstream/main' into pr/144300 Fidget-Spinner Mar 22, 2026 https://github.com/python/cpython/pull/144300/commits/6bce6b44fbd2934d7e6e9ef5907b5f3af44eccd6
89dc467 Mark unique tuple freeing as non-escaping Fidget-Spinner Mar 22, 2026 https://github.com/python/cpython/pull/144300/commits/89dc467e4d0f8f8a25edd7e7fb7113807b4310c4
4e6c792 fix a bugs in _COPY_FREE_VARS and frame creation Fidget-Spinner Mar 22, 2026 https://github.com/python/cpython/pull/144300/commits/4e6c7923eeaf2effd01f564d5083acfed93b03e4
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