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Created on 2021-12-01 13:30 by Mark.Shannon, last changed 2022-04-11 14:59 by admin. This issue is now closed.
| Pull Requests | |||
|---|---|---|---|
| URL | Status | Linked | Edit |
| PR 29879 | merged | Mark.Shannon, 2021-12-01 14:04 | |
| Messages (2) | |||
|---|---|---|---|
| msg407457 - (view) | Author: Mark Shannon (Mark.Shannon) *  |
Date: 2021-12-01 13:30 | |
To get to the dict (or values array) of an object, we currently need 3 dependent loads. By placing the dict at a fixed offset, this can be reduced to one. What was `obj[obj->type->dictoffset]` becomes `obj[FIXED_OFFSET]` See https://github.com/faster-cpython/ideas/issues/80, specifically https://github.com/faster-cpython/ideas/issues/80#issuecomment-931504847 for more details. |
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| msg407946 - (view) | Author: Mark Shannon (Mark.Shannon) * |
Date: 2021-12-07 16:03 | |
New changeset 8319114feedd2a5b77378bba24eb9fb2689c5033 by Mark Shannon in branch 'main': bpo-45947: Place dict and values pointer at fixed (negative) offset just before GC header. (GH-29879) https://github.com/python/cpython/commit/8319114feedd2a5b77378bba24eb9fb2689c5033 |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:53 | admin | set | github: 90105 |
| 2022-01-20 11:51:02 | Mark.Shannon | set | status: open -> closed resolution: fixed stage: patch review -> resolved |
| 2021-12-07 16:03:03 | Mark.Shannon | set | messages: + msg407946 |
| 2021-12-04 17:31:40 | kj | set | nosy:
+ kj |
| 2021-12-01 14:04:55 | Mark.Shannon | set | keywords:
+ patch stage: patch review pull_requests: + pull_request28104 |
| 2021-12-01 13:30:48 | Mark.Shannon | create | |