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Created on 2021-08-18 10:25 by Mark.Shannon, last changed 2022-04-11 14:59 by admin. This issue is now closed.
| Pull Requests | |||
|---|---|---|---|
| URL | Status | Linked | Edit |
| PR 27832 | closed | Mark.Shannon, 2021-08-19 12:22 | |
| PR 30044 | open | xuxinhang, 2021-12-11 04:39 | |
| Messages (5) | |||
|---|---|---|---|
| msg399832 - (view) | Author: Mark Shannon (Mark.Shannon) *  |
Date: 2021-08-18 10:25 | |
"Medium" integers are those with a single internal digit or zero. Medium integers are integers in the range -2**30 to +2**30 on 64 bit machines. "Small" integers, -5 to 256 are cached, but are represented as medium integers internally. To a good approximation, all integers are "medium". However, we make little effort to exploit that fact in the code for binary operations, which are very common operations on integers. |
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| msg399833 - (view) | Author: Mark Dickinson (mark.dickinson) * |
Date: 2021-08-18 10:41 | |
We already special-case medium integers in the Objects/longobject.c code, in various places. For example for addition, here: https://github.com/python/cpython/blob/3240bc62f4e0afa09964f3afc845697f0a0806b9/Objects/longobject.c#L3070-L3072 Are you proposing further changes in longobject.c, or some other mechanism? |
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| msg399834 - (view) | Author: Mark Dickinson (mark.dickinson) * |
Date: 2021-08-18 10:43 | |
See also #21955, #10044, and https://github.com/python/cpython/blob/3240bc62f4e0afa09964f3afc845697f0a0806b9/Python/ceval.c#L1986-L1991 |
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| msg399838 - (view) | Author: Mark Shannon (Mark.Shannon) * |
Date: 2021-08-18 11:59 | |
Just changes to longobject.c. There are still various minor inefficiencies in testing to see whether an int is a medium value, and then throwing away size information before creating result objects. I'm not expecting this to make much difference, but every little helps. |
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| msg400263 - (view) | Author: Mark Shannon (Mark.Shannon) * |
Date: 2021-08-25 13:28 | |
New changeset 15d50d7ed8afd3ab26b00210b5b4feaaadd5af51 by Mark Shannon in branch 'main': bpo-44946: Streamline operators and creation of ints for common case of single 'digit'. (GH-27832) https://github.com/python/cpython/commit/15d50d7ed8afd3ab26b00210b5b4feaaadd5af51 |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:59:48 | admin | set | github: 89109 |
| 2021-12-11 04:39:53 | xuxinhang | set | nosy:
+ xuxinhang pull_requests: + pull_request28270 |
| 2021-08-26 15:09:37 | Mark.Shannon | set | status: open -> closed resolution: fixed stage: patch review -> resolved |
| 2021-08-25 13:28:47 | Mark.Shannon | set | messages: + msg400263 |
| 2021-08-19 12:22:06 | Mark.Shannon | set | keywords:
+ patch stage: patch review pull_requests: + pull_request26296 |
| 2021-08-18 11:59:10 | Mark.Shannon | set | messages: + msg399838 |
| 2021-08-18 10:44:15 | mark.dickinson | set | nosy:
+ vstinner |
| 2021-08-18 10:43:21 | mark.dickinson | set | messages: + msg399834 |
| 2021-08-18 10:41:40 | mark.dickinson | set | nosy:
+ mark.dickinson messages: + msg399833 |
| 2021-08-18 10:25:32 | Mark.Shannon | create | |
