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Merged
Fidget-Spinner merged 8 commits into from
Mar 7, 2023
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gh-95913: Edit Faster CPython section in 3.11 WhatsNew #98429

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a7493eb
Add cross references and fix syntax for main sections
CAM-Gerlach Oct 19, 2022
5e67f8b
Add cross references and refine reST syntax in specialization table
CAM-Gerlach Oct 19, 2022
2fda457
Convert FAQ from manually-formatted to section headings + ref targets
CAM-Gerlach Oct 19, 2022
3d614ee
Improve readibility/reduce choppiness & a few other textual tweaks
CAM-Gerlach Oct 19, 2022
6fe84e8
Apply textual clarifications from Ken Jin
CAM-Gerlach Oct 19, 2022
076e331
Add Brandt's gh-91404 regex speedup from Optimizations to Misc section
CAM-Gerlach Oct 19, 2022
2b24d4e
Add zero-cost exceptions moved from Optimization section
CAM-Gerlach Oct 20, 2022
0e898cd
LOAD_GLOBAL without call
Fidget-Spinner Mar 6, 2023
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Add cross references and refine reST syntax in specialization table
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@CAM-Gerlach
CAM-Gerlach committed Oct 19, 2022
commit 5e67f8ba11866a2ce720d0c0bb1d2c0abe7bd201
41 changes: 21 additions & 20 deletions Doc/whatsnew/3.11.rst
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Expand Up @@ -1298,32 +1298,32 @@ Bucher, with additional help from Irit Katriel and Dennis Sweeney.)
| Operation | Form | Specialization | Operation speedup | Contributor(s) |
| | | | (up to) | |
+===============+====================+=======================================================+===================+===================+
| Binary | ``x+x; x*x; x-x;`` | Binary add, multiply and subtract for common types | 10% | Mark Shannon, |
| operations | | such as ``int``, ``float``, and ``str`` take custom | | Dong-hee Na, |
| | | fast paths for their underlying types. | | Brandt Bucher, |
| Binary | ``x + x`` | Binary add, multiply and subtract for common types | 10% | Mark Shannon, |
| operations | | such as :class:`int`, :class:`float` and :class:`str` | | Dong-hee Na, |
| | ``x - x`` | take custom fast paths for their underlying types. | | Brandt Bucher, |
| | | | | Dennis Sweeney |
| | ``x * x`` | | | |
+---------------+--------------------+-------------------------------------------------------+-------------------+-------------------+
| Subscript | ``a[i]`` | Subscripting container types such as ``list``, | 10-25% | Irit Katriel, |
| | | ``tuple`` and ``dict`` directly index the underlying | | Mark Shannon |
| | | data structures. | | |
| Subscript | ``a[i]`` | Subscripting container types such as :class:`list`, | 10-25% | Irit Katriel, |
| | | :class:`tuple` and :class:`dict` directly index | | Mark Shannon |
| | | the underlying data structures. | | |
| | | | | |
| | | Subscripting custom ``__getitem__`` | | |
| | | Subscripting custom :meth:`~object.__getitem__` | | |
| | | is also inlined similar to :ref:`inline-calls`. | | |
+---------------+--------------------+-------------------------------------------------------+-------------------+-------------------+
| Store | ``a[i] = z`` | Similar to subscripting specialization above. | 10-25% | Dennis Sweeney |
| subscript | | | | |
+---------------+--------------------+-------------------------------------------------------+-------------------+-------------------+
| Calls | ``f(arg)`` | Calls to common builtin (C) functions and types such | 20% | Mark Shannon, |
| | ``C(arg)`` | as ``len`` and ``str`` directly call their underlying | | Ken Jin |
| | | C version. This avoids going through the internal | | |
| | | calling convention. | | |
| | | | | |
| | | as :func:`len` and :class:`str` directly call their | | Ken Jin |
| | ``C(arg)`` | underlying C version. This avoids going through the | | |
| | | internal calling convention. | | |
+---------------+--------------------+-------------------------------------------------------+-------------------+-------------------+
| Load | ``print`` | The object's index in the globals/builtins namespace | [1]_ | Mark Shannon |
| global | ``len`` | is cached. Loading globals and builtins require | | |
| variable | | zero namespace lookups. | | |
| Load | ``print()`` | The object's index in the globals/builtins namespace | [#load-global]_ | Mark Shannon |
| global | | is cached. Loading globals and builtins require | | |
| variable | ``len()`` | zero namespace lookups. | | |
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+---------------+--------------------+-------------------------------------------------------+-------------------+-------------------+
| Load | ``o.attr`` | Similar to loading global variables. The attribute's | [2]_ | Mark Shannon |
| Load | ``o.attr`` | Similar to loading global variables. The attribute's | [#load-attr]_ | Mark Shannon |
| attribute | | index inside the class/object's namespace is cached. | | |
| | | In most cases, attribute loading will require zero | | |
| | | namespace lookups. | | |
Expand All @@ -1335,14 +1335,15 @@ Bucher, with additional help from Irit Katriel and Dennis Sweeney.)
| Store | ``o.attr = z`` | Similar to load attribute optimization. | 2% | Mark Shannon |
| attribute | | | in pyperformance | |
+---------------+--------------------+-------------------------------------------------------+-------------------+-------------------+
| Unpack | ``*seq`` | Specialized for common containers such as ``list`` | 8% | Brandt Bucher |
| Sequence | | and ``tuple``. Avoids internal calling convention. | | |
| Unpack | ``*seq`` | Specialized for common containers such as | 8% | Brandt Bucher |
| Sequence | | :class:`list` and :class:`tuple`. | | |
| | | Avoids internal calling convention. | | |
+---------------+--------------------+-------------------------------------------------------+-------------------+-------------------+

.. [1] A similar optimization already existed since Python 3.8. 3.11
specializes for more forms and reduces some overhead.
.. [#load-global] A similar optimization already existed since Python 3.8.
3.11 specializes for more forms and reduces some overhead.

.. [2] A similar optimization already existed since Python 3.10.
.. [#load-attr] A similar optimization already existed since Python 3.10.
3.11 specializes for more forms. Furthermore, all attribute loads should
be sped up by :issue:`45947`.

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