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cpython/Objects
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Gregory P. Smith a966d94e76
gh-144157: Optimize bytes.translate() by deferring change detection (GH-144158) 
Optimize bytes.translate() by deferring change detection

Move the equality check out of the hot loop to allow better compiler
optimization. Instead of checking each byte during translation, perform
a single memcmp at the end to determine if the input can be returned
unchanged.

This allows compilers to unroll and pipeline the loops, resulting in ~2x
throughput improvement for medium-to-large inputs (tested on an AMD zen2).
No change observed on small inputs.

It will also be faster for bytes subclasses as those do not need change
detection.
2026-01-22 09:21:07 -08:00
..
clinic
gh-129068: Make range iterators thread-safe (gh-142886)
2025-12-18 13:11:51 -05:00
mimalloc
…
stringlib
gh-139353: Rename formatter_unicode.c to unicode_formatter.c (#139723)
2025-10-08 14:56:00 +02:00
abstract.c
GH-139922: Tail calling for MSVC (VS 2026) (GH-143068)
2025-12-22 23:01:34 +00:00
boolobject.c
…
bytearrayobject.c
gh-143003: Fix possible shared buffer overflow in bytearray.extend() (GH-143086)
2025-12-28 12:30:36 +00:00
bytes_methods.c
gh-129813, PEP 782: Use PyBytesWriter in _Py_bytes_maketrans() (#139044)
2025-09-17 17:43:30 +02:00
bytesobject.c
gh-144157: Optimize bytes.translate() by deferring change detection (GH-144158)
2026-01-22 09:21:07 -08:00
call.c
gh-142737: Handle lost io.open in _Py_FindSourceFile (GH-142747)
2025-12-15 22:58:50 +00:00
capsule.c
…
cellobject.c
…
classobject.c
gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614)
2025-06-30 11:14:31 +00:00
codeobject.c
gh-141504: Refactor policy object into a single opt_config (gh-143644)
2026-01-15 09:53:00 +09:00
complexobject.c
gh-141004: soft-deprecate Py_INFINITY macro (#141033)
2025-11-12 13:44:49 +01:00
descrobject.c
gh-111489: Remove _PyTuple_FromArray() alias (#139973)
2025-10-11 22:58:14 +02:00
dictnotes.txt
…
dictobject.c
gh-132657: Add maybe_enable_deferred_ref_count() (gh-142843)
2026-01-17 01:54:43 +00:00
enumobject.c
gh-137609: Change names of some positional-only parameters in builtins (GH-137611)
2025-08-25 15:36:06 +03:00
exceptions.c
gh-129824: Fix data race in _PyBuiltins_AddExceptions with subinterpreters (gh-143446)
2026-01-06 09:15:55 -05:00
fileobject.c
gh-130821: Add type information to error messages for invalid return type (GH-130835)
2025-08-14 11:04:41 +03:00
floatobject.c
gh-143006: Fix and optimize mixed comparison of float and int (GH-143084)
2026-01-09 19:06:45 +02:00
frameobject.c
gh-120321: Make gen.gi_frame.clear() thread-safe (gh-143112)
2026-01-08 14:45:54 -05:00
funcobject.c
gh-139109: A new tracing JIT compiler frontend for CPython (GH-140310)
2025-11-13 18:08:32 +00:00
genericaliasobject.c
gh-143635: Fix crash in ga_repr_items_list (#143670)
2026-01-15 06:50:47 +03:00
genobject.c
gh-143939: Fix assignment to _PyThreadStateImpl.generator_return_kind (gh-143951)
2026-01-20 17:51:55 +00:00
interpolationobject.c
gh-132661: Add default value (of "") for Interpolation.expression (#136441)
2025-07-10 16:27:41 +02:00
iterobject.c
gh-130821: Add type information to error messages for invalid return type (GH-130835)
2025-08-14 11:04:41 +03:00
listobject.c
gh-129069: fix more thread safety issues in list (#143019)
2025-12-22 21:45:28 +05:30
listsort.txt
gh-135551: Change how sorting picks minimum run length (#135553)
2025-06-26 23:48:05 -05:00
lnotab_notes.txt
…
longobject.c
gh-132108: Add Buffer Protocol support to int.from_bytes to improve performance (#132109)
2026-01-13 10:33:26 +01:00
memoryobject.c
gh-142664: fix PyObject_Hash invokation post GH-143217 (#143223)
2025-12-27 14:30:09 +00:00
methodobject.c
gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614)
2025-06-30 11:14:31 +00:00
moduleobject.c
gh-141780: Make PyModule_FromSlotsAndSpec enable GIL if needed (GH-141785)
2025-11-24 13:26:35 +01:00
namespaceobject.c
gh-136193: Improve TypeError msg when comparing two SimpleNamespaces (#136195)
2025-07-02 14:32:41 +03:00
object_layout_312.gv
…
object_layout_312.png
gh-71648: Optimize PNG files (GH-138842)
2025-09-12 20:13:05 +00:00
object_layout_313.gv
…
object_layout_313.png
gh-71648: Optimize PNG files (GH-138842)
2025-09-12 20:13:05 +00:00
object_layout_full_312.gv
…
object_layout_full_312.png
gh-71648: Optimize PNG files (GH-138842)
2025-09-12 20:13:05 +00:00
object_layout_full_313.gv
…
object_layout_full_313.png
gh-71648: Optimize PNG files (GH-138842)
2025-09-12 20:13:05 +00:00
object_layout.md
…
object.c
gh-102809: No longer mention Misc/gdbinit in the code (#143980)
2026-01-19 18:36:55 +01:00
obmalloc.c
gh-132070: Fix PyObject_Realloc thread-safety in free threaded Python (gh-143441)
2026-01-06 15:55:37 -05:00
odictobject.c
gh-142217: Remove internal _Py_Identifier functions (#142219)
2025-12-03 14:33:32 +01:00
picklebufobject.c
gh-135607: remove null checking of weakref list in dealloc of extension modules and objects (#135614)
2025-06-30 11:14:31 +00:00
rangeobject.c
gh-129068: Make range iterators thread-safe (gh-142886)
2025-12-18 13:11:51 -05:00
README
…
setobject.c
gh-141805: Fix crash after concurrent addition objects with the same hash to set (GH-143815)
2026-01-14 23:29:17 +02:00
sliceobject.c
gh-142913: Add test case for interpreter generator w/ overridden opcodes (#142911)
2026-01-16 10:33:29 -08:00
structseq.c
gh-111489: Remove _PyTuple_FromArray() alias (#139973)
2025-10-11 22:58:14 +02:00
templateobject.c
gh-142433: Move deref to below the error when checking for laststring (#142402)
2025-12-10 16:41:52 +01:00
tupleobject.c
GH-139951: Fix major GC performance regression (GH-140262)
2025-10-21 15:22:15 +01:00
typeobject.c
Remove outdated comment about excess_args warning in object.__init__ (#143669)
2026-01-11 10:27:11 +03:00
typeslots.inc
Revert "gh-133395: add option for extension modules to specialize BINARY_OP/SUBSCR, apply to arrays (#133396)" (#133498)
2025-05-06 13:12:26 +03:00
typeslots.py
…
typevarobject.c
gh-143089: Fix ParamSpec default examples to use list instead of tuple (#143179)
2026-01-07 19:32:44 -08:00
unicode_format.c
gh-139353: Add Objects/unicode_format.c file (#139491)
2025-10-10 12:52:59 +02:00
unicode_formatter.c
gh-139353: Rename formatter_unicode.c to unicode_formatter.c (#139723)
2025-10-08 14:56:00 +02:00
unicode_writer.c
gh-139353: Add Objects/unicode_writer.c file (#139911)
2025-10-30 14:36:15 +01:00
unicodectype.c
gh-129117: Add unicodedata.isxidstart() function (#140269)
2025-10-30 10:18:12 +00:00
unicodeobject.c
gh-141070: Rename PyUnstable_Object_Dump to PyObject_Dump (GH-142848)
2026-01-16 09:19:43 -05:00
unicodetype_db.h
closes gh-138706: update Unicode to 17.0.0 (#138719)
2025-09-11 09:58:39 -07:00
unionobject.c
gh-140348: Fix using | on unusual objects plus Unions (#140383)
2025-11-03 06:50:37 -08:00
weakrefobject.c
gh-133644: remove PyWeakref_GetObject and PyWeakref_GET_OBJECT (GH-133657)
2025-09-24 11:25:56 +02:00

README 

Source files for various builtin objects