bpo-47053: Refactor BINARY_OP_INPLACE_ADD_UNICODE#32122
Merged
sweeneyde merged 2 commits intopython:mainfrom Mar 29, 2022
Merged
bpo-47053: Refactor BINARY_OP_INPLACE_ADD_UNICODE#32122sweeneyde merged 2 commits intopython:mainfrom
sweeneyde merged 2 commits intopython:mainfrom
Conversation
Member
Author
|
Microbenchmark: Mean +- std dev: [before] 454 us +- 3 us -> [after] 437 us +- 4 us: 1.04x faster |
Fidget-Spinner
approved these changes
Mar 26, 2022
| PyObject *var = GETLOCAL(next_oparg); | ||
| DEOPT_IF(var != left, BINARY_OP); | ||
| PyObject **target_local = &GETLOCAL(_Py_OPARG(true_next)); | ||
| DEOPT_IF(*target_local != left, BINARY_OP); |
Member
Author
There was a problem hiding this comment.
On the last iteration here for example:
>>> pairs = [('foo',) * 2 for _ in range(10_000)]
>>> pairs.append(('foo', 'bar'))
>>> def f():
... for x, y in pairs:
... x = y + 'a'
...
>>> f()
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
4 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Letting
PyUnicode_Appenddirectly modify the target local avoids the nextSTORE_FAST, and it avoids theGETLOCAL(next_oparg) = NULL;.https://bugs.python.org/issue47053