Repository navigation
Remove extraneous branch from push - #241
Merged
Merged
Conversation
Collaborator
|
@bors-servo r+ Thanks! |
Contributor
|
📌 Commit 79f4132 has been approved by |
Contributor
Contributor
|
☀️ Test successful - checks-travis |
mbrubeck
added a commit
to mbrubeck/rust-smallvec
that referenced
this pull request
Dec 4, 2020
Release notes: * Improve performance of `push` (servo#241).
Merged
bors-servo
added a commit
that referenced
this pull request
Dec 4, 2020
Version 1.5.1 Release notes: * Improve performance of `push` (#241).
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
3 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Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be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.
pushdoes two branches on the "smallness" of thesmallvec: one before the reserve check and one after. LLVM doesn't seem to optimize the second branch away for the (very common) non-growing case. In addition, in the growing branch we know the memory will be on the heap, so no need to branch here.On my machine, this improves
bench_pushfrom approx 300ns to 263ns (+/- 5 on both).