[6.2] SILGen: Don't copy_addr [take] trivial address-only values. #84267
Conversation
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
This is a new case that comes up with `InlineArray`, since an `InlineArray` with unknown count but known trivial element type is trivial but still address-only due to its unknown size. We are inconsistent about whether we emit formal copies or not of these values; they should generally be unnecessary as long as the memory location of a value is sufficiently long-lived, but the SIL verifier still reasonably considers a `[take]` as an invalidation of the memory, even though at runtime a take is a no-op. Since the take is unnecessary, we can just not take when we copy out of a trivial address location. Fixes swiftlang#84141 | rdar://160007939.
|
@swift-ci Please test |
|
@swift-ci Please test Linux |
1 similar comment
|
@swift-ci Please test Linux |
tbkka
approved these changes
Sep 16, 2025
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 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Outdated suggestions cannot be applied.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.
Explanation: Fixes an assertion failure when
switch-ing or potentially performing other operations on anInlineArraywith a known-bitwise-copyable type but generic count.Scope: Bug fix.
Issues: #84141, rdar://160007939
Original PR: #84264
Risk: Low. Small change that should have no effect on most existing code.
Testing: Swift CI, test case from bug report
Reviewers: @meg-gupta, @atrick