Landing: d6ca7e8e1cf6
Project / Subsystem
gcc / tree-optimization
Date
2026-09-23
Author
Richard Biener
Commit
d6ca7e8e1cf62734f0257cdc668da907cf3e0297
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- tree-optimization
- patch_id
- —
- commit_hash
- d6ca7e8e1cf62734f0257cdc668da907cf3e0297
- source_type
- github
- headline
- Fix offset computation association in VNVN
- tldr
- Corrects an offset computation in GCC's SCCVN pass to prevent potential overflows and UBSAN issues.
- author
- Richard Biener
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • bugfix
- • UBSAN
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-23T00:00:00.000Z
GCC’s Sparse Conditional Constant Propagation (SCCVN) pass has been fixed to correctly associate offset computations. This change addresses a bug flagged by UBSAN, ensuring that the computation order prevents overflows and accurately reflects the intended logic, thereby improving the robustness of the optimization.