Landing: 5e63fb58f84e
Project / Subsystem
gcc / tree-optimization
Date
2026-07-15
Author
Richard Biener
Commit
5e63fb58f84e3ce19cb336710f69094ecbd4b63d
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- tree-optimization
- patch_id
- —
- commit_hash
- 5e63fb58f84e3ce19cb336710f69094ecbd4b63d
- source_type
- github
- headline
- Vector placement improved for live lane extracts
- tldr
- Vectorizer pre-computes insertion points for SLP nodes, improving feasibility checks for live scalar lane extractions.
- author
- Richard Biener
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • vectorization
- • optimization
- • SLP
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-15T00:00:00.000Z
This commit improves the vectorizer’s ability to determine the feasibility of placing lane extractions for live scalar values. It achieves this by pre-computing an insertion place for all SLP nodes, which is then used to refine the feasibility computation. While re-using this computation for actual insertion is currently problematic due to potential scalar statement elision, this pre-computation validates earlier scheduling decisions and enhances the accuracy of live lane extract placement.