Landing: 157cf7898dbd
Project / Subsystem
gcc / gcc
Date
2026-08-18
Author
Richard Biener
Commit
157cf7898dbdd43d39b2f2a9cf4390f0338d2ad3
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- 157cf7898dbdd43d39b2f2a9cf4390f0338d2ad3
- source_type
- github
- headline
- improve vect_optimize_slp_pass::containing_loop
- tldr
- Enhances GCC's SLP vectorizer to better identify the containing loop for VEC_PERM nodes.
- author
- Richard Biener
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • gcc
- • optimization
- • vectorization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-18T00:00:00.000Z
GCC’s SLP (Short-Loop-as-Parallel) vectorization pass has been improved to more accurately determine the containing loop for VEC_PERM nodes. Previously, it might fall back to the loop root node. This change now uses the region entry block to indicate the containing loop when a node lacks a representative, avoiding unnecessary fallbacks.