Landing: fce59fc4a405
Project / Subsystem
gcc / tree-optimization
Date
2026-09-18
Author
Richard Biener
Commit
fce59fc4a405721468cd02eb0eba48a684e378e4
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- tree-optimization
- patch_id
- —
- commit_hash
- fce59fc4a405721468cd02eb0eba48a684e378e4
- source_type
- github
- headline
- Avoid starting SLP groups with unvectorizable loads
- tldr
- Prevents SLP optimization from beginning a vectorization group with a load instruction that cannot be vectorized.
- author
- Richard Biener
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • vectorization
- • tree-optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-18T00:00:00.000Z
This commit addresses a bug in SLP discovery by preventing it from starting a vectorization group with an unvectorizable load instruction. The change refactors how non-grouped loads are handled, ensuring that such loads are rejected early in the process before being incorrectly selected as the first match for a group.