Landing: 4e37a91129de
Project / Subsystem
gcc / tree-optimization
Date
2026-08-25
Author
Richard Biener
Commit
4e37a91129de4dab6ef37a6b432c565def1ba9f4
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- tree-optimization
- patch_id
- —
- commit_hash
- 4e37a91129de4dab6ef37a6b432c565def1ba9f4
- source_type
- github
- headline
- Fix outer loop vectorization data reference analysis.
- tldr
- GCC's vectorizer now correctly analyzes data references for outer loop vectorization by using MEM_REF instead of INDIRECT_REF.
- author
- Richard Biener
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • vectorization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-25T00:00:00.000Z
GCC’s vectorizer has been fixed to correctly analyze data references for outer loop vectorization. The previous implementation used build_fold_indirect_ref, which led to incorrect type and alignment analysis. This change replaces it with a MEM_REF of the original DR_REF type, enabling more accurate analysis of the innermost loop’s behavior. A new test case, pr127049.C, is included to verify the fix.