Landing: 867ca749704d
Project / Subsystem
gcc / scev
Date
2026-05-13
Author
Tamar Christina
Commit
867ca749704d1d7bd042f1a4d8403801df8cc172
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- scev
- patch_id
- —
- commit_hash
- 867ca749704d1d7bd042f1a4d8403801df8cc172
- source_type
- github
- headline
- SCEV now maintains affine CHRECs in the presence of type conversions.
- tldr
- SCEV analysis is improved to recognize affine loop accesses even with type conversions, enabling better vectorization.
- author
- Tamar Christina
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • vectorization
- • loop
- • arm
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-13T00:00:00.000Z
The Scalar Evolution (SCEV) analysis pass is improved to better recognize affine loop accesses when type conversions are involved. This allows the vectorizer to generate more efficient code, avoiding gather operations in favor of linear memory accesses. For example, in loops that access arrays with indices involving both integer and floating-point types, SCEV can now simplify the address calculations, which leads to better performance.