Landing: eae54dd6e4cc
Project / Subsystem
gcc / vect
Date
2026-05-27
Author
Tamar Christina
Commit
eae54dd6e4cc69b4c86521f501339ef9fe0eab3f
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- vect
- patch_id
- —
- commit_hash
- eae54dd6e4cc69b4c86521f501339ef9fe0eab3f
- source_type
- github
- headline
- Vectorization: Drop prefetches during if-conversion.
- tldr
- The vectorizer will now drop prefetches during if-conversion, which simplifies later vectorization efforts.
- author
- Tamar Christina
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • vectorization
- • prefetch
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-27T00:00:00.000Z
This change addresses an issue where prefetches within conditional statements were not being properly handled during vectorization. The conditionality introduced a non-if-convertible block, preventing the vectorizer from removing the prefetch. This patch now drops these prefetches during if-conversion, paving the way for potential vectorization of these prefetches in the future.