Landing: b4bfaf034604
Project / Subsystem
gcc / x86
Date
2026-09-26
Author
Iain Sandoe
Commit
b4bfaf0346042c4b8eecee17882c3908d1521659
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- x86
- patch_id
- —
- commit_hash
- b4bfaf0346042c4b8eecee17882c3908d1521659
- source_type
- github
- headline
- x86 testsuite: Prefer 512b vectors for Cascadelake tuning
- tldr
- Vector tests on x86 now prefer 512-bit vectors when tuning for Cascadelake.
- author
- Iain Sandoe
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • x86
- • vectorization
- • testsuite
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-26T00:00:00.000Z
Several vectorization tests for the x86 architecture have been updated to explicitly prefer 512-bit vectors when the target is tuned for Cascadelake. These tests previously assumed that 512-bit vectors would be the default choice, but Cascadelake tuning prioritizes 256-bit vectors. By setting a preference for 512-bit vectors, these tests now function correctly and validate the intended behavior for wider vector operations on this architecture.