Landing: 40c2f0369cc1
Project / Subsystem
gcc / aarch64
Date
2026-08-03
Author
Kyrylo Tkachov
Commit
40c2f0369cc19251696b882ea41381b2c35708cd
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- aarch64
- patch_id
- —
- commit_hash
- 40c2f0369cc19251696b882ea41381b2c35708cd
- source_type
- github
- headline
- aarch64: name the saturating narrow patterns after the sstrunc and ustrunc optabs
- tldr
- Improves vectorization of saturating narrowing operations on AArch64 by correctly naming patterns.
- author
- Kyrylo Tkachov
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • aarch64
- • vectorization
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-03T00:00:00.000Z
Vectorization of saturating narrowing operations on AArch64 has been improved by correctly naming the relevant patterns. Previously, the backend lacked the necessary sstrunc or ustrunc optabs, causing saturating narrowing loops to be vectorized inefficiently using clamps and permutes. This commit adds the expander and ensures the patterns match correctly, reducing the instruction count for such operations.