Landing: 920eeb67a353
Project / Subsystem
gcc / aarch64
Date
2026-02-26
Author
Artemiy Volkov
Commit
920eeb67a3537b024521f21f983be0e249faa5ea
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- aarch64
- patch_id
- —
- commit_hash
- 920eeb67a3537b024521f21f983be0e249faa5ea
- source_type
- github
- headline
- AArch64 now supports vector concatenation for sub-64-bit types.
- tldr
- GCC now handles 2-element `vec_concats` with scalar operands on AArch64, and emits `vec_duplicate` when operands are identical.
- author
- Artemiy Volkov
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • aarch64
- • vectorization
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-02-26T00:00:00.000Z
This commit enhances the handling of 2-element vec_concats in aarch64_vector_init_fallback. It extends support to scalar operands and emits vec_duplicate instead of vec_concat when operands are identical, leading to better code generation. New combine instruction patterns back this change.