Landing: f2609a4c653a
Project / Subsystem
gcc / x86_64
Date
2026-05-16
Author
Roger Sayle
Commit
f2609a4c653a4993eec7ed9a2ad05caf936f0178
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- x86_64
- patch_id
- —
- commit_hash
- f2609a4c653a4993eec7ed9a2ad05caf936f0178
- source_type
- github
- headline
- x86_64: Enable STV conversion for TImode register moves.
- tldr
- Extends x86_64's Scalar-To-Vector (STV) pass to handle TImode register moves with hard registers.
- author
- Roger Sayle
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • x86_64
- • optimization
- • simd
- • sse
- • avx
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-16T00:00:00.000Z
This commit extends the x86_64 Scalar-To-Vector (STV) pass to include chains that originate or terminate with moves from/to hard registers. By supporting STV conversion for TImode register-to-register moves, where either the source or destination (but not both) is a hard register, the compiler can now convert more code sequences to use SSE instructions which leads to faster execution.