Landing: 899588f3cc1a
Project / Subsystem
gcc / sh
Date
2026-07-04
Author
Oleg Endo
Commit
899588f3cc1afe045904a238cb060d4254497c2f
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- sh
- patch_id
- —
- commit_hash
- 899588f3cc1afe045904a238cb060d4254497c2f
- source_type
- github
- headline
- SH: Avoid FPUL for fp-constant loads
- tldr
- Optimizes floating-point constant loads on SH by avoiding unnecessary use of FPUL register.
- author
- Oleg Endo
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • sh
- • optimization
- • register-allocation
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-04T00:00:00.000Z
This commit optimizes floating-point constant loads on the SH architecture by adjusting instruction patterns. Specifically, it changes the constraint for a constant-pool load from FPUL-specific to a more general one, discouraging FPUL usage for regular floating-point registers while still allowing it when necessary. This change aims to improve performance by preferring dedicated floating-point registers.