Landing: c776dcd5f868
Project / Subsystem
gcc / i386
Date
2026-05-01
Author
Kewen Lin
Commit
c776dcd5f868a16661b86842916493b531988d1e
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- i386
- patch_id
- —
- commit_hash
- c776dcd5f868a16661b86842916493b531988d1e
- source_type
- github
- headline
- i386: Reduce build time by improving division modeling.
- tldr
- Reduces GCC build time by optimizing the modeling of division operations in the i386 backend.
- author
- Kewen Lin
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • i386
- • build time
- • optimization
- • instruction scheduling
- discussion_id_link
- github:gcc-mirror/gcc#87832
- bugzilla_pr
- —
- date
- 2026-05-01T00:00:00.000Z
GCC build time significantly increased due to excessive execution time of genautomata, caused by combinatorial explosion in division modeling in c86-4g*.md. This patch mitigates the issue by introducing dedicated automatons and cpu_units for idiv and fdiv, updating the integer, floating-point division, and square root modeling.