Landing: 1df48a01e07e
Project / Subsystem
gcc / match
Date
2026-07-10
Author
Kael Andrew Franco
Commit
1df48a01e07e30592e0119232b1aaf3d41be03f4
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- match
- patch_id
- —
- commit_hash
- 1df48a01e07e30592e0119232b1aaf3d41be03f4
- source_type
- github
- headline
- match: Use tree_expr_nonnegative_p for (X / Y) (==, !=) 0 -> X (<,>=) Y [PR125738]
- tldr
- Improves optimization by using tree_expr_nonnegative_p for division-related condition simplification.
- author
- Kael Andrew Franco
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • tree-ssa
- • match.pd
- • unsigned types
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-10T00:00:00.000Z
This commit enhances GCC’s optimization capabilities by using tree_expr_nonnegative_p in match.pd to correctly simplify expressions involving division. Specifically, it enables the transformation of (X / Y) (==, !=) 0 to X (<,>=) Y when X and Y are known to be non-negative. This change relaxes the conditions for this optimization, addressing issues with unsigned types and ensuring more aggressive and correct simplification of conditional expressions.