Landing: e8f4e91989f0
Project / Subsystem
gcc / match
Date
2026-08-10
Author
Kael Andrew Alonzo Franco
Commit
e8f4e91989f0b57463f1b726f94344ddbe2bb128
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- match
- patch_id
- —
- commit_hash
- e8f4e91989f0b57463f1b726f94344ddbe2bb128
- source_type
- github
- headline
- match: 1 / X -> X == 1 for positive X. [PR125735]
- tldr
- Correctly optimizes division by a variable in GCC's pattern matching to improve code generation.
- author
- Kael Andrew Alonzo Franco
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • bugfix
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-10T00:00:00.000Z
This commit corrects a pattern matching rule in GCC’s tree-optimization passes. Previously, the rule for 1 / X when X was positive was not correctly identified as equivalent to X == 1. This change uses tree_expr_nonnegative_p to ensure signed positive values are handled, leading to more accurate optimization of division operations.