Landing: 21c8ddd2cd2f
Project / Subsystem
gcc / gcc/tree-optimization
Date
2026-08-12
Author
Andrew MacLeod
Commit
21c8ddd2cd2f3bf64225e4523e20e795083676fb
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc/tree-optimization
- patch_id
- —
- commit_hash
- 21c8ddd2cd2f3bf64225e4523e20e795083676fb
- source_type
- github
- headline
- Limit phi analyzer iterations for large bit-int types
- tldr
- Prevents excessive iterations in phi analysis for large integer types.
- author
- Andrew MacLeod
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • integer-types
- • performance
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-12T00:00:00.000Z
This commit limits the number of iterations performed by the phi analyzer when simulating cyclic PHIs, specifically for large _BitInt types. The analyzer previously attempted to simulate modifiers for a number of times equal to the bit precision, which is impractical for very large types. The iteration bound is now capped at MAX_FIXED_MODE_SIZE, improving performance and preventing potential hangs.