Landing: cd52e71e8aea
Project / Subsystem
gcc / gcc
Date
2026-06-10
Author
Andrew MacLeod
Commit
cd52e71e8aea258342deca45868bf2529d4fdd76
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- cd52e71e8aea258342deca45868bf2529d4fdd76
- source_type
- github
- headline
- GCC refines modulo range analysis for fixed quotients.
- tldr
- The GCC optimizer improves modulo operations by simplifying them when the division yields a constant quotient.
- author
- Andrew MacLeod
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • performance
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-06-10T00:00:00.000Z
GCC’s range-op.cc module now refines modulo operations when division of x by y consistently produces the same quotient. This optimization rewrites x % y as x - Q * y, where Q is the fixed quotient. This change improves the compiler’s ability to simplify expressions, potentially leading to more efficient code generation.