Landing: c65691bc5a28
Project / Subsystem
gcc / gcc
Date
2026-04-29
Author
Andrew Pinski
Commit
c65691bc5a2873e0e2ffbfcaa80eb9bdc6e1f7b8
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- c65691bc5a2873e0e2ffbfcaa80eb9bdc6e1f7b8
- source_type
- github
- headline
- Match: Simplify patterns for `a != b` implies a or b is non-zero
- tldr
- The compiler's pattern-matching code for simplifying logical expressions is now more concise.
- author
- Andrew Pinski
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • pattern matching
- • code generation
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-04-29T00:00:00.000Z
The compiler’s pattern-matching rules for expressions of the form (a != b) &| ((a|b) ==/!= 0) are now defined using a for loop, which simplifies the code and shrinks the generated gimple-match*.cc files by about 300 lines. The c: constraint in the inner ne/eq pattern is now redundant and has been removed.