Landing: 13040879a854
Project / Subsystem
gcc / gcc
Date
2026-05-04
Author
Jeff Law
Commit
13040879a85435edc05bef860cc8530f51a133b5
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- 13040879a85435edc05bef860cc8530f51a133b5
- source_type
- github
- headline
- Simplify ``x + y == y`` into ``x == 0``
- tldr
- GCC now simplifies ``x + y == y`` into ``x == 0``, potentially improving code generation on RISC-V.
- author
- Jeff Law
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • risc-v
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-04T00:00:00.000Z
GCC now simplifies expressions of the form x + y == y into x == 0. This optimization can remove unnecessary arithmetic instructions. The patch also fixes a missed side_effects_p check and a typo in a constant definition, improving the robustness of the transformation.