Landing: 7da4eb256f16
Project / Subsystem
gcc / tree-optimization
Date
2026-07-28
Author
Philipp Tomsich
Commit
7da4eb256f169fdc6bf3849b247d81f2e9404eb3
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- tree-optimization
- patch_id
- —
- commit_hash
- 7da4eb256f169fdc6bf3849b247d81f2e9404eb3
- source_type
- github
- headline
- Perform inverse converted +- lookup in Value Numbering
- tldr
- Fixes incorrect code generation for arithmetic operations in Value Numbering.
- author
- Philipp Tomsich
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • compiler bug
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-28T00:00:00.000Z
This commit corrects an issue in Value Numbering where an arithmetic operation was assumed to not overflow, leading to incorrect code generation for certain conversions. The fix adjusts how these operations are processed to ensure they are handled correctly, regardless of the order they appear in the intermediate representation. This change also broadens the applicability of the optimization to include sign changes and targets like ILP32.