Landing: 0bf6e399dbc8
Project / Subsystem
gcc / gcc
Date
2026-08-05
Author
Andrew MacLeod
Commit
0bf6e399dbc8e1f6d2b3f7e0f3a0cab9ac55b572
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- 0bf6e399dbc8e1f6d2b3f7e0f3a0cab9ac55b572
- source_type
- github
- headline
- Check for undefined in operator_lshift::op1_range.
- tldr
- GCC's left shift range analysis now correctly handles undefined results.
- author
- Andrew MacLeod
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • compiler
- • optimization
- • arithmetic
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-05T00:00:00.000Z
The operator_lshift::op1_range function in GCC’s range-op.cc has been updated to correctly handle cases where the result of a left shift operation is undefined. If an undefined result is detected, the calculation is now aborted, preventing potential inaccuracies in value range analysis.