Landing: 41596ef9be64
Project / Subsystem
gcc / tree-ssa-loop-im
Date
2026-09-03
Author
Kyrylo Tkachov
Commit
41596ef9be648c8488165c95be1aacb228ad6750
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- tree-ssa-loop-im
- patch_id
- —
- commit_hash
- 41596ef9be648c8488165c95be1aacb228ad6750
- source_type
- github
- headline
- tree-ssa-loop-im: Reject trapping store motion with non-call EH
- tldr
- Disallows moving stores out of loops when non-call exceptions are enabled to prevent incorrect behavior.
- author
- Kyrylo Tkachov
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • exception handling
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-03T00:00:00.000Z
The loop invariant motion (LIM) pass in GCC incorrectly handled exception information when moving stores out of loops. Previously, it treated bare memory references as loads, and a safe load didn’t prove a store to the same address couldn’t trap. This change ensures that trapping stores are rejected when exception handling is enabled and non-call exceptions can be thrown, preventing potential runtime errors. A new test case verifies this behavior.