Landing: 65f27f5a1562
Project / Subsystem
gcc / i386
Date
2026-09-22
Author
Kyrylo Tkachov
Commit
65f27f5a1562300f72b0fe8cfd65e7901f528763
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- i386
- patch_id
- —
- commit_hash
- 65f27f5a1562300f72b0fe8cfd65e7901f528763
- source_type
- github
- headline
- Prevent duplicate ENDBR instructions in GCC's CET pass
- tldr
- GCC's Control-flow Enforcement Technology (CET) pass now avoids inserting redundant ENDBR instructions.
- author
- Kyrylo Tkachov
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • i386
- • security
- • cet
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-22T00:00:00.000Z
This commit addresses an issue in GCC’s Control-flow Enforcement Technology (CET) pass where duplicate ENDBR (End Branch) instructions were being inserted. This occurred when different switch tables pointed to the same case block, or when dispatches shared a table. The fix ensures that an ENDBR is reused if one already exists after the destination label, preventing unnecessary instructions and potential overhead.