Landing: a7ba10ac1e02
Project / Subsystem
gcc / isel
Date
2026-07-29
Author
Jakub Jelinek
Commit
a7ba10ac1e027349a655ee4572abf34c1b9c1db1
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- isel
- patch_id
- —
- commit_hash
- a7ba10ac1e027349a655ee4572abf34c1b9c1db1
- source_type
- github
- headline
- Fix ICE on out of bounds vector element access.
- tldr
- Corrects a bug in vector element access handling that could lead to compiler internal errors.
- author
- Jakub Jelinek
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • vectorization
- • bugfix
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-29T00:00:00.000Z
The instruction selector (isel) pass in GCC could encounter an internal compiler error (ICE) when processing out-of-bounds vector element accesses. This was due to incorrect bounds checking logic that mishandled constant indices, particularly negative ones. The fix ensures correct handling of these cases by punting when indices don’t fit expected types and by using a more accurate comparison for bounds checks, preventing ICEs and ensuring correct code generation.