Landing: 3e6ac9b8d877
Project / Subsystem
gcc / tree-optimization
Date
2026-07-29
Author
Richard Biener
Commit
3e6ac9b8d87704323df1f12214c29725c4e5eb9d
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- tree-optimization
- patch_id
- —
- commit_hash
- 3e6ac9b8d87704323df1f12214c29725c4e5eb9d
- source_type
- github
- headline
- Robustify reduction analysis by handling unsupported operations early
- tldr
- Prevents compiler crashes by performing early checks for vectorizable reduction operations.
- author
- Richard Biener
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • vectorization
- • compiler bug
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-29T00:00:00.000Z
This commit improves the robustness of the vectorization reduction analysis by adding an early exit for unsupported reduction operations. The analysis previously assumed a direct correspondence between GIMPLE statement operands and SLP (Shortest-Length Processing) vectorization operands, which can break for operations like count-leading-zeros with multiple operands. By rejecting such cases upfront, the compiler avoids internal errors (ICEs) and provides better diagnostics.