Landing: de7756c90f3b
Project / Subsystem
gcc / gcc/tree-optimization
Date
2026-06-10
Author
Richard Biener
Commit
de7756c90f3bebdf02492842ec355d7e18745e7b
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc/tree-optimization
- patch_id
- —
- commit_hash
- de7756c90f3bebdf02492842ec355d7e18745e7b
- source_type
- github
- headline
- Optimization for left shifts by additions sets correct vector type
- tldr
- GCC's tree vectorizer now correctly handles vector types when optimizing left shifts implemented as additions, improving code generation accuracy.
- author
- Richard Biener
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • vectorization
- • bugfix
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-06-10T00:00:00.000Z
This commit corrects an issue in GCC’s tree vectorizer where internally generated statements for left shifts by additions failed to specify the correct vector type. The synth_lshift_by_additions and apply_binop_and_append_stmt functions now ensure the proper vector type is set on the pattern statements. This fix improves the accuracy of vectorized code generated by the compiler, avoiding potential type-mismatches and incorrect optimizations.