Landing: 18d08c0e6115
Project / Subsystem
gcc / match.pd
Date
2026-05-16
Author
Jakub Jelinek
Commit
18d08c0e6115e6c34eaed73f242ccf210a455240
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- match.pd
- patch_id
- —
- commit_hash
- 18d08c0e6115e6c34eaed73f242ccf210a455240
- source_type
- github
- headline
- match.pd: Enable bswap optimizations for bitreverse builtins.
- tldr
- Extends existing bswap optimizations in match.pd to also cover bitreverse builtins.
- author
- Jakub Jelinek
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • bitreverse
- • bswap
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-16T00:00:00.000Z
This commit expands the pattern matching rules to apply bswap optimizations to bitreverse builtins as well. This change enables the compiler to perform a wider range of optimizations on code using bit reversal operations, potentially improving performance on platforms where bit reversal can be implemented efficiently.