Landing: dc16f9ae5101
Project / Subsystem
gcc / match/forwprop
Date
2026-08-22
Author
Andrea Pinski
Commit
dc16f9ae5101be400b63d2bea5cbdab3fe4becfe
Source
github
Perf win
Yes
Breaking
No
All attributes
- project
- gcc
- subsystem
- match/forwprop
- patch_id
- —
- commit_hash
- dc16f9ae5101be400b63d2bea5cbdab3fe4becfe
- source_type
- github
- headline
- match/forwprop: Consolidate `cond_carry_add` patterns for simplification.
- tldr
- match/forwprop: Merges two conditional carry add patterns into one, reducing code and improving efficiency.
- author
- Andrea Pinski
- outcome
- committed
- performance_win
- true
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • compiler
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-22T00:00:00.000Z
This commit simplifies the handling of conditional carry additions by merging two existing match patterns (cond_carry_add_neg and its counterpart) into a single pattern named cond_carry_add. Previously, separate patterns handled cases where the addition was on the true or false edge of a condition. The forward propagation code did not distinguish between these edges, making the consolidation logical. This change reduces compile time and memory usage by avoiding redundant traversals and tree creations.