Landing: c5d24759ba5e
Project / Subsystem
gcc / tree-optimization
Date
2026-08-24
Author
Richard Biener
Commit
c5d24759ba5e470f6fb75e251b84ec8fcb33db07
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- tree-optimization
- patch_id
- —
- commit_hash
- c5d24759ba5e470f6fb75e251b84ec8fcb33db07
- source_type
- github
- headline
- Revise (T *)(ptr - ptr_cst) pattern
- tldr
- Canonicalizes pointer arithmetic patterns for better optimization.
- author
- Richard Biener
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • pointer arithmetic
- • tree-optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-24T00:00:00.000Z
This commit refines a GCC pattern for pointer arithmetic involving type casting. The pattern (T *)(ptr - ptr_cst) is now directly canonicalized to (T *)ptr p+ cst. This change simplifies the GENERIC representation, allowing subsequent optimizations to more effectively recognize and process pointer arithmetic. The pattern was originally introduced to avoid issues with build_fold_addr_expr_with_type, and this revision ensures more robust simplification.