Landing: 141edd02af70
Project / Subsystem
gcc / gcc/fold-const
Date
2026-08-05
Author
Jakub Jelinek
Commit
141edd02af705696f89ff9a804879dc51834898d
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc/fold-const
- patch_id
- —
- commit_hash
- 141edd02af705696f89ff9a804879dc51834898d
- source_type
- github
- headline
- Improve pointer arithmetic optimizations in fold-const and match.pd.
- tldr
- Enhances optimization of pointer differences involving casts and address expressions.
- author
- Jakub Jelinek
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • compiler
- • C++
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-08-05T00:00:00.000Z
Optimizations for constant pointer differences have been improved by refining the ptr_difference_const logic in match.pd and fold-const.cc. The changes address issues where certain pointer arithmetic expressions, particularly those involving casts and address expressions, were not handled correctly. By adding checks for no-operation conversions and ADDR_EXPR requirements, the compiler can now more reliably fold these expressions, preventing potential regressions and ICEs (Internal Compiler Errors).