Landing: 20897922c9b4
Project / Subsystem
gcc / gcc/loop-optimization
Date
2026-09-02
Author
Richard Biener
Commit
20897922c9b4b63333615ec01d92fcc5a5a771ea
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc/loop-optimization
- patch_id
- —
- commit_hash
- 20897922c9b4b63333615ec01d92fcc5a5a771ea
- source_type
- github
- headline
- Loop invariant code motion honors -fwrapv-pointer
- tldr
- Loop invariant analysis now correctly considers pointer wrapping behavior when `-fwrapv-pointer` is enabled.
- author
- Richard Biener
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • loop-optimization
- • optimization
- • pointer-arithmetic
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-02T00:00:00.000Z
The nowrap_type_p function, used by loop invariant optimization (IVOPTs) and loop iteration analysis, incorrectly assumed pointer types never wrap. This commit updates tree-ssa-loop-niter.cc to properly honor the -fwrapv-pointer flag, ensuring that pointer arithmetic is analyzed with the correct wrapping semantics. Two test cases are added to verify this correction.