Landing: 73680e030d24
Project / Subsystem
gcc / ipa
Date
2026-09-02
Author
Richard Biener
Commit
73680e030d24d966121f608d7611848d75ae8045
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- ipa
- patch_id
- —
- commit_hash
- 73680e030d24d966121f608d7611848d75ae8045
- source_type
- github
- headline
- IPA: Require matching precision for VIEW_CONVERT_EXPR with known values
- tldr
- IPA: Fixes incorrect bitfield interpretation on big-endian targets by ensuring type precision matches for VIEW_CONVERT_EXPR.
- author
- Richard Biener
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • ipa
- • endianness
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-09-02T00:00:00.000Z
This commit addresses an issue in the IPA pass where VIEW_CONVERT_EXPR was folding aggregate constants with differing type precisions. When a bit-field and its containing byte had the same TYPE_SIZE but different TYPE_PRECISION, the conversion could lead to incorrect values, especially on big-endian systems. The change requires matching precision between the aggregate constant and the condition’s type, preventing misinterpretation and ensuring correct predicate evaluation.