Landing: 00f6d24737cd
Project / Subsystem
gcc / cselib
Date
2026-07-09
Author
Richard Sandiford
Commit
00f6d24737cd35594dcd621aae412d0d41258370
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- cselib
- patch_id
- —
- commit_hash
- 00f6d24737cd35594dcd621aae412d0d41258370
- source_type
- github
- headline
- 32-bit hash restored for cselib values
- tldr
- GCC restores a 32-bit hash for cselib values, resolving a bug that caused lookups to fail by relocating the UID field.
- author
- Richard Sandiford
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • cselib
- • optimization
- • bugfix
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-09T00:00:00.000Z
GCC restores the hash used in the common subexpression elimination library (cselib) to 32 bits, fixing a bug where trimming the hash to 30 bits caused zero values to be returned, leading to lookup failures. The space for the 32-bit hash is reclaimed by moving the UID field to a different RTX union member, simplifying some operations while slightly complicating others.