Landing: 9f7a095e81bd
Project / Subsystem
gcc / gcc
Date
2026-10-01
Author
Richard Biener
Commit
9f7a095e81bd3bafbc0fd66ab210a962ff32a801
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- 9f7a095e81bd3bafbc0fd66ab210a962ff32a801
- source_type
- github
- headline
- Fix missed constant folding of _BitInt return values.
- tldr
- GCC can now constant fold functions returning _BitInt types by checking the return type instead of the mode.
- author
- Richard Biener
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • optimization
- • compiler
- • type system
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-10-01T00:00:00.000Z
This commit resolves an issue where GCC failed to constant fold functions returning _BitInt types. The problem stemmed from a check that incorrectly used SCALAR_INT_MODE_P on BLKmode, which does not apply to _BitInt. The fix replaces this mode check with a direct check of the return type, enabling constant folding for these types and a new test case verifies the correction.