Landing: ea962c82c1d8
Project / Subsystem
gcc / gcc
Date
2026-06-08
Author
Jakub Jelinek
Commit
ea962c82c1d886aea6ccee81c4ba3a4a3fb7ed85
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc
- patch_id
- —
- commit_hash
- ea962c82c1d886aea6ccee81c4ba3a4a3fb7ed85
- source_type
- github
- headline
- C: Fix up ICE with __builtin_{bswap,bitreverse}g
- tldr
- GCC no longer crashes when processing `__builtin_bswapg` and `__builtin_bitreverseg` with non-folded arguments.
- author
- Jakub Jelinek
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • c
- • bugfix
- • builtins
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-06-08T00:00:00.000Z
This commit resolves an Internal Compiler Error (ICE) that occurred in GCC when processing __builtin_bswapg and __builtin_bitreverseg builtins with arguments that hadn’t been fully folded. Previously, the compiler would crash because it expected a folded argument before calling fold_build_builtin_bswapg_bitreverseg. The fix now ensures that c_fully_fold is called on the argument before the builtin construction, preventing the ICE and improving compiler stability for C code using these operations.