Landing: 9d60af6d3e3b
Project / Subsystem
gcc / gcc/i386
Date
2026-05-05
Author
Jakub Jelinek
Commit
9d60af6d3e3bcaf37f44312569e15163af2ec598
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- gcc/i386
- patch_id
- —
- commit_hash
- 9d60af6d3e3bcaf37f44312569e15163af2ec598
- source_type
- github
- headline
- i386: Don't split volatile memory tests into 8-bit tests.
- tldr
- Avoids undesirable splitting of 16/32-bit volatile memory tests into 8-bit tests when `-ffuse-ops-with-volatile-access` is enabled.
- author
- Jakub Jelinek
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • i386
- • volatile
- • optimization
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-05-05T00:00:00.000Z
When -ffuse-ops-with-volatile-access is enabled, the compiler could split 16 or 32-bit volatile memory tests into 8-bit volatile memory tests. This change prevents this splitting, as it can lead to misbehavior, especially when accessing memory-mapped hardware registers. A new test case is added to verify the fix.