Landing: 2db2cf62f1ad
Project / Subsystem
gcc / risc-v
Date
2026-07-15
Author
Jin Ma
Commit
2db2cf62f1ad2788365b1898aefdba2fa76aab87
Source
github
Perf win
No
Breaking
No
All attributes
- project
- gcc
- subsystem
- risc-v
- patch_id
- —
- commit_hash
- 2db2cf62f1ad2788365b1898aefdba2fa76aab87
- source_type
- github
- headline
- RISC-V: Avoid frame-pointer references in epilogue stack ties
- tldr
- Prevents incorrect frame pointer usage in RISC-V epilogues, avoiding register corruption during unwinding.
- author
- Jin Ma
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • risc-v
- • debugging
- • unwinding
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-07-15T00:00:00.000Z
This commit addresses an issue in the RISC-V backend where epilogue stack ties incorrectly referenced the frame pointer (s0) when no frame pointer was used. This made the register appear live, potentially leading to regrename corrupting callee-saved state during exception unwinding. The fix introduces a new SP-only pattern for epilogue barriers, ensuring stack ties correctly reference only the stack pointer when a frame pointer is absent, thus preserving unwinding integrity.