Landing: 5c39eb48884a
Project / Subsystem
binutils / s390
Date
2026-10-02
Author
Jens Remus <jremus@sourceware.org>
Commit
5c39eb48884aaca74bdd9214dd5f173d2d337760
Source
public_inbox
Perf win
No
Breaking
No
All attributes
- project
- binutils
- subsystem
- s390
- patch_id
- —
- commit_hash
- 5c39eb48884aaca74bdd9214dd5f173d2d337760
- source_type
- public_inbox
- headline
- s390: Enforce register constraints for km/kmc instructions
- tldr
- Assembler now enforces register constraints for s390 km and kmc instructions.
- author
- Jens Remus <jremus@sourceware.org>
- outcome
- committed
- performance_win
- false
- breaking_change
- false
- series_id
- —
- series_parts
- []
- tags
-
- • s390
- • assembler
- • architecture
- discussion_id_link
- —
- bugzilla_pr
- —
- date
- 2026-10-02T00:00:00.000Z
This commit updates the s390 assembler to enforce architectural constraints on the register operands for the km and kmc instructions. It ensures that R1 designates an even-numbered register (not 0) and R2 designates an even-odd pair of general registers (also not 0), preventing specification exceptions.