[PATCH 19/46] s390: Make R2 operand optional in .insn pseudo-mnemonic rr
Project / Subsystem
binutils / s390
Date
2026-10-05
Proposer
Jens Remus <jremus@linux.ibm.com>
Source type
public_inbox
Consensus
Proposed
Sentiment
—/10
Technical tradeoffs
- • Increases assembler flexibility by allowing more compact instruction representations.
- • Requires careful testing to ensure correct parsing of both present and absent R2 operands.
All attributes
- project
- binutils
- subsystem
- s390
- patch_id
- —
- discussion_id
- 20261005153947.363053-67-jremus@linux.ibm.com
- source_type
- public_inbox
- title
- [PATCH 19/46] s390: Make R2 operand optional in .insn pseudo-mnemonic rr
- headline
- s390: Make R2 operand optional in .insn pseudo-mnemonic rr
- tldr
- Makes the R2 operand optional for the .insn rr pseudo-mnemonic in the s390 assembler.
- proposer
- Jens Remus <jremus@linux.ibm.com>
- consensus
- Proposed
- outcome
- proposed
- sentiment_score
- —
- technical_tradeoffs
-
- • Increases assembler flexibility by allowing more compact instruction representations.
- • Requires careful testing to ensure correct parsing of both present and absent R2 operands.
- series_id
- binutils:s390: make r2 operand optional in .insn pseudo-mnemonic rr
- series_role
- reply
- series_parts
- []
- tags
-
- • s390
- • assembler
- • instruction-format
- • optional-operand
- bugzilla_url
- —
- date
- 2026-10-05T00:00:00.000Z
[PATCH 19/46] s390: Make R2 operand optional in .insn pseudo-mnemonic rr
This patch modifies the s390 assembler’s handling of the .insn rr pseudo-mnemonic to make the R2 operand optional. This aligns with the RR instruction format’s optional R2 field. The changes include documentation updates and new test cases for both ESA/390 and z/Architecture operand formats.