[PATCH 12/46] s390: Add .insn pseudo-mnemonic i

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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

• Removal of the RR_U0 format might affect older codebases expecting it, though it's marked as deprecated.
• Ensuring correct mapping between the pseudo-mnemonic and the underlying instruction format.

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All attributes

project: binutils
subsystem: s390
patch_id: —
discussion_id: 20261005153947.363053-60-jremus@linux.ibm.com
source_type: public_inbox
title: [PATCH 12/46] s390: Add .insn pseudo-mnemonic i
headline: s390: Add .insn pseudo-mnemonic i
tldr: Adds support for the .insn i pseudo-mnemonic in the s390 assembler and updates the svc instruction to use the new I_U format.
proposer: Jens Remus <jremus@linux.ibm.com>
consensus: Proposed
outcome: proposed
sentiment_score: —
technical_tradeoffs: • Removal of the RR_U0 format might affect older codebases expecting it, though it's marked as deprecated.
• Ensuring correct mapping between the pseudo-mnemonic and the underlying instruction format.
series_id: binutils:s390: add .insn pseudo-mnemonic i
series_role: reply
series_parts: []
tags: • s390
• gas
• assembler
• instruction-formats
• documentation
url: https://inbox.sourceware.org/binutils/20261005153947.363053-60-jremus@linux.ibm.com
bugzilla_url: —
date: 2026-10-05T00:00:00.000Z

[PATCH 12/46] s390: Add .insn pseudo-mnemonic i

This patch introduces the ‘.insn i’ pseudo-mnemonic for the s390 architecture in the GNU Assembler. It defines the I_U instruction format, removes the deprecated RR_U0 format, and modifies the ‘svc’ instruction to utilize the new I_U format, aligning it with the z/Architecture Principles of Operation. Test cases are added for both ESA/390 and z/Architecture.