[PATCH 10/46] s390: Improve coding of .insn pseudo-mnemonics without operands

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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

• Slightly more flexible syntax.
• Backward compatible, existing code with trailing comma still works.

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All attributes

project: binutils
subsystem: s390
patch_id: —
discussion_id: 20261005153947.363053-58-jremus@linux.ibm.com
source_type: public_inbox
title: [PATCH 10/46] s390: Improve coding of .insn pseudo-mnemonics without operands
headline: s390: Improve coding of .insn pseudo-mnemonics without operands
tldr: Allows omitting the trailing comma in .insn pseudo-mnemonics when all operands are optional, improving syntax for s390 assembly.
proposer: Jens Remus <jremus@linux.ibm.com>
consensus: Proposed
outcome: proposed
sentiment_score: —
technical_tradeoffs: • Slightly more flexible syntax.
• Backward compatible, existing code with trailing comma still works.
series_id: binutils:s390: improve coding of .insn pseudo-mnemonics without operands
series_role: reply
series_parts: []
tags: • binutils
• gas
• s390
• assembler
• syntax
url: https://inbox.sourceware.org/binutils/20261005153947.363053-58-jremus@linux.ibm.com
bugzilla_url: —
date: 2026-10-05T00:00:00.000Z

[PATCH 10/46] s390: Improve coding of .insn pseudo-mnemonics without operands

This patch enhances the s390 assembler’s handling of the .insn pseudo-mnemonic by allowing the omission of the trailing comma when all operands are optional and none are provided. Previously, a trailing comma was required even when no operands were specified (e.g., .insn INSN-FMT,OPCODE,). The change simplifies the syntax to .insn INSN-FMT,OPCODE, making it more natural and aligning with future changes to make all operands optional for rre and s mnemonics. It also generalizes the logic for handling .insn mnemonics with no operands.