Landing: 4bb47c013d8f

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Project / Subsystem

gcc / aarch64

Date

2026-09-15

Author

Richard Earnshaw

Commit

4bb47c013d8fd815c6abe592f36f5c7547e0ed61

Source

github

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Breaking

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All attributes

project: gcc
subsystem: aarch64
patch_id: —
commit_hash: 4bb47c013d8fd815c6abe592f36f5c7547e0ed61
source_type: github
headline: aarch64: Handle subregister operands for negvti3
tldr: Fixes a crash in negvti3 when operands are subregisters by introducing a new predicate.
author: Richard Earnshaw
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • aarch64
• codegen
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/4bb47c013d8fd815c6abe592f36f5c7547e0ed61
date: 2026-09-15T00:00:00.000Z

The negvti3 instruction on aarch64 previously crashed when given subregister operands because the gen_highpart function does not support them. This change introduces a new predicate, pure_register_operand, and uses it in negvti3 to prevent subregister operands, thus avoiding the crash.