Landing: db655b1fdce5

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Project / Subsystem

gcc / amdgcn

Date

2026-09-17

Author

Andrew Stubbs

Commit

db655b1fdce54adaf3d983ad73dd02db6cbdedf8

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: amdgcn
patch_id: —
commit_hash: db655b1fdce54adaf3d983ad73dd02db6cbdedf8
source_type: github
headline: amdgcn: Handle XNACK in pre-split mov instructions
tldr: Ensures load instructions on AMD GPUs handle XNACK correctly even before splitting.
author: Andrew Stubbs
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • amdgcn
• gpu
• hardware
• driver
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/db655b1fdce54adaf3d983ad73dd02db6cbdedf8
date: 2026-09-17T00:00:00.000Z

This commit addresses a latent bug in the AMD GCN (Graphics Core Next) backend by ensuring that load instructions are restartable and marked as no-clobber when XNACK is enabled. This is necessary even for instructions that will be split later, guaranteeing correct behavior in the presence of XNACK acknowledgments.