Landing: d5a076158aa3

← All landings

Project / Subsystem

gcc / aarch64

Date

2026-09-18

Author

Richard Ball

Commit

d5a076158aa3da594bc845b8363264d8fcec4a5e

Source

github

Perf win

Yes

Breaking

View on GitHub →

All attributes

project: gcc
subsystem: aarch64
patch_id: —
commit_hash: d5a076158aa3da594bc845b8363264d8fcec4a5e
source_type: github
headline: aarch64: Add support for FEAT_CMH atomic store intrinsics
tldr: AArch64 support added for atomic store operations with hints using FEAT_CMH extension.
author: Richard Ball
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • aarch64
• atomic-operations
• intrinsics
• FEAT_CMH
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/d5a076158aa3da594bc845b8363264d8fcec4a5e
date: 2026-09-18T00:00:00.000Z

The AArch64 compiler support has been updated to include atomic store intrinsics that utilize hints from the FEAT_CMH extension. The existing atomic_store_with_stshh has been generalized to atomic_store_with_hint, allowing it to accommodate new hints like STCPH. This enhancement aims to improve performance for atomic store operations.