Landing: 549ec717abb7

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Project / Subsystem

gcc / testsuite

Date

2026-09-14

Author

Iain Sandoe

Commit

549ec717abb79c26186af06e01c937b4613c79ba

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: testsuite
patch_id: —
commit_hash: 549ec717abb79c26186af06e01c937b4613c79ba
source_type: github
headline: Darwin testsuite queries kernel for AVX512 availability.
tldr: Darwin testsuite now queries the kernel for AVX512 support instead of relying on XCR0.
author: Iain Sandoe
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • testsuite
• x86
• Darwin
• AVX512
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/549ec717abb79c26186af06e01c937b4613c79ba
date: 2026-09-14T00:00:00.000Z

The GCC testsuite on Darwin now correctly checks for AVX512 availability by querying the kernel directly. This is because Darwin enables AVX512 state lazily, making a direct read of XCR0 unreliable during constructor calls. This change ensures the testsuite accurately reflects hardware capabilities.