[sys] cpu: better defaults on darwin ARM64

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Gopher Robot (Gerrit)

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Feb 12, 2026, 12:29:39 PM (18 hours ago) Feb 12

to Gerrit Bot, goph...@pubsubhelper.golang.org, golang-...@googlegroups.com, Junyang Shao, Keith Randall, Keith Randall, Nuno Cruces, Go LUCI, golang-co...@googlegroups.com

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Change information

Commit message:

cpu: better defaults on darwin ARM64

This is motivated by
https://github.com/wazero/wazero/pull/2473
which needs to special case darwin for testing the availability of
HasATOMICS, although all M-series CPUs support it.

We could do sysctlbyname, like syscall_darwin_x86_gc.go, if that's
preferred:
https://developer.apple.com/documentation/kernel/1387446-sysctlbyname/determining_instruction_set_characteristics

Change-Id: I0f5ea55ef5cda4956db44b2d40f2f10044fa3321

GitHub-Last-Rev: d5d0f1e989579de2a25c97c00c7e9db5d4b0cb29

GitHub-Pull-Request: golang/sys#267

Reviewed-on: https://go-review.googlesource.com/c/sys/+/743320

Auto-Submit: Keith Randall <k...@golang.org>

Reviewed-by: Keith Randall <k...@golang.org>

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Reviewed-by: Keith Randall <k...@google.com>

Reviewed-by: Junyang Shao <shaoj...@google.com>

Files:

M cpu/cpu_arm64.go
A cpu/cpu_darwin_arm64.go
M cpu/cpu_gccgo_arm64.go
M cpu/cpu_other_arm64.go

Change size: S

Delta: 4 files changed, 34 insertions(+), 8 deletions(-)

Branch: refs/heads/master

Submit Requirements:

Code-Review: +1 by Keith Randall, +2 by Keith Randall, +1 by Junyang Shao
TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI

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