From adf21a9b56f3498385152d701ddd0e8679fe57ed Mon Sep 17 00:00:00 2001
From: fanzha02 <fannie.zhang@arm.com>
Date: Mon, 7 Apr 2025 10:12:06 +0000
Subject: [PATCH] internal/cpu: add a detection for Neoverse(N3, V3, V3ae)
cores
The memmove implementation relies on the variable
runtime.arm64UseAlignedLoads to select fastest code
path. Considering Neoverse N3, V3 and V3ae cores
prefer aligned loads, this patch adds code to detect
them for memmove performance.
Change-Id: I7266fc35d8b2c15ff516c592b987bafacb82b620
Reviewed-on: https://go-review.googlesource.com/c/go/+/664038
Reviewed-by: Cherry Mui <cherryyz@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
---
src/internal/cpu/cpu_arm64_hwcap.go | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/src/internal/cpu/cpu_arm64_hwcap.go b/src/internal/cpu/cpu_arm64_hwcap.go
index cdc1d89c9e4..e6711ae275a 100644
--- a/src/internal/cpu/cpu_arm64_hwcap.go
+++ b/src/internal/cpu/cpu_arm64_hwcap.go
@@ -67,9 +67,14 @@ func hwcapInit(os string) {
// d40 - NeoverseV1
// d49 - NeoverseN2
// d4f - NeoverseV2
- if implementer == 'A' && (part_num == 0xd0c || part_num == 0xd40 ||
- part_num == 0xd49 || part_num == 0xd4f) {
- ARM64.IsNeoverse = true
+ // d8e - NeoverseN3
+ // d84 - NeoverseV3
+ // d83 - NeoverseV3ae
+ if implementer == 'A' {
+ switch part_num {
+ case 0xd0c, 0xd40, 0xd49, 0xd4f, 0xd8e, 0xd84, 0xd83:
+ ARM64.IsNeoverse = true
+ }
}
}
}
--
GitLab