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cpu: roll back "use IsProcessorFeaturePresent to calculate ARM64 on windows"

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Roll back CL 740880 (commit fc646e489f)
because it adds a golang.org/x/sys/windows import to the cpu package.
The cpu package is vendored into the main Go tree and the policy there
does not currently permit this dependency.

For golang/go#76791.
Fixes golang/go#78259.

Change-Id: I72860cdf98192f4cbd2b3398926203a752d8d0fe
Cq-Include-Trybots: luci.golang.try:x_sys-gotip-windows-arm64
Reviewed-on: https://go-review.googlesource.com/c/sys/+/757482
Reviewed-by: Michael Pratt <mpratt@google.com>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
This commit is contained in:
Dmitri Shuralyov
2026-03-20 13:12:12 -07:00
committed by Gopher Robot
parent eaaaaee1dc
commit a76ec62d6c
2 changed files with 1 additions and 43 deletions
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cpu/cpu_other_arm64.go
+1 -1
View File
@@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build !darwin && !linux && !netbsd && !openbsd && !windows && arm64
//go:build !darwin && !linux && !netbsd && !openbsd && arm64
package cpu
cpu/cpu_windows_arm64.go
-42
View File
@@ -1,42 +0,0 @@
// Copyright 2026 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cpu
import (
"golang.org/x/sys/windows"
)
func doinit() {
// set HasASIMD and HasFP to true as per
// https://learn.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=msvc-170#base-requirements
//
// The ARM64 version of Windows always presupposes that it's running on an ARMv8 or later architecture.
// Both floating-point and NEON support are presumed to be present in hardware.
//
ARM64.HasASIMD = true
ARM64.HasFP = true
if windows.IsProcessorFeaturePresent(windows.PF_ARM_V8_CRYPTO_INSTRUCTIONS_AVAILABLE) {
ARM64.HasAES = true
ARM64.HasPMULL = true
ARM64.HasSHA1 = true
ARM64.HasSHA2 = true
}
ARM64.HasSHA3 = windows.IsProcessorFeaturePresent(windows.PF_ARM_SHA3_INSTRUCTIONS_AVAILABLE)
ARM64.HasCRC32 = windows.IsProcessorFeaturePresent(windows.PF_ARM_V8_CRC32_INSTRUCTIONS_AVAILABLE)
ARM64.HasSHA512 = windows.IsProcessorFeaturePresent(windows.PF_ARM_SHA512_INSTRUCTIONS_AVAILABLE)
ARM64.HasATOMICS = windows.IsProcessorFeaturePresent(windows.PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE)
if windows.IsProcessorFeaturePresent(windows.PF_ARM_V82_DP_INSTRUCTIONS_AVAILABLE) {
ARM64.HasASIMDDP = true
ARM64.HasASIMDRDM = true
}
if windows.IsProcessorFeaturePresent(windows.PF_ARM_V83_LRCPC_INSTRUCTIONS_AVAILABLE) {
ARM64.HasLRCPC = true
ARM64.HasSM3 = true
}
ARM64.HasSVE = windows.IsProcessorFeaturePresent(windows.PF_ARM_SVE_INSTRUCTIONS_AVAILABLE)
ARM64.HasSVE2 = windows.IsProcessorFeaturePresent(windows.PF_ARM_SVE2_INSTRUCTIONS_AVAILABLE)
ARM64.HasJSCVT = windows.IsProcessorFeaturePresent(windows.PF_ARM_V83_JSCVT_INSTRUCTIONS_AVAILABLE)
}