cpu: roll back "use IsProcessorFeaturePresent to calculate ARM64 on windows" Roll back CL 740880 (commit fc646e489fd944b6f77d327ab77f1a4bab81d5ad) 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>
diff --git a/cpu/cpu_other_arm64.go b/cpu/cpu_other_arm64.go index 6c7c5bf..53f814d 100644 --- a/cpu/cpu_other_arm64.go +++ b/cpu/cpu_other_arm64.go
@@ -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
diff --git a/cpu/cpu_windows_arm64.go b/cpu/cpu_windows_arm64.go deleted file mode 100644 index d09e85a..0000000 --- a/cpu/cpu_windows_arm64.go +++ /dev/null
@@ -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) -}