go/src/internal/cpu/cpu_loong64_hwcap.go

// Copyright 2023 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.

//go:build loong64 && linux

package cpu

// This is initialized by archauxv and should not be changed after it is
// initialized.
var HWCap uint

// HWCAP bits. These are exposed by the Linux kernel.
const (
	hwcap_LOONGARCH_LSX  = 1 << 4
	hwcap_LOONGARCH_LASX = 1 << 5
)

func hwcapInit() {
	// TODO: Features that require kernel support like LSX and LASX can
	// be detected here once needed in std library or by the compiler.
	Loong64.HasLSX = hwcIsSet(HWCap, hwcap_LOONGARCH_LSX)
	Loong64.HasLASX = hwcIsSet(HWCap, hwcap_LOONGARCH_LASX)
}

func hwcIsSet(hwc uint, val uint) bool {
	return hwc&val != 0
}