src/internal/cpu/cpu.go

// Copyright 2017 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 implements processor feature detection
// used by the Go standard library.
package cpu

var X86 x86

// The booleans in x86 contain the correspondingly named cpuid feature bit.
// HasAVX and HasAVX2 are only set if the OS does support XMM and YMM registers
// in addition to the cpuid feature bit being set.
// The struct is padded to avoid false sharing.
type x86 struct {
	_            [CacheLineSize]byte
	HasAES       bool
	HasAVX       bool
	HasAVX2      bool
	HasBMI1      bool
	HasBMI2      bool
	HasERMS      bool
	HasOSXSAVE   bool
	HasPCLMULQDQ bool
	HasPOPCNT    bool
	HasSSE2      bool
	HasSSE3      bool
	HasSSSE3     bool
	HasSSE41     bool
	HasSSE42     bool
	_            [CacheLineSize]byte
}

var PPC64 ppc64

// For ppc64x, it is safe to check only for ISA level starting on ISA v3.00,
// since there are no optional categories. There are some exceptions that also
// require kernel support to work (darn, scv), so there are capability bits for
// those as well. The minimum processor requirement is POWER8 (ISA 2.07), so we
// maintain some of the old capability checks for optional categories for
// safety.
// The struct is padded to avoid false sharing.
type ppc64 struct {
	_          [CacheLineSize]byte
	HasVMX     bool // Vector unit (Altivec)
	HasDFP     bool // Decimal Floating Point unit
	HasVSX     bool // Vector-scalar unit
	HasHTM     bool // Hardware Transactional Memory
	HasISEL    bool // Integer select
	HasVCRYPTO bool // Vector cryptography
	HasHTMNOSC bool // HTM: kernel-aborted transaction in syscalls
	HasDARN    bool // Hardware random number generator (requires kernel enablement)
	HasSCV     bool // Syscall vectored (requires kernel enablement)
	IsPOWER8   bool // ISA v2.07 (POWER8)
	IsPOWER9   bool // ISA v3.00 (POWER9)
	_          [CacheLineSize]byte
}