Gecko [ 167.86.127.34 ]

Name	Size	Permission
cpu.go	7.02 KB	-rw-r--r--
cpu_386.go	194 B	-rw-r--r--
cpu_amd64.go	196 B	-rw-r--r--
cpu_arm.go	882 B	-rw-r--r--
cpu_arm64.go	3.38 KB	-rw-r--r--
cpu_mips.go	201 B	-rw-r--r--
cpu_mips64.go	201 B	-rw-r--r--
cpu_mips64le.go	201 B	-rw-r--r--
cpu_mipsle.go	201 B	-rw-r--r--
cpu_no_init.go	309 B	-rw-r--r--
cpu_ppc64x.go	1.36 KB	-rw-r--r--
cpu_riscv64.go	201 B	-rw-r--r--
cpu_s390x.go	5.75 KB	-rw-r--r--
cpu_s390x.s	2.2 KB	-rw-r--r--
cpu_s390x_test.go	1.44 KB	-rw-r--r--
cpu_test.go	1.69 KB	-rw-r--r--
cpu_wasm.go	201 B	-rw-r--r--
cpu_x86.go	2.69 KB	-rw-r--r--
cpu_x86.s	576 B	-rw-r--r--
cpu_x86_test.go	1.25 KB	-rw-r--r--
export_test.go	200 B	-rw-r--r--

Code Editor : cpu_x86.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.

// +build 386 amd64

package cpu

const CacheLinePadSize = 64

// cpuid is implemented in cpu_x86.s.
func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)

// xgetbv with ecx = 0 is implemented in cpu_x86.s.
func xgetbv() (eax, edx uint32)

const (
	// edx bits
	cpuid_SSE2 = 1 << 26

// ecx bits
	cpuid_SSE3      = 1 << 0
	cpuid_PCLMULQDQ = 1 << 1
	cpuid_SSSE3     = 1 << 9
	cpuid_FMA       = 1 << 12
	cpuid_SSE41     = 1 << 19
	cpuid_SSE42     = 1 << 20
	cpuid_POPCNT    = 1 << 23
	cpuid_AES       = 1 << 25
	cpuid_OSXSAVE   = 1 << 27
	cpuid_AVX       = 1 << 28

// ebx bits
	cpuid_BMI1 = 1 << 3
	cpuid_AVX2 = 1 << 5
	cpuid_BMI2 = 1 << 8
	cpuid_ERMS = 1 << 9
	cpuid_ADX  = 1 << 19
)

func doinit() {
	options = []option{
		{Name: "adx", Feature: &X86.HasADX},
		{Name: "aes", Feature: &X86.HasAES},
		{Name: "avx", Feature: &X86.HasAVX},
		{Name: "avx2", Feature: &X86.HasAVX2},
		{Name: "bmi1", Feature: &X86.HasBMI1},
		{Name: "bmi2", Feature: &X86.HasBMI2},
		{Name: "erms", Feature: &X86.HasERMS},
		{Name: "fma", Feature: &X86.HasFMA},
		{Name: "pclmulqdq", Feature: &X86.HasPCLMULQDQ},
		{Name: "popcnt", Feature: &X86.HasPOPCNT},
		{Name: "sse3", Feature: &X86.HasSSE3},
		{Name: "sse41", Feature: &X86.HasSSE41},
		{Name: "sse42", Feature: &X86.HasSSE42},
		{Name: "ssse3", Feature: &X86.HasSSSE3},

// These capabilities should always be enabled on amd64:
		{Name: "sse2", Feature: &X86.HasSSE2, Required: GOARCH == "amd64"},
	}

maxID, _, _, _ := cpuid(0, 0)

if maxID < 1 {
		return
	}

_, _, ecx1, edx1 := cpuid(1, 0)
	X86.HasSSE2 = isSet(edx1, cpuid_SSE2)

X86.HasSSE3 = isSet(ecx1, cpuid_SSE3)
	X86.HasPCLMULQDQ = isSet(ecx1, cpuid_PCLMULQDQ)
	X86.HasSSSE3 = isSet(ecx1, cpuid_SSSE3)
	X86.HasFMA = isSet(ecx1, cpuid_FMA)
	X86.HasSSE41 = isSet(ecx1, cpuid_SSE41)
	X86.HasSSE42 = isSet(ecx1, cpuid_SSE42)
	X86.HasPOPCNT = isSet(ecx1, cpuid_POPCNT)
	X86.HasAES = isSet(ecx1, cpuid_AES)
	X86.HasOSXSAVE = isSet(ecx1, cpuid_OSXSAVE)

osSupportsAVX := false
	// For XGETBV, OSXSAVE bit is required and sufficient.
	if X86.HasOSXSAVE {
		eax, _ := xgetbv()
		// Check if XMM and YMM registers have OS support.
		osSupportsAVX = isSet(eax, 1<<1) && isSet(eax, 1<<2)
	}

X86.HasAVX = isSet(ecx1, cpuid_AVX) && osSupportsAVX

if maxID < 7 {
		return
	}

_, ebx7, _, _ := cpuid(7, 0)
	X86.HasBMI1 = isSet(ebx7, cpuid_BMI1)
	X86.HasAVX2 = isSet(ebx7, cpuid_AVX2) && osSupportsAVX
	X86.HasBMI2 = isSet(ebx7, cpuid_BMI2)
	X86.HasERMS = isSet(ebx7, cpuid_ERMS)
	X86.HasADX = isSet(ebx7, cpuid_ADX)
}

func isSet(hwc uint32, value uint32) bool {
	return hwc&value != 0
}

${this.title}

Code Editor : cpu_x86.go