| // Copyright 2018 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 amd64p32 |
| |
| package cpu |
| |
| import "runtime" |
| |
| const cacheLineSize = 64 |
| |
| func initOptions() { |
| 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: "osxsave", Feature: &X86.HasOSXSAVE}, |
| {Name: "pclmulqdq", Feature: &X86.HasPCLMULQDQ}, |
| {Name: "popcnt", Feature: &X86.HasPOPCNT}, |
| {Name: "rdrand", Feature: &X86.HasRDRAND}, |
| {Name: "rdseed", Feature: &X86.HasRDSEED}, |
| {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: runtime.GOARCH == "amd64"}, |
| } |
| } |
| |
| func archInit() { |
| |
| Initialized = true |
| |
| maxID, _, _, _ := cpuid(0, 0) |
| |
| if maxID < 1 { |
| return |
| } |
| |
| _, _, ecx1, edx1 := cpuid(1, 0) |
| X86.HasSSE2 = isSet(26, edx1) |
| |
| X86.HasSSE3 = isSet(0, ecx1) |
| X86.HasPCLMULQDQ = isSet(1, ecx1) |
| X86.HasSSSE3 = isSet(9, ecx1) |
| X86.HasFMA = isSet(12, ecx1) |
| X86.HasSSE41 = isSet(19, ecx1) |
| X86.HasSSE42 = isSet(20, ecx1) |
| X86.HasPOPCNT = isSet(23, ecx1) |
| X86.HasAES = isSet(25, ecx1) |
| X86.HasOSXSAVE = isSet(27, ecx1) |
| X86.HasRDRAND = isSet(30, ecx1) |
| |
| 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(1, eax) && isSet(2, eax) |
| } |
| |
| X86.HasAVX = isSet(28, ecx1) && osSupportsAVX |
| |
| if maxID < 7 { |
| return |
| } |
| |
| _, ebx7, _, _ := cpuid(7, 0) |
| X86.HasBMI1 = isSet(3, ebx7) |
| X86.HasAVX2 = isSet(5, ebx7) && osSupportsAVX |
| X86.HasBMI2 = isSet(8, ebx7) |
| X86.HasERMS = isSet(9, ebx7) |
| X86.HasRDSEED = isSet(18, ebx7) |
| X86.HasADX = isSet(19, ebx7) |
| |
| } |
| |
| func isSet(bitpos uint, value uint32) bool { |
| return value&(1<<bitpos) != 0 |
| } |