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- // 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
-
- const cacheLineSize = 64
-
- func init() {
- 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)
-
- 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.HasADX = isSet(19, ebx7)
- }
-
- func isSet(bitpos uint, value uint32) bool {
- return value&(1<<bitpos) != 0
- }
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