1 // Copyright 2018 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
5 // +build 386 amd64 amd64p32
9 const cacheLineSize = 64
14 maxID, _, _, _ := cpuid(0, 0)
20 _, _, ecx1, edx1 := cpuid(1, 0)
21 X86.HasSSE2 = isSet(26, edx1)
23 X86.HasSSE3 = isSet(0, ecx1)
24 X86.HasPCLMULQDQ = isSet(1, ecx1)
25 X86.HasSSSE3 = isSet(9, ecx1)
26 X86.HasFMA = isSet(12, ecx1)
27 X86.HasSSE41 = isSet(19, ecx1)
28 X86.HasSSE42 = isSet(20, ecx1)
29 X86.HasPOPCNT = isSet(23, ecx1)
30 X86.HasAES = isSet(25, ecx1)
31 X86.HasOSXSAVE = isSet(27, ecx1)
32 X86.HasRDRAND = isSet(30, ecx1)
34 osSupportsAVX := false
35 // For XGETBV, OSXSAVE bit is required and sufficient.
38 // Check if XMM and YMM registers have OS support.
39 osSupportsAVX = isSet(1, eax) && isSet(2, eax)
42 X86.HasAVX = isSet(28, ecx1) && osSupportsAVX
48 _, ebx7, _, _ := cpuid(7, 0)
49 X86.HasBMI1 = isSet(3, ebx7)
50 X86.HasAVX2 = isSet(5, ebx7) && osSupportsAVX
51 X86.HasBMI2 = isSet(8, ebx7)
52 X86.HasERMS = isSet(9, ebx7)
53 X86.HasRDSEED = isSet(18, ebx7)
54 X86.HasADX = isSet(19, ebx7)
57 func isSet(bitpos uint, value uint32) bool {
58 return value&(1<<bitpos) != 0