mirror of
https://github.com/go-gitea/gitea
synced 2024-11-05 09:44:26 +00:00
60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
// 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() {
|
|
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
|
|
}
|