mirror of
https://github.com/refraction-networking/utls.git
synced 2025-04-06 21:47:36 +03:00
538b437590
Use constant masks and align the definition of isSet with arm64 and ppc64x. Change-Id: I0c6eae30da5e3ce797cde0dab4a39855d4d245d9 Reviewed-on: https://go-review.googlesource.com/94759 Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
85 lines
2 KiB
Go
85 lines
2 KiB
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 amd64p32
|
|
|
|
package cpu
|
|
|
|
const CacheLineSize = 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() {
|
|
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
|
|
}
|