88 lines
2.2 KiB
Go
Vendored
88 lines
2.2 KiB
Go
Vendored
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build 386 amd64 amd64p32
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package cpu
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import "runtime"
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const cacheLineSize = 64
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func initOptions() {
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options = []option{
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{Name: "adx", Feature: &X86.HasADX},
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{Name: "aes", Feature: &X86.HasAES},
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{Name: "avx", Feature: &X86.HasAVX},
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{Name: "avx2", Feature: &X86.HasAVX2},
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{Name: "bmi1", Feature: &X86.HasBMI1},
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{Name: "bmi2", Feature: &X86.HasBMI2},
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{Name: "erms", Feature: &X86.HasERMS},
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{Name: "fma", Feature: &X86.HasFMA},
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{Name: "osxsave", Feature: &X86.HasOSXSAVE},
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{Name: "pclmulqdq", Feature: &X86.HasPCLMULQDQ},
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{Name: "popcnt", Feature: &X86.HasPOPCNT},
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{Name: "rdrand", Feature: &X86.HasRDRAND},
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{Name: "rdseed", Feature: &X86.HasRDSEED},
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{Name: "sse3", Feature: &X86.HasSSE3},
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{Name: "sse41", Feature: &X86.HasSSE41},
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{Name: "sse42", Feature: &X86.HasSSE42},
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{Name: "ssse3", Feature: &X86.HasSSSE3},
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// These capabilities should always be enabled on amd64:
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{Name: "sse2", Feature: &X86.HasSSE2, Required: runtime.GOARCH == "amd64"},
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}
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}
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func archInit() {
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Initialized = true
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maxID, _, _, _ := cpuid(0, 0)
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if maxID < 1 {
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return
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}
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_, _, ecx1, edx1 := cpuid(1, 0)
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X86.HasSSE2 = isSet(26, edx1)
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X86.HasSSE3 = isSet(0, ecx1)
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X86.HasPCLMULQDQ = isSet(1, ecx1)
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X86.HasSSSE3 = isSet(9, ecx1)
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X86.HasFMA = isSet(12, ecx1)
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X86.HasSSE41 = isSet(19, ecx1)
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X86.HasSSE42 = isSet(20, ecx1)
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X86.HasPOPCNT = isSet(23, ecx1)
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X86.HasAES = isSet(25, ecx1)
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X86.HasOSXSAVE = isSet(27, ecx1)
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X86.HasRDRAND = isSet(30, ecx1)
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osSupportsAVX := false
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// For XGETBV, OSXSAVE bit is required and sufficient.
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if X86.HasOSXSAVE {
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eax, _ := xgetbv()
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// Check if XMM and YMM registers have OS support.
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osSupportsAVX = isSet(1, eax) && isSet(2, eax)
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}
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X86.HasAVX = isSet(28, ecx1) && osSupportsAVX
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if maxID < 7 {
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return
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}
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_, ebx7, _, _ := cpuid(7, 0)
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X86.HasBMI1 = isSet(3, ebx7)
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X86.HasAVX2 = isSet(5, ebx7) && osSupportsAVX
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X86.HasBMI2 = isSet(8, ebx7)
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X86.HasERMS = isSet(9, ebx7)
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X86.HasRDSEED = isSet(18, ebx7)
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X86.HasADX = isSet(19, ebx7)
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}
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func isSet(bitpos uint, value uint32) bool {
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return value&(1<<bitpos) != 0
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}
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