2019-05-30 03:20:56 -07:00
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// 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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2021-06-16 12:00:49 -07:00
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//go:build (386 || amd64 || amd64p32) && gc
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2019-05-30 03:20:56 -07:00
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// +build 386 amd64 amd64p32
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2020-12-31 05:48:12 -08:00
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// +build gc
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2019-05-30 03:20:56 -07:00
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#include "textflag.h"
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// func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
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TEXT ·cpuid(SB), NOSPLIT, $0-24
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MOVL eaxArg+0(FP), AX
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MOVL ecxArg+4(FP), CX
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CPUID
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MOVL AX, eax+8(FP)
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MOVL BX, ebx+12(FP)
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MOVL CX, ecx+16(FP)
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MOVL DX, edx+20(FP)
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RET
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// func xgetbv() (eax, edx uint32)
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TEXT ·xgetbv(SB),NOSPLIT,$0-8
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MOVL $0, CX
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XGETBV
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MOVL AX, eax+0(FP)
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MOVL DX, edx+4(FP)
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RET
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2021-06-16 12:00:49 -07:00
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// func darwinSupportsAVX512() bool
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TEXT ·darwinSupportsAVX512(SB), NOSPLIT, $0-1
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MOVB $0, ret+0(FP) // default to false
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#ifdef GOOS_darwin // return if not darwin
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#ifdef GOARCH_amd64 // return if not amd64
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// These values from:
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// https://github.com/apple/darwin-xnu/blob/xnu-4570.1.46/osfmk/i386/cpu_capabilities.h
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#define commpage64_base_address 0x00007fffffe00000
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#define commpage64_cpu_capabilities64 (commpage64_base_address+0x010)
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#define commpage64_version (commpage64_base_address+0x01E)
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#define hasAVX512F 0x0000004000000000
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MOVQ $commpage64_version, BX
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CMPW (BX), $13 // cpu_capabilities64 undefined in versions < 13
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JL no_avx512
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MOVQ $commpage64_cpu_capabilities64, BX
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MOVQ $hasAVX512F, CX
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TESTQ (BX), CX
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JZ no_avx512
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MOVB $1, ret+0(FP)
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no_avx512:
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#endif
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#endif
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RET
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