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31 lines
1.2 KiB
ArmAsm
31 lines
1.2 KiB
ArmAsm
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//go:build amd64 && darwin
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// +build amd64,darwin
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#include "textflag.h"
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// Based on https://github.com/golang/sys/blob/ae416a5f93c7892a9dce2d607fc2479eabbacd70/cpu/cpu_x86.s#L31
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// Note that Go currently has problems with AVX512 on darwin due to signal handling conflict in kernel and
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// has been disabled in some libraries for runtime detection. We keep it on as this is unlikely to be used
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// in runtime checks. golang/go#49233
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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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// 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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RET
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