2021-03-01 04:38:33 +05:30
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// Copyright (c) 2015 Klaus Post, released under MIT License. See LICENSE file.
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//+build amd64,!gccgo,!noasm,!appengine
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// func asmCpuid(op uint32) (eax, ebx, ecx, edx uint32)
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TEXT ·asmCpuid(SB), 7, $0
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XORQ CX, CX
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MOVL op+0(FP), AX
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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 asmCpuidex(op, op2 uint32) (eax, ebx, ecx, edx uint32)
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TEXT ·asmCpuidex(SB), 7, $0
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MOVL op+0(FP), AX
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MOVL op2+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 asmXgetbv(index uint32) (eax, edx uint32)
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TEXT ·asmXgetbv(SB), 7, $0
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MOVL index+0(FP), CX
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BYTE $0x0f; BYTE $0x01; BYTE $0xd0 // XGETBV
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MOVL AX, eax+8(FP)
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MOVL DX, edx+12(FP)
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RET
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// func asmRdtscpAsm() (eax, ebx, ecx, edx uint32)
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TEXT ·asmRdtscpAsm(SB), 7, $0
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BYTE $0x0F; BYTE $0x01; BYTE $0xF9 // RDTSCP
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MOVL AX, eax+0(FP)
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MOVL BX, ebx+4(FP)
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MOVL CX, ecx+8(FP)
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MOVL DX, edx+12(FP)
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RET
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2021-06-10 20:14:25 +05:30
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// From https://go-review.googlesource.com/c/sys/+/285572/
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// func asmDarwinHasAVX512() bool
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TEXT ·asmDarwinHasAVX512(SB), 7, $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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MOVW (BX), AX
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CMPW AX, $13 // versions < 13 do not support AVX512
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JL no_avx512
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MOVQ $commpage64_cpu_capabilities64, BX
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MOVQ (BX), AX
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MOVQ $hasAVX512F, CX
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ANDQ CX, AX
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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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