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b677753862
Summary: On darwin/amd64, it is not adequate to use OSXSAVE bits to determine AVX512 availabilty. The reason is involved. See github issue for details. The fix consists of implementing Apple's recommended approach using the process commpage cpu_capabilities bits to determine availability of AVX512. Fixes golang/go#43089 Change-Id: I1ba89965498863d268fbf2e427dbfd6429c7409f Reviewed-on: https://go-review.googlesource.com/c/sys/+/285572 Trust: Tobias Klauser <tobias.klauser@gmail.com> Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com> TryBot-Result: Go Bot <gobot@golang.org> Reviewed-by: Martin Möhrmann <moehrmann@google.com>
34 lines
840 B
Go
34 lines
840 B
Go
// 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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//go:build (386 || amd64 || amd64p32) && gccgo
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// +build 386 amd64 amd64p32
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// +build gccgo
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package cpu
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//extern gccgoGetCpuidCount
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func gccgoGetCpuidCount(eaxArg, ecxArg uint32, eax, ebx, ecx, edx *uint32)
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func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32) {
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var a, b, c, d uint32
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gccgoGetCpuidCount(eaxArg, ecxArg, &a, &b, &c, &d)
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return a, b, c, d
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}
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//extern gccgoXgetbv
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func gccgoXgetbv(eax, edx *uint32)
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func xgetbv() (eax, edx uint32) {
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var a, d uint32
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gccgoXgetbv(&a, &d)
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return a, d
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}
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// gccgo doesn't build on Darwin, per:
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// https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/gcc.rb#L76
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func darwinSupportsAVX512() bool {
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return false
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}
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