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cpu: fix AVX512 support detection on Darwin

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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>
This commit is contained in:
Vaughn Iverson
2021-05-03 07:37:44 +00:00
committed by Martin Möhrmann
parent 71e4cd670f
commit b677753862
4 changed files with 42 additions and 2 deletions
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cpu/cpu_gc_x86.go
+4
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@@ -15,3 +15,7 @@ func cpuid(eaxArg, ecxArg uint32) (eax, ebx, ecx, edx uint32)
// xgetbv with ecx = 0 is implemented in cpu_x86.s for gc compiler
// and in cpu_gccgo.c for gccgo.
func xgetbv() (eax, edx uint32)
// darwinSupportsAVX512 is implemented in cpu_x86.s for gc compiler
// and in cpu_gccgo_x86.go for gccgo.
func darwinSupportsAVX512() bool