Extracts changes from that were submitted in other CLs to enable AVX512
detection, notably:
- https://go-review.googlesource.com/c/go/+/271521
- https://go-review.googlesource.com/c/go/+/379394
- https://go-review.googlesource.com/c/go/+/502476
This change adds properties to the cpu.X86 fields to enable runtime
detection of AVX512, and the hasAVX512F, hasAVX512BW, and hasAVX512VL
macros to support bypassing runtime checks in assembly code when
GOAMD64=v4 is set.
Change-Id: Ia7c3f22f1e66bf1de575aba522cb0d0a55ce791f
Reviewed-on: https://go-review.googlesource.com/c/go/+/536257 Reviewed-by: Keith Randall <khr@golang.org> Reviewed-by: Martin Möhrmann <martin@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Martin Möhrmann <martin@golang.org> Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
Commit-Queue: Martin Möhrmann <martin@golang.org> Reviewed-by: Martin Möhrmann <moehrmann@google.com>