cpu: add GODEBUG options to disable use of instruction set extensions

mirror of https://github.com/rwinkhart/sys.git synced 2026-08-27 20:36:31 -04:00

The GODEBUG environment variable can be used to disable usage of
specific processor features of Go programs that use the sys/cpu package.
This is useful for testing and benchmarking different code paths that
are guarded by sys/cpu variable checks.

Use of processor features can not be enabled through GODEBUG.

To disable usage of AVX and SSE41 cpu features on GOARCH amd64 use:
GODEBUG=cpu.avx=off,cpu.sse41=off

The special "all" option can be used to disable all options:
GODEBUG=all=off

This aligns the support of GODEBUG for sys/cpu with existing support
for GODEBUG in the Go standard library package internal/cpu.

Fixes golang/go#33963

Change-Id: I618b71af397bf06c57a49b2a300d032a16d05664
Reviewed-on: https://go-review.googlesource.com/c/sys/+/245237
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Martin Möhrmann <moehrmann@google.com>
Reviewed-by: Tobias Klauser <tobias.klauser@gmail.com>

This commit is contained in:

Polina Osadcha

2020-08-05 06:55:43 +00:00

committed by

Martin Möhrmann

parent 64077c9b56

commit 0cf7623e9d

15 changed files with 260 additions and 10 deletions

									
										cpu/cpu_linux.go
									
		+1
		-1
	
												View File
												
				@@ -6,7 +6,7 @@

				package cpu

				func init() {

				func archInit() {

					if err := readHWCAP(); err != nil {

						return

					}