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Martin Möhrmann f045ddc624 internal/cpu: add experiment to disable CPU features with GODEBUGCPU
Needs the go compiler to be build with GOEXPERIMENT=debugcpu to be active.

The GODEBUGCPU environment variable can be used to disable usage of
specific processor features in the Go standard library.
This is useful for testing and benchmarking different code paths that
are guarded by internal/cpu variable checks.

Use of processor features can not be enabled through GODEBUGCPU.

To disable usage of AVX and SSE41 cpu features on GOARCH amd64 use:
GODEBUGCPU=avx=0,sse41=0

The special "all" option can be used to disable all options:
GODEBUGCPU=all=0

Updates #12805
Updates #15403

Change-Id: I699c2e6f74d98472b6fb4b1e5ffbf29b15697aab
Reviewed-on: https://go-review.googlesource.com/91737
Run-TryBot: Martin Möhrmann <moehrmann@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
2018-05-22 18:49:31 +00:00
.github github: update Pull Request template 2018-02-21 02:07:46 +00:00
api syscall: introduce Pointer type and use it instead of uintptr 2018-04-18 08:50:42 +00:00
doc doc/contribute.html: remove superfluous article 2018-05-16 12:26:53 +00:00
lib/time all: use HTTPS for iana.org links 2018-02-13 18:36:48 +00:00
misc misc/wasm: make wasm_exec.js more flexible 2018-05-18 18:16:50 +00:00
src internal/cpu: add experiment to disable CPU features with GODEBUGCPU 2018-05-22 18:49:31 +00:00
test test/codegen: improve test cases for arm64 2018-05-22 14:50:41 +00:00
.gitattributes .gitattributes: prevent all magic line ending changes 2014-12-12 23:14:54 +00:00
.gitignore .gitignore: ignore src/cmd/dist/dist 2017-10-28 21:55:49 +00:00
AUTHORS A+C: update email address 2018-04-14 19:28:37 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS C: add Iskander Sharipov's individual CLA mail 2018-04-16 04:49:46 +00:00
favicon.ico website: recreate 16px and 32px favicon 2016-08-25 15:43:32 +00:00
LICENSE doc: revert copyright date to 2009 2016-06-01 22:40:04 +00:00
PATENTS
README.md README: update number of contributors 2018-04-03 22:10:32 +00:00
robots.txt

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