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doc: improve documentation for GOAMD64

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The change clarifies in the release notes for go1.18 that the variable
is for compilation and references the microarchitecture description in
the Go Wiki,
https://golang.org/wiki/MinimumRequirements#amd64,
and references the same information in the output of go help
environment.

Fixes #50174

Change-Id: I6a7d5a06f48463a810c96cc9c76fe66113d5147c
Reviewed-on: https://go-review.googlesource.com/c/go/+/372194
Reviewed-by: Keith Randall <khr@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Ulrich Kunitz 2021-12-15 11:37:36 +01:00 committed by Keith Randall
parent 2b39d86344
commit b5bfaf410a
3 changed files with 7 additions and 6 deletions
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9
doc/go1.18.html
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@ -143,11 +143,12 @@ Do not send CLs removing the interior tags from such phrases.
<h3 id="amd64">AMD64</h3>
<p><!-- CL 349595 -->
Go 1.18 introduces the new <code>GOAMD64</code> environment variable which selects
a version of the AMD64 architecture. Allowed values are <code>v1</code>,
Go 1.18 introduces the new <code>GOAMD64</code> environment variable, which selects
a mininum target version of the AMD64 architecture. Allowed values are <code>v1</code>,
<code>v2</code>, <code>v3</code>, or <code>v4</code>. Each higher level requires,
and takes advantage of, additional processor features. A detailed description of the
versions is <a href="https://en.wikipedia.org/wiki/X86-64#Microarchitecture_levels">here</a>.
and takes advantage of, additional processor features. A detailed
description can be found
<a href="https://golang.org/wiki/MinimumRequirements#amd64">here</a>.
</p>
<p>
The <code>GOAMD64</code> environment variable defaults to <code>v1</code>.

2
src/cmd/go/alldocs.go
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@ -2131,7 +2131,7 @@
// GOAMD64
// For GOARCH=amd64, the microarchitecture level for which to compile.
// Valid values are v1 (default), v2, v3, v4.
// See https://en.wikipedia.org/wiki/X86-64#Microarchitecture_levels.
// See https://golang.org/wiki/MinimumRequirements#amd64
// GOMIPS
// For GOARCH=mips{,le}, whether to use floating point instructions.
// Valid values are hardfloat (default), softfloat.

2
src/cmd/go/internal/help/helpdoc.go
View file

@ -595,7 +595,7 @@ Architecture-specific environment variables:
GOAMD64
For GOARCH=amd64, the microarchitecture level for which to compile.
Valid values are v1 (default), v2, v3, v4.
See https://en.wikipedia.org/wiki/X86-64#Microarchitecture_levels.
See https://golang.org/wiki/MinimumRequirements#amd64
GOMIPS
For GOARCH=mips{,le}, whether to use floating point instructions.
Valid values are hardfloat (default), softfloat.