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doc: document GODEBUG options to disable use of instruction set extensions

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Fixes #27218

Change-Id: I4eb8e8f2486b20fe0ed6e3e2c6ec521c9e8c0032
Reviewed-on: https://go-review.googlesource.com/c/149579
Reviewed-by: Austin Clements <austin@google.com>
This commit is contained in:
Martin Möhrmann 2018-11-14 23:13:28 +01:00
parent c52beb1087
commit 9a258f3086
1 changed files with 12 additions and 0 deletions
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doc/diagnostics.html
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@ -456,3 +456,15 @@ each collection, summarizing the amount of memory collected
and the length of the pause.</li>
<li>GODEBUG=schedtrace=X prints scheduling events every X milliseconds.</li>
</ul>
<p>The GODEBUG environmental variable can be used to disable use of
instruction set extensions in the standard library and runtime.</p>
<ul>
<li>GODEBUG=cpu.all=off disables the use of all optional
instruction set extensions.</li>
<li>GODEBUG=cpu.<em>extension</em>=off disables use of instructions from the
specified instruction set extension.<br>
<em>extension</em> is the lower case name for the instruction set extension
such as <em>sse41</em> or <em>avx</em>.</li>
</ul>