Commit 0d33a896 authored by Brad Fitzpatrick's avatar Brad Fitzpatrick

doc: add FMA mention to Go 1.9 release notes

Fixes #20795
Updates #17895
Updates #20587

Change-Id: Iea375f3a6ffe3f51e3ffdae1fb3fd628b6b3316c
Reviewed-on: https://go-review.googlesource.com/46717Reviewed-by: default avatarIan Lance Taylor <iant@golang.org>
parent bd4fcd00
......@@ -27,8 +27,9 @@ ul li { margin: 0.5em 0; }
after <a href="go1.8">Go 1.8</a> and is the tenth release in
the <a href="https://golang.org/doc/devel/release.html">Go 1.x
series</a>.
There is one <a href="#language">change to the language</a>, adding
support for type aliases.
There are two <a href="#language">changes to the language</a>,
adding support for type aliases, and defining when implementations
may fuse floating point operations.
Most of the changes are in the implementation of the toolchain,
runtime, and libraries.
As always, the release maintains the Go 1
......@@ -49,7 +50,9 @@ ul li { margin: 0.5em 0; }
<h2 id="language">Changes to the language</h2>
<p>
There is one change to the language.
There are two changes to the language.
</p>
<p>
Go now supports type aliases to support gradual code repair while
moving a type between packages.
The <a href="https://golang.org/design/18130-type-alias">type alias
......@@ -69,6 +72,16 @@ type T1 = T2
both <code>T1</code> and <code>T2</code> denote the same type.
</p>
<p> <!-- CL 40391 -->
A smaller language change is that the
<a href="/ref/spec#Floating_point_operators">language specification
now states</a> when implementations are allowed to fuse floating
point operations together, such as by using an architecture's "fused
multiply and add" (FMA) instruction to compute <code>x*y + z</code>
without rounding the intermediate result <code>x*y</code>.
To force the intermediate rounding, write <code>float64(x*y) + z</code>.
</p>
<h2 id="ports">Ports</h2>
<p>
......
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