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