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doc: add Go 1.12 release note for trigonometric reductions in math 

Worth mentioning because the results are not bit-for-bit identical.
This causes a test failure in github.com/fogleman/gg.

Updates #6794

Change-Id: I701f34927731fb5c658a1be271c04388e5e7e3f7
Reviewed-on: https://go-review.googlesource.com/c/157417
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Ian Lance Taylor 2019-01-10 11:12:28 -08:00
parent 4b3f04c63b
commit 5f699e400a
1 changed files with 14 additions and 0 deletions
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doc/go1.12.html
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@ -553,6 +553,20 @@ for {
</dl><!-- lib/time --> </dl><!-- lib/time -->
<dl id="math"><dt><a href="/pkg/math/">math</a></dt>
<dd>
<p><!-- CL 153059 -->
The functions
<a href="/pkg/math/#Sin"><code>Sin</code></a>,
<a href="/pkg/math/#Cos"><code>Cos</code></a>,
<a href="/pkg/math/#Tan"><code>Tan</code></a>,
and <a href="/pkg/math/#Sincos"><code>Sincos</code></a> now
apply Payne-Hanek range reduction to huge arguments. This
produces more accurate answers, but they will not be bit-for-bit
identical with the results in earlier releases.
</p>
</dl><!-- math -->
<dl id="math/bits"><dt><a href="/pkg/math/bits/">math/bits</a></dt> <dl id="math/bits"><dt><a href="/pkg/math/bits/">math/bits</a></dt>
<dd> <dd>
<p><!-- CL 123157 --> <p><!-- CL 123157 -->