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<?xml-stylesheet type="text/xsl" href="https://community.arm.com/utility/feedstylesheets/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/" xmlns:wfw="http://wellformedweb.org/CommentAPI/"><channel><title>NEON matrix multiply</title><link>https://community.arm.com/developer/tools-software/tools/f/armds-forum/951/neon-matrix-multiply</link><description> Note: This was originally posted on 24th November 2011 at http://forums.arm.com I&amp;#39;m new to neon and I&amp;#39;m trying to do some multiplication. I need to do some multiplication of two arrays and I&amp;#39;m trying to learn some NEON assembly. I have 2 arrays of int16_t</description><dc:language>en-US</dc:language><generator>Telligent Community 10</generator><item><title>RE: NEON matrix multiply</title><link>https://community.arm.com/thread/2801?ContentTypeID=1</link><pubDate>Wed, 11 Sep 2013 11:05:19 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:a1514adb-ae82-4fd7-a70e-67048afa7a13</guid><dc:creator>Shervin Emami</dc:creator><description>&lt;div&gt;&lt;i&gt;Note: This was originally posted on 10th December 2011 at &lt;a href="http://forums.arm.com"&gt;http://forums.arm.com&lt;/a&gt;&lt;/i&gt;&lt;br /&gt;&lt;br /&gt;&lt;blockquote&gt;&lt;br /&gt;Basically, at the place of my TODO I want to shift elements of array &lt;strong&gt;b&lt;/strong&gt; so that&lt;strong&gt; b&lt;/strong&gt; becomes:&amp;#160; &lt;code&gt;{b[0], b[1], b[2], b[3]} -&amp;gt; {0, b[0], b[1], b[2]}&lt;/code&gt;&lt;br /&gt;&lt;/blockquote&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;Maybe you can use the &amp;quot;vsli&amp;quot; instruction to shift the bits across and insert 0 into it. Or perhaps just &amp;quot;vshr&amp;quot; to shift-right?&lt;/span&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;-Shervin.&lt;/span&gt;&lt;/div&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item><item><title>RE: NEON matrix multiply</title><link>https://community.arm.com/thread/2799?ContentTypeID=1</link><pubDate>Wed, 11 Sep 2013 11:05:19 GMT</pubDate><guid isPermaLink="false">dd9e70c8-6d3c-4c71-b136-2456382a7b5c:4eaa4fdc-cd98-4987-87a6-3a6e97164817</guid><dc:creator>Etienne SOBOLE</dc:creator><description>&lt;div&gt;&lt;i&gt;Note: This was originally posted on 10th December 2011 at &lt;a href="http://forums.arm.com"&gt;http://forums.arm.com&lt;/a&gt;&lt;/i&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;Do you want to optimize one computation&lt;/span&gt;&lt;br /&gt;&lt;br /&gt;&lt;span&gt;Or do you have an lot of couple of vector to multiply ?&lt;/span&gt;&lt;br /&gt;&lt;span&gt;In the second case, you will be able to prepare the next data during the previous calculation.&lt;/span&gt;&lt;/div&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;</description></item></channel></rss>