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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8" />
<title>flatorize_d: Generate fast D code</title>
<link rel="stylesheet" type="text/css" href="prettify/prettify.css">
<link rel="stylesheet" type="text/css" href="style.css">
<script type="text/javascript" src="log.js"></script>
<script type="text/javascript" src="flatorize.js"></script>
<script type="text/javascript" src="examples.js"></script>
<script type="text/javascript">generate_small_functions();</script>
<script type="text/javascript" src="flatorize_type_util.js"></script>
<script type="text/javascript" src="flatorize_d.js"></script>
<script type="text/javascript" src="modifsplitradix.js"></script>
<!--script type="text/javascript" src="examples_c.js"></script-->
</head>
<body>
<a href="https:/glathoud/flatorize" class="print-hidden">
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<h2><code>flatorize_d</code>: Generate fast D code</h2>
<p style="text-align:right">by <a href="http://glat.info">Guillaume Lathoud</a><span class="print"> [1]</span>, September 2015</p>
<div class="fixed-br print-hidden"><a href="#top">Back to the top</a></div>
<p>This page presents a plugin method <code>flatorize.getCodeD()</code> (GitHub <a href="https:/glathoud/flatorize/blob/master/flatorize_d.js">source</a>) that goes on top of <code>flatorize</code> (see the <a href="index.html">main article</a>, GitHub <a href="https:/glathoud/flatorize/blob/master/flatorize.js">source</a>).</p>
<p>See also:</p>
<ul>
<li><a href="index.html">Main article</a>.</li>
<li><a href="asmjs.html"><code>asm.js</code> plugin</a>.</li>
<li><a href="c.html">C plugin</a>.</li>
<li>Unit tests for <code>asm.js</code>, C and D (source on <a href="https:/glathoud/flatorize/tree/master/test">GitHub</a>).</li>
<li><a href="test/speed_test_c_fftw/dftreal.html">Speed tests</a> of the various languages & platforms (JS, <code>asm.js</code>, C, D…; <a href="https:/glathoud/flatorize/tree/master/test/speed_test_c_fftw/">GitHub</a>).</li>
</ul>
<h3 class="anchorable" id="contents">Contents <a href="#contents" class="anchor">#</a></h3>
<ul class="contents-ul"></ul>
<h3 class="anchorable" id="c-f2">HOWTO: 2-step example <a href="#c-f2" class="anchor">#</a></h3>
<p>Here is an expression definition that uses complex numbers (details in the <a href="index.html#example">main article</a>):</p>
<pre class="prettyprint lang-js"><code>// f:
<script type="text/javascript">document.write(f2.exprgen+"");</script></code></pre>
<p>A call to <code>flatorize()</code>:</p>
<pre class="prettyprint lang-js"><code>// note the type declarations, ignored by JavaScript but used later for C
f2 = flatorize('a:[2 float],b:[2 float],c:[2 float]->d:[2 float]',f);
</code></pre>
<p>...generates flatorized JavaScript code:</p>
<pre class="prettyprint lang-js"><code>// f2.getDirect():
<script type="text/javascript">document.write(f2.getDirect()+"");</script></code></pre>
<p>Then, a call to <code>flatorize.getCodeD()</code>:</p>
<script type="text/javascript" id="script-gen-f2_c_code">var f2_obj = flatorize.getCodeD( { switcher: f2, name: "f2" } );</script>
<pre class="prettyprint lang-js"><code><script type="text/javascript">document.write(document.getElementById("script-gen-f2_c_code").textContent);</script></code></pre>
<p>...generates <code>f2_obj.code</code>, a JavaScript string containing the D code below:</p>
<pre class="prettyprint lang-c"><code><script type="text/javascript">document.write(f2_obj.code);</script></code></pre>
<p class="small">(This code, as a few others below, was produced and inserted as you loaded the page.)</p>
<p>Having the intermediate <code>flatorize</code>d implementation <code>f2</code> can be useful to build other <code>flatorize</code>d implementations, i.e. to write well-encapsulated, maintainable code using many small functions.</p>
<h3 class="anchorable" id="f2-shortcut">HOWTO: 1-step shortcut <a href="#f2-shortcut" class="anchor">#</a></h3>
<p>If an intermediate <code>flatorize</code>d implementation is not needed, one can directly create D code in a single step:</p>
<script type="text/javascript" id="script-gen-f2_c_direct">var f2_obj_direct = flatorize.getCodeD( {
name : 'f2'
, varstr : 'a:[2 float],b:[2 float],c:[2 float]->d:[2 float]'
, exprgen : f2.exprgen
} );</script>
<pre class="prettyprint lang-js"><code><script type="text/javascript">document.write(document.getElementById("script-gen-f2_c_direct").textContent.replace("f2.exprgen",""+f2.exprgen));</script></code></pre>
<h3 class="anchorable" id="helper-code">HOWTO: generate boilerplate code<a href="#helper-code" class="anchor">#</a></h3>
<p>JavaScript helper methods <code>f2_obj.helper_*()</code> generate boilerplate D code, especially useful to manage array inputs/output:</p>
<p><code>f2_obj.helper_decl()</code> returns a JavaScript string containing this D code:</p>
<pre class="prettyprint lang-c"><code><script type="text/javascript">document.write(f2_obj.helper_decl());</script></code></pre>
<p><code>f2_obj.helper_d()</code> returns a JavaScript string containing the D code below. Instead of the default file name <code>"helper.h"</code> you can optionally specify another file name using <code>f2_obj.helper_d({ helper_decl_name : "another_name_decl.d" })</code></p>
<pre class="prettyprint lang-c"><code id="helper_d"></code></pre>
<script type="text/javascript">document.getElementById("helper_d").textContent = f2_obj.helper_d();</script>
<script type="text/javascript" src="contents_ul.js"></script>
<script type="text/javascript" src="prettify/prettify.js"></script>
<script type="text/javascript">setTimeout( prettyPrint );</script>
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</body>
</html>