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<h1>vec_step</h1>
<p>
Takes a built-in scalar or vector data type argument and returns an integer value representing the
number of elements in the scalar or vector.
</p>
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vec_step
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vec_step
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vec_step
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<strong class="fsfunc">
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<strong class="fsfunc">
vec_step
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<div class="refsect1">
<a id="description"></a>
<h2>Description</h2>
<p>
The <code class="function">vec_step</code> built-in function takes a built-in scalar or vector
data type argument and returns an integer value representing the number of elements
in the scalar or vector.
</p>
<p>
For all scalar types, <code class="function">vec_step</code> returns 1.
</p>
<p>
The <code class="function">vec_step</code> built-in functions that take a 3-component vector return 4.
</p>
<p>
<code class="function">vec_step</code> may also take a pure type as an argument,
e.g. <code class="function">vec_step</code>(<span class="type">float2</span>)
</p>
<p>
We use the generic type name <span class="type">gentype<em class="replaceable"><code>n</code></em></span>
(or <span class="type">gentype<em class="replaceable"><code>m</code></em></span>) to indicate the
built-in data types <span class="type">char{2|4|8|16}</span>, <span class="type">uchar{2|4|8|16}</span>,
<span class="type">short{2|4|8|16}</span>, <span class="type">ushort{2|4|8|16}</span>, <span class="type">int{2|4|8|16}</span>,
<span class="type">uint{2|4|8|16}</span>, <span class="type">long{2|4|8|16}</span>, <span class="type">ulong{2|4|8|16}</span>,
or <span class="type">float{2|4|8|16}</span> as the type for the arguments unless otherwise
stated. We use the generic name <span class="type">ugentype<em class="replaceable"><code>n</code></em></span>
to indicate the built-in unsigned integer data types. If the <span class="type">double</span>
is supported, then <span class="type">gentype<em class="replaceable"><code>n</code></em></span> (or
<span class="type">gentype<em class="replaceable"><code>m</code></em></span>) also indicate the built-in data
types <span class="type">double{2|4|8|16}</span>.
</p>
<p>
The generic type name <span class="type">gentype<em class="replaceable"><code>n</code></em></span>
(or <span class="type">gentype<em class="replaceable"><code>m</code></em></span>)
may indicate the data type <span class="type">half{2|4|8|16}</span> if the
<a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a> extension
is supported.
</p>
</div>
<div class="refsect1">
<a id="specification"></a>
<h2>Specification</h2>
<p>
<img src="pdficon_small1.gif" />
<a href="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=282" target="OpenCL Spec">OpenCL Specification</a>
</p>
</div>
<div class="refsect1">
<a id="seealso"></a>
<h2>Also see</h2>
<p>
<a class="citerefentry" href="miscVectorFunctions.html"><span class="citerefentry"><span class="refentrytitle">Miscellaneous Vector Functions</span></span></a>
</p>
</div>
<div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc.
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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