sdk/2.1/docs/man/xhtml/shuffle.html - external/github.com/KhronosGroup/OpenCL-Registry - Git at Google

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     <title>shuffle, shuffle2</title>
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     <meta name="keywords" content="shuffle, shuffle2" />
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   <body>
     <div class="refentry">
       <a id="id-1"></a>
       <div class="titlepage"></div>
       <div xmlns="" class="refnamediv">
         <a xmlns="http://www.w3.org/1999/xhtml" id="shuffle"></a>
         <h1>shuffle</h1>
         <p>
             Constructs a permutation of elements from one (or two) input vectors.
         </p>
       </div>
       <div class="refsynopsisdiv">
         <h2></h2>
         <div class="funcsynopsis">
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               <td>
                 <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                     gentype<em class="replaceable">n</em>
                     <strong class="fsfunc">
                         shuffle
                     </strong>
                 (</code>
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               <td>
                 <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                     gentype<em class="replaceable">n</em>
                     <strong class="fsfunc">
                         shuffle2
                     </strong>
                 (</code>
                 <td>gentype<em xmlns="http://www.w3.org/1999/xhtml" class="replaceable">m</em> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var>, </td>
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               <td> </td>
               <td>ugentype<em xmlns="http://www.w3.org/1999/xhtml" class="replaceable">n</em> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">mask</var><code>)</code></td>
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       <div class="refsect1">
         <a id="description"></a>
         <h2>Description</h2>
         <p>
           The <code class="function">shuffle</code> and <code class="function">shuffle2</code>
           built-in functions construct a permutation of elements from one or two input
           vectors respectively that are of the same type, returning a vector with the
           same element type as the input and length that is the same as the shuffle
           mask. The size of each element in the <code class="varname">mask</code> must match the
           size of each element in the result. For <code class="function">shuffle</code>, only the
           <a class="citerefentry" href="ilogb.html"><span class="citerefentry"><span class="refentrytitle">ilogb</span></span></a>(2<em class="replaceable"><code>m</code></em>-1)
           least significant bits of each <code class="varname">mask</code>
           element are considered. For <code class="function">shuffle2</code>, only the
           <a class="citerefentry" href="ilogb.html"><span class="citerefentry"><span class="refentrytitle">ilogb</span></span></a>(2<em class="replaceable"><code>m</code></em>-1)+1
           least significant bits of each <code class="varname">mask</code> element are considered. Other
           bits in the <code class="varname">mask</code> shall be ignored.
         </p>
         <p>
           The elements of the input vectors are numbered from left to right across one or
           both of the vectors.  For this purpose, the number of elements in a vector is given by
           <a class="citerefentry" href="vec_step.html"><span class="citerefentry"><span class="refentrytitle">vec_step</span></span></a>(gentype<em class="replaceable"><code>m</code></em>).
           The shuffle <code class="varname">mask</code> operand specifies, for each element of the result
           vector, which element of the one or two input vectors the result element gets.
         </p>
         <p>
   General information about miscellaneous vector functions:
   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>,
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   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.
 </p>
         <p>
   The generic type name <span class="type">gentype<em class="replaceable"><code>n</code></em></span>
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   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="refsect2">
         <a id="example1"></a>
         <h3>
             Example
         </h3>
         <div class="informaltable">
           <table class="informaltable" border="0">
             <colgroup>
               <col align="left" class="col1" />
             </colgroup>
             <tbody>
               <tr>
                 <td align="left">
 uint4 mask = (uint4)(3, 2, 1, 0);
 float4 a;
 float4 r = shuffle(a, mask);
 // r.s0123 = a.wzyx

 uint8 mask = (uint8)(0, 1, 2, 3, 4, 5, 6, 7);

 float4 a, b;
 float8 r = shuffle2(a, b, mask);
 // r.s0123 = a.xyzw
 // r.s4567 = b.xyzw

 uint4 mask;
 float8 a;
 float4 b;
 b = shuffle(a, mask);

                         </td>
               </tr>
             </tbody>
           </table>
         </div>
         <p>
           Examples that are not valid are:
         </p>
         <div class="informaltable">
           <table class="informaltable" border="0">
             <colgroup>
               <col align="left" class="col1" />
             </colgroup>
             <tbody>
               <tr>
                 <td align="left">
 uint8 mask;
 short16 a;
 short8 b;
 b = shuffle(a, mask); // invalid

                         </td>
               </tr>
             </tbody>
           </table>
         </div>
       </div>
       <div class="refsect1">
         <a id="specification"></a>
         <h2>Specification</h2>
         <p>
             <img src="pdficon_small1.gif" />

             <a href="https://www.khronos.org/registry/cl/specs/opencl-2.1-openclc.pdf#page=113" 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 © 2007-2015 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
 permit persons to whom the Materials are furnished to do so, subject to
 the condition that this copyright notice and permission notice shall be included
 in all copies or substantial portions of the Materials.
 </div>
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	<title>shuffle, shuffle2</title>
	<meta name="generator" content="DocBook XSL Stylesheets V1.79.1" />
	<meta name="keywords" content="shuffle, shuffle2" />
	</head>
	<body>
	<div class="refentry">
	<a id="id-1"></a>
	<div class="titlepage"></div>
	<div xmlns="" class="refnamediv">
	<a xmlns="http://www.w3.org/1999/xhtml" id="shuffle"></a>
	<h1>shuffle</h1>
	<p>
	Constructs a permutation of elements from one (or two) input vectors.
	</p>
	</div>
	<div class="refsynopsisdiv">
	<h2></h2>
	<div class="funcsynopsis">
	<table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
	<tr valign="bottom">
	<td>
	<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
	gentype<em class="replaceable">n</em>
	<strong class="fsfunc">
	shuffle
	</strong>
	(</code>
	<td>gentype<em xmlns="http://www.w3.org/1999/xhtml" class="replaceable">m</em> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var>, </td>
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	<td> </td>
	<td>ugentype<em xmlns="http://www.w3.org/1999/xhtml" class="replaceable">n</em> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">mask</var><code>)</code></td>
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	<div class="funcsynopsis">
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	<td>
	<code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
	gentype<em class="replaceable">n</em>
	<strong class="fsfunc">
	shuffle2
	</strong>
	(</code>
	<td>gentype<em xmlns="http://www.w3.org/1999/xhtml" class="replaceable">m</em> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">x</var>, </td>
	</td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>gentype<em xmlns="http://www.w3.org/1999/xhtml" class="replaceable">m</em> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">y</var>, </td>
	</tr>
	<tr valign="top">
	<td> </td>
	<td>ugentype<em xmlns="http://www.w3.org/1999/xhtml" class="replaceable">n</em> <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">mask</var><code>)</code></td>
	</tr>
	</table>
	</div>
	</div>
	<div class="refsect1">
	<a id="description"></a>
	<h2>Description</h2>
	<p>
	The <code class="function">shuffle</code> and <code class="function">shuffle2</code>
	built-in functions construct a permutation of elements from one or two input
	vectors respectively that are of the same type, returning a vector with the
	same element type as the input and length that is the same as the shuffle
	mask. The size of each element in the <code class="varname">mask</code> must match the
	size of each element in the result. For <code class="function">shuffle</code>, only the
	<a class="citerefentry" href="ilogb.html"><span class="citerefentry"><span class="refentrytitle">ilogb</span></span></a>(2<em class="replaceable"><code>m</code></em>-1)
	least significant bits of each <code class="varname">mask</code>
	element are considered. For <code class="function">shuffle2</code>, only the
	<a class="citerefentry" href="ilogb.html"><span class="citerefentry"><span class="refentrytitle">ilogb</span></span></a>(2<em class="replaceable"><code>m</code></em>-1)+1
	least significant bits of each <code class="varname">mask</code> element are considered. Other
	bits in the <code class="varname">mask</code> shall be ignored.
	</p>
	<p>
	The elements of the input vectors are numbered from left to right across one or
	both of the vectors. For this purpose, the number of elements in a vector is given by
	<a class="citerefentry" href="vec_step.html"><span class="citerefentry"><span class="refentrytitle">vec_step</span></span></a>(gentype<em class="replaceable"><code>m</code></em>).
	The shuffle <code class="varname">mask</code> operand specifies, for each element of the result
	vector, which element of the one or two input vectors the result element gets.
	</p>
	<p>
	General information about miscellaneous vector functions:
	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>,
	<span class="type">float{2\|4\|8\|16}</span> or <span class="type">double{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.
	</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="refsect2">
	<a id="example1"></a>
	<h3>
	Example
	</h3>
	<div class="informaltable">
	<table class="informaltable" border="0">
	<colgroup>
	<col align="left" class="col1" />
	</colgroup>
	<tbody>
	<tr>
	<td align="left">
	uint4 mask = (uint4)(3, 2, 1, 0);
	float4 a;
	float4 r = shuffle(a, mask);
	// r.s0123 = a.wzyx

	uint8 mask = (uint8)(0, 1, 2, 3, 4, 5, 6, 7);

	float4 a, b;
	float8 r = shuffle2(a, b, mask);
	// r.s0123 = a.xyzw
	// r.s4567 = b.xyzw

	uint4 mask;
	float8 a;
	float4 b;
	b = shuffle(a, mask);

	</td>
	</tr>
	</tbody>
	</table>
	</div>
	<p>
	Examples that are not valid are:
	</p>
	<div class="informaltable">
	<table class="informaltable" border="0">
	<colgroup>
	<col align="left" class="col1" />
	</colgroup>
	<tbody>
	<tr>
	<td align="left">
	uint8 mask;
	short16 a;
	short8 b;
	b = shuffle(a, mask); // invalid

	</td>
	</tr>
	</tbody>
	</table>
	</div>
	</div>
	<div class="refsect1">
	<a id="specification"></a>
	<h2>Specification</h2>
	<p>
	<img src="pdficon_small1.gif" />

	<a href="https://www.khronos.org/registry/cl/specs/opencl-2.1-openclc.pdf#page=113" 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 © 2007-2015 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
	permit persons to whom the Materials are furnished to do so, subject to
	the condition that this copyright notice and permission notice shall be included
	in all copies or substantial portions of the Materials.
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	</div>
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	</html>