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    <title>Preprocessor Directives and Macros</title>
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    <div class="refentry">
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        <a xmlns="http://www.w3.org/1999/xhtml" id="Preprocessor Directives and Macros"></a>
        <h1>Preprocessor Directives and Macros</h1>
        <p>
            Preprocessor Directives and Macros.
        </p>
      </div>
      <div class="refsect2">
        <a id="synopsis"></a>
        <h3>
        </h3>
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# <code class="function">pragma</code> <code class="varname">pp-tokens</code><sub>opt</sub> <span class="emphasis"><em>new-line</em></span>
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      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
The preprocessing directives defined by the C99 specification are supported.
        </p>
        <p>
A <code class="function"># pragma</code> directive where the preprocessing token <code class="constant">OPENCL</code> (used instead of <code class="constant">STDC</code>) does not immediately follow <code class="function">pragma</code> in the directive (prior to any macro replacement) causes the implementation to behave in an implementation-defined manner. The behavior might cause translation to fail or cause the translator or the resulting program to behave in a non-conforming manner. Any such <code class="function">pragma</code> that is not recognized by the implementation is ignored. If the preprocessing token <code class="constant">OPENCL</code> does immediately follow <code class="function">pragma</code> in the directive (prior to any macro replacement), then no macro replacement is performed on the directive, and the directive shall have one of the following forms whose meanings are described elsewhere:
</p>
        <p>
</p>
        <div class="literallayout">
          <p>
            <code class="constant">          #pragma OPENCL <a class="citerefentry" href="FP_CONTRACT.html"><span class="citerefentry"><span class="refentrytitle">FP_CONTRACT</span></span></a> <em class="replaceable"><code>on-off-switch</code></em><br />
               <em class="replaceable"><code>on-off-switch</code></em>: one of ON OFF DEFAULT<br />
          #pragma OPENCL <a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</span></span></a> extensionname : behavior<br />
          #pragma OPENCL EXTENSION all : behavior</code>
          </p>
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        <p>
        </p>
        <p>
The following predefined macro names are available.
        </p>
        <div class="itemizedlist">
          <ul class="itemizedlist" style="list-style-type: disc; ">
            <li class="listitem" style="list-style-type: disc"><code class="constant">__FILE__</code> The presumed name of the current source file (a character string literal).
            </li>
            <li class="listitem" style="list-style-type: disc"><code class="code">__LINE__</code> The presumed line number (within the current source file) of the current source line (an integer constant).
            </li>
            <li class="listitem" style="list-style-type: disc"><code class="code">__OPENCL_VERSION__</code> substitutes an integer reflecting the version number of the OpenCL supported by the OpenCL device. The version of OpenCL described in this document will have <code class="code">__OPENCL_VERSION__</code> substitute the integer 100.
            </li>
            <li class="listitem" style="list-style-type: disc"><code class="code">__ENDIAN_LITTLE__</code> is used to determine if the OpenCL device is a little endian architecture or a big endian architecture (an integer constant of 1 if device is little endian and is undefined otherwise). Also refer to CL_DEVICE_ENDIAN_LITTLE specified in the table of OpenCL Device Queries for <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>.
            </li>
            <li class="listitem" style="list-style-type: disc"><code class="code">__ROUNDING_MODE__</code> is used to determine the current rounding mode and is set to rte. The  <code class="code">__ROUNDING_MODE__</code> only affects the rounding mode of conversions to a <span class="type">float</span> type.
<code class="code">__kernel_exec(X, type<em class="replaceable"><code>n</code></em>)</code> (and <code class="code">kernel_exec(X, type<em class="replaceable"><code>n</code></em>))</code> is defined as follows:
		<p>
</p><div class="literallayout"><p>     <code class="code">__kernel __attribute__((work_group_size_hint(X, 1, 1)))</code> \<br />
              <code class="code">__attribute__((vec_type_hint(type<em class="replaceable"><code>n</code></em>)))</code></p></div><p>
		</p></li>
            <li class="listitem" style="list-style-type: disc"><code class="code">__IMAGE_SUPPORT__</code> is used to determine if the OpenCL device supports images. This is an integer constant of 1 if images are supported and is undefined otherwise. Also refer to CL_DEVICE_IMAGE_SUPPORT specified in the table of OpenCL Device Queries for <a class="citerefentry" href="clGetDeviceInfo.html"><span class="citerefentry"><span class="refentrytitle">clGetDeviceInfo</span></span></a>.
            </li>
            <li class="listitem" style="list-style-type: disc"><code class="code">__FAST_RELAXED_MATH__</code> is used to determine if the cl-fast-relaxed-math optimization option is specified in build options given to  <a class="citerefentry" href="clBuildProgram.html"><span class="citerefentry"><span class="refentrytitle">clBuildProgram</span></span></a>.
This is an integer constant of 1 if the cl-fast-relaxed-math build option is specified and is undefined otherwise. The macro names defined by the C99 specification but not currently supported by OpenCL are
reserved for future use.
            </li>
          </ul>
        </div>
      </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-1.0.pdf#page=160" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="clBuildProgram.html"><span class="citerefentry"><span class="refentrytitle">clBuildProgram</span></span></a>, 
			<a class="citerefentry" href="FP_CONTRACT.html"><span class="citerefentry"><span class="refentrytitle">FP_CONTRACT</span></span></a>, 
			<a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</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 © 2007-2009 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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