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| <title>Preprocessor Directives and Macros</title> |
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| <meta name="keywords" content="Preprocessor Directives and Macros" /> |
| </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="PreprocessorDirectivesandMacros"></a> |
| <h1>Preprocessor Directives and Macros</h1> |
| <p> |
| Preprocessor Directives and Macros. |
| </p> |
| </div> |
| <div class="refsect2"> |
| <a id="synopsis"></a> |
| <h3> |
| </h3> |
| <div class="informaltable"> |
| <table class="informaltable" border="0"> |
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| <td align="left"> |
| # <code class="function">pragma</code> <code class="varname">pp-tokens</code><sub>opt</sub> <span class="emphasis"><em>new-line</em></span> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| </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> <code class="varname">extensionname : behavior</code><br /> |
| #pragma OPENCL <a class="citerefentry" href="EXTENSION.html"><span class="citerefentry"><span class="refentrytitle">EXTENSION</span></span></a> all : <code class="varname">behavior</code></code> |
| </p> |
| </div> |
| <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="code">__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 200. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><code class="code">CL_VERSION_1_0</code> substitutes the integer 100 reflecting the OpenCL 1.0 version. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><code class="code">CL_VERSION_1_1</code> substitutes the integer 110 reflecting the OpenCL 1.1 version. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><code class="code">CL_VERSION_1_2</code> substitutes the integer 120 reflecting the OpenCL 1.2 version. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><code class="code">CL_VERSION_2_0</code> substitutes the integer 200 reflecting the OpenCL 2.0 version. |
| </li> |
| <li class="listitem" style="list-style-type: disc"><code class="code">__OPENCL_C_VERSION__</code> substitutes an integer reflecting |
| the OpenCL C version specified by the <code class="code">-cl-std</code> build option to |
| <a class="citerefentry" href="clBuildProgram.html"><span class="citerefentry"><span class="refentrytitle">clBuildProgram</span></span></a> or |
| <a class="citerefentry" href="clCompileProgram.html"><span class="citerefentry"><span class="refentrytitle">clCompileProgram</span></span></a>. |
| If the <code class="code">-cl-std</code> |
| build option is not specified, the highest OpenCL C 1.x |
| language version supported by each device is used |
| as the version of OpenCL C when compiling |
| the program for each device. The version of OpenCL C |
| described in this document will have |
| <code class="code">__OPENCL_C_VERSION__</code> substitute the integer 200 |
| if <code class="code">–cl-std=CL2.0</code> is specified. |
| </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 |
| <code class="constant">CL_DEVICE_ENDIAN_LITTLE</code> 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">__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 <code class="constant">CL_DEVICE_IMAGE_SUPPORT</code> |
| 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> or |
| <a class="citerefentry" href="clCompileProgram.html"><span class="citerefentry"><span class="refentrytitle">clCompileProgram</span></span></a>. |
| This is an integer constant of 1 if the cl-fast-relaxed-math build option |
| is specified and is undefined otherwise. |
| </li> |
| <li class="listitem" style="list-style-type: disc"> |
| The <code class="code">NULL</code> macro expands to a null pointer |
| constant. An integer constant expression with the |
| value 0, or such an expression cast to type |
| <code class="code">void *</code> is called a null pointer constant. |
| </li> |
| <li class="listitem" style="list-style-type: disc"> |
| The macro names defined by the C99 specification but not currently supported |
| by OpenCL are reserved for future use. |
| </li> |
| <li class="listitem" style="list-style-type: disc"> |
| The predefined identifier <code class="code">__func__</code> is available. |
| </li> |
| </ul> |
| </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-2.0-openclc.pdf#namedest=preprocessorDirectives" target="OpenCL Spec">OpenCL Specification</a> |
| </p> |
| </div> |
| <div class="refsect1"> |
| <a id="seealso"></a> |
| <h2>Also see</h2> |
| <p> |
| <a class="citerefentry" href="mathConstants.html"><span class="citerefentry"><span class="refentrytitle">Symbolic Math Constants</span></span></a>, |
| <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 © 2007-2015 The Khronos Group Inc. |
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| "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 |
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