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<section id="system-configuration">
<h1>System configuration<a class="headerlink" href="#system-configuration" title="Link to this heading">#</a></h1>
<p>When NumPy is built, information about system configuration is
recorded, and is made available for extension modules using NumPy’s C
API. These are mostly defined in <code class="docutils literal notranslate"><span class="pre">numpyconfig.h</span></code> (included in
<code class="docutils literal notranslate"><span class="pre">ndarrayobject.h</span></code>). The public symbols are prefixed by <code class="docutils literal notranslate"><span class="pre">NPY_*</span></code>.
NumPy also offers some functions for querying information about the
platform in use.</p>
<p>For private use, NumPy also constructs a <code class="docutils literal notranslate"><span class="pre">config.h</span></code> in the NumPy
include directory, which is not exported by NumPy (that is a python
extension which use the numpy C API will not see those symbols), to
avoid namespace pollution.</p>
<section id="data-type-sizes">
<h2>Data type sizes<a class="headerlink" href="#data-type-sizes" title="Link to this heading">#</a></h2>
<p>The <code class="docutils literal notranslate"><span class="pre">NPY_SIZEOF_{CTYPE}</span></code> constants are defined so that sizeof
information is available to the pre-processor.</p>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_SHORT">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_SHORT</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_SHORT" title="Link to this definition">#</a><br /></dt>
<dd><p>sizeof(short)</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_INT">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_INT</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_INT" title="Link to this definition">#</a><br /></dt>
<dd><p>sizeof(int)</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_LONG">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_LONG</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_LONG" title="Link to this definition">#</a><br /></dt>
<dd><p>sizeof(long)</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_LONGLONG">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_LONGLONG</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_LONGLONG" title="Link to this definition">#</a><br /></dt>
<dd><p>sizeof(longlong) where longlong is defined appropriately on the
platform.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_PY_LONG_LONG">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_PY_LONG_LONG</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_PY_LONG_LONG" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_FLOAT">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_FLOAT</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_FLOAT" title="Link to this definition">#</a><br /></dt>
<dd><p>sizeof(float)</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_DOUBLE">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_DOUBLE</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_DOUBLE" title="Link to this definition">#</a><br /></dt>
<dd><p>sizeof(double)</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_LONG_DOUBLE">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_LONG_DOUBLE</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_LONG_DOUBLE" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_LONGDOUBLE">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_LONGDOUBLE</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_LONGDOUBLE" title="Link to this definition">#</a><br /></dt>
<dd><p>sizeof(longdouble)</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_PY_INTPTR_T">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_PY_INTPTR_T</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_PY_INTPTR_T" title="Link to this definition">#</a><br /></dt>
<dd><p>Size of a pointer <code class="docutils literal notranslate"><span class="pre">void</span> <span class="pre">*</span></code> and <code class="docutils literal notranslate"><span class="pre">intptr_t</span></code>/<code class="docutils literal notranslate"><span class="pre">Py_intptr_t</span></code>.</p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_SIZEOF_INTP">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_SIZEOF_INTP</span></span></span><a class="headerlink" href="#c.NPY_SIZEOF_INTP" title="Link to this definition">#</a><br /></dt>
<dd><p>Size of a <code class="docutils literal notranslate"><span class="pre">size_t</span></code> on this platform (<code class="docutils literal notranslate"><span class="pre">sizeof(size_t)</span></code>)</p>
</dd></dl>
</section>
<section id="platform-information">
<h2>Platform information<a class="headerlink" href="#platform-information" title="Link to this heading">#</a></h2>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_X86">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_X86</span></span></span><a class="headerlink" href="#c.NPY_CPU_X86" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_AMD64">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_AMD64</span></span></span><a class="headerlink" href="#c.NPY_CPU_AMD64" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_IA64">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_IA64</span></span></span><a class="headerlink" href="#c.NPY_CPU_IA64" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_PPC">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_PPC</span></span></span><a class="headerlink" href="#c.NPY_CPU_PPC" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_PPC64">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_PPC64</span></span></span><a class="headerlink" href="#c.NPY_CPU_PPC64" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_SPARC">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_SPARC</span></span></span><a class="headerlink" href="#c.NPY_CPU_SPARC" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_SPARC64">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_SPARC64</span></span></span><a class="headerlink" href="#c.NPY_CPU_SPARC64" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_S390">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_S390</span></span></span><a class="headerlink" href="#c.NPY_CPU_S390" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_CPU_PARISC">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_PARISC</span></span></span><a class="headerlink" href="#c.NPY_CPU_PARISC" title="Link to this definition">#</a><br /></dt>
<dd><p>CPU architecture of the platform; only one of the above is
defined.</p>
<p>Defined in <code class="docutils literal notranslate"><span class="pre">numpy/npy_cpu.h</span></code></p>
</dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_LITTLE_ENDIAN">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_LITTLE_ENDIAN</span></span></span><a class="headerlink" href="#c.NPY_LITTLE_ENDIAN" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_BIG_ENDIAN">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_BIG_ENDIAN</span></span></span><a class="headerlink" href="#c.NPY_BIG_ENDIAN" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_BYTE_ORDER">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_BYTE_ORDER</span></span></span><a class="headerlink" href="#c.NPY_BYTE_ORDER" title="Link to this definition">#</a><br /></dt>
<dd><p>Portable alternatives to the <code class="docutils literal notranslate"><span class="pre">endian.h</span></code> macros of GNU Libc.
If big endian, <a class="reference internal" href="#c.NPY_BYTE_ORDER" title="NPY_BYTE_ORDER"><code class="xref c c-data docutils literal notranslate"><span class="pre">NPY_BYTE_ORDER</span></code></a> == <a class="reference internal" href="#c.NPY_BIG_ENDIAN" title="NPY_BIG_ENDIAN"><code class="xref c c-data docutils literal notranslate"><span class="pre">NPY_BIG_ENDIAN</span></code></a>, and
similarly for little endian architectures.</p>
<p>Defined in <code class="docutils literal notranslate"><span class="pre">numpy/npy_endian.h</span></code>.</p>
</dd></dl>
<dl class="c function">
<dt class="sig sig-object c" id="c.PyArray_GetEndianness">
<span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">PyArray_GetEndianness</span></span></span><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#c.PyArray_GetEndianness" title="Link to this definition">#</a><br /></dt>
<dd><p>Returns the endianness of the current platform.
One of <a class="reference internal" href="#c.PyArray_GetEndianness.NPY_CPU_BIG" title="NPY_CPU_BIG"><code class="xref c c-data docutils literal notranslate"><span class="pre">NPY_CPU_BIG</span></code></a>, <a class="reference internal" href="#c.PyArray_GetEndianness.NPY_CPU_LITTLE" title="NPY_CPU_LITTLE"><code class="xref c c-data docutils literal notranslate"><span class="pre">NPY_CPU_LITTLE</span></code></a>,
or <a class="reference internal" href="#c.PyArray_GetEndianness.NPY_CPU_UNKNOWN_ENDIAN" title="NPY_CPU_UNKNOWN_ENDIAN"><code class="xref c c-data docutils literal notranslate"><span class="pre">NPY_CPU_UNKNOWN_ENDIAN</span></code></a>.</p>
<dl class="c macro">
<dt class="sig sig-object c" id="c.PyArray_GetEndianness.NPY_CPU_BIG">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_BIG</span></span></span><a class="headerlink" href="#c.PyArray_GetEndianness.NPY_CPU_BIG" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.PyArray_GetEndianness.NPY_CPU_LITTLE">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_LITTLE</span></span></span><a class="headerlink" href="#c.PyArray_GetEndianness.NPY_CPU_LITTLE" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.PyArray_GetEndianness.NPY_CPU_UNKNOWN_ENDIAN">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_CPU_UNKNOWN_ENDIAN</span></span></span><a class="headerlink" href="#c.PyArray_GetEndianness.NPY_CPU_UNKNOWN_ENDIAN" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
</dd></dl>
</section>
<section id="compiler-directives">
<h2>Compiler directives<a class="headerlink" href="#compiler-directives" title="Link to this heading">#</a></h2>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_LIKELY">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_LIKELY</span></span></span><a class="headerlink" href="#c.NPY_LIKELY" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_UNLIKELY">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_UNLIKELY</span></span></span><a class="headerlink" href="#c.NPY_UNLIKELY" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
<dl class="c macro">
<dt class="sig sig-object c" id="c.NPY_UNUSED">
<span class="sig-name descname"><span class="n"><span class="pre">NPY_UNUSED</span></span></span><a class="headerlink" href="#c.NPY_UNUSED" title="Link to this definition">#</a><br /></dt>
<dd></dd></dl>
</section>
</section>
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