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<a name="ARM-C-Language-Extensions-_0028ACLE_0029"></a>
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Next: <a href="ARM-Floating-Point-Status-and-Control-Intrinsics.html#ARM-Floating-Point-Status-and-Control-Intrinsics" accesskey="n" rel="next">ARM Floating Point Status and Control Intrinsics</a>, Previous: <a href="ARM-iWMMXt-Built_002din-Functions.html#ARM-iWMMXt-Built_002din-Functions" accesskey="p" rel="prev">ARM iWMMXt Built-in Functions</a>, Up: <a href="Target-Builtins.html#Target-Builtins" accesskey="u" rel="up">Target Builtins</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<a name="ARM-C-Language-Extensions-_0028ACLE_0029-1"></a>
<h4 class="subsection">6.60.7 ARM C Language Extensions (ACLE)</h4>

<p>GCC implements extensions for C as described in the ARM C Language
Extensions (ACLE) specification, which can be found at
<a href="https://developer.arm.com/documentation/ihi0053/latest/">https://developer.arm.com/documentation/ihi0053/latest/</a>.
</p>
<p>As a part of ACLE, GCC implements extensions for Advanced SIMD as described in
the ARM C Language Extensions Specification.  The complete list of Advanced SIMD
intrinsics can be found at
<a href="https://developer.arm.com/documentation/ihi0073/latest/">https://developer.arm.com/documentation/ihi0073/latest/</a>.
The built-in intrinsics for the Advanced SIMD extension are available when
NEON is enabled.
</p>
<p>Currently, ARM and AArch64 back ends do not support ACLE 2.0 fully.  Both
back ends support CRC32 intrinsics and the ARM back end supports the
Coprocessor intrinsics, all from <samp>arm_acle.h</samp>.  The ARM back end&rsquo;s 16-bit
floating-point Advanced SIMD intrinsics currently comply to ACLE v1.1.
AArch64&rsquo;s back end does not have support for 16-bit floating point Advanced SIMD
intrinsics yet.
</p>
<p>See <a href="ARM-Options.html#ARM-Options">ARM Options</a> and <a href="AArch64-Options.html#AArch64-Options">AArch64 Options</a> for more information on the
availability of extensions.
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