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| <title>Using as: AArch64 Extensions</title> |
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| Next: <a href="AArch64-Syntax.html#AArch64-Syntax" accesskey="n" rel="next">AArch64 Syntax</a>, Previous: <a href="AArch64-Options.html#AArch64-Options" accesskey="p" rel="prev">AArch64 Options</a>, Up: <a href="AArch64_002dDependent.html#AArch64_002dDependent" accesskey="u" rel="up">AArch64-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p> |
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| <a name="Architecture-Extensions"></a> |
| <h4 class="subsection">9.1.2 Architecture Extensions</h4> |
| |
| <p>The table below lists the permitted architecture extensions that are |
| supported by the assembler and the conditions under which they are |
| automatically enabled. |
| </p> |
| <p>Multiple extensions may be specified, separated by a <code>+</code>. |
| Extension mnemonics may also be removed from those the assembler |
| accepts. This is done by prepending <code>no</code> to the option that adds |
| the extension. Extensions that are removed must be listed after all |
| extensions that have been added. |
| </p> |
| <p>Enabling an extension that requires other extensions will |
| automatically cause those extensions to be enabled. Similarly, |
| disabling an extension that is required by other extensions will |
| automatically cause those extensions to be disabled. |
| </p> |
| <table> |
| <thead><tr><th width="12%">Extension</th><th width="17%">Minimum Architecture</th><th width="17%">Enabled by default</th><th width="54%">Description</th></tr></thead> |
| <tr><td width="12%"><code>crc</code></td><td width="17%">ARMv8-A</td><td width="17%">No</td><td width="54%">Enable CRC instructions.</td></tr> |
| <tr><td width="12%"><code>crypto</code></td><td width="17%">ARMv8-A</td><td width="17%">No</td><td width="54%">Enable cryptographic extensions. This implies <code>fp</code> and <code>simd</code>.</td></tr> |
| <tr><td width="12%"><code>fp</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8-A or later</td><td width="54%">Enable floating-point extensions.</td></tr> |
| <tr><td width="12%"><code>simd</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8-A or later</td><td width="54%">Enable Advanced SIMD extensions. This implies <code>fp</code>.</td></tr> |
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