109 lines
6.1 KiB
HTML
109 lines
6.1 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using as: AArch64 Extensions</title>
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<meta name="description" content="Using as: AArch64 Extensions">
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<meta name="keywords" content="Using as: AArch64 Extensions">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="AArch64_002dDependent.html#AArch64_002dDependent" rel="up" title="AArch64-Dependent">
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<link href="AArch64-Syntax.html#AArch64-Syntax" rel="next" title="AArch64 Syntax">
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<link href="AArch64-Options.html#AArch64-Options" rel="prev" title="AArch64 Options">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="AArch64-Extensions"></a>
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<div class="header">
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<p>
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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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</div>
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<hr>
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<a name="Architecture-Extensions"></a>
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<h4 class="subsection">9.1.2 Architecture Extensions</h4>
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<p>The table below lists the permitted architecture extensions that are
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supported by the assembler and the conditions under which they are
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automatically enabled.
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</p>
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<p>Multiple extensions may be specified, separated by a <code>+</code>.
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Extension mnemonics may also be removed from those the assembler
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accepts. This is done by prepending <code>no</code> to the option that adds
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the extension. Extensions that are removed must be listed after all
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extensions that have been added.
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</p>
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<p>Enabling an extension that requires other extensions will
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automatically cause those extensions to be enabled. Similarly,
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disabling an extension that is required by other extensions will
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automatically cause those extensions to be disabled.
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</p>
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<table>
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<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>
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<tr><td width="12%"><code>crc</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable CRC instructions.</td></tr>
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<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>
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<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>
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<tr><td width="12%"><code>fp16</code></td><td width="17%">ARMv8.2-A</td><td width="17%">ARMv8.2-A or later</td><td width="54%">Enable ARMv8.2 16-bit floating-point support. This implies
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<code>fp</code>.</td></tr>
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<tr><td width="12%"><code>lor</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable Limited Ordering Regions extensions.</td></tr>
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<tr><td width="12%"><code>lse</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable Large System extensions.</td></tr>
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<tr><td width="12%"><code>pan</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable Privileged Access Never support.</td></tr>
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<tr><td width="12%"><code>profile</code></td><td width="17%">ARMv8.2-A</td><td width="17%">No</td><td width="54%">Enable statistical profiling extensions.</td></tr>
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<tr><td width="12%"><code>ras</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.2-A or later</td><td width="54%">Enable the Reliability, Availability and Serviceability
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extension.</td></tr>
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<tr><td width="12%"><code>rdma</code></td><td width="17%">ARMv8-A</td><td width="17%">ARMv8.1-A or later</td><td width="54%">Enable ARMv8.1 Advanced SIMD extensions. This implies <code>simd</code>.</td></tr>
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<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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</table>
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</body>
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</html>
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