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90 lines
5.3 KiB
HTML
90 lines
5.3 KiB
HTML
4 years ago
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<title>AArch64 Extensions - Using as</title>
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<meta name="description" content="Using as">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="AArch64_002dDependent.html#AArch64_002dDependent" title="AArch64-Dependent">
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<link rel="prev" href="AArch64-Options.html#AArch64-Options" title="AArch64 Options">
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<link rel="next" href="AArch64-Syntax.html#AArch64-Syntax" title="AArch64 Syntax">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991-2015 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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</head>
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<body>
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<div class="node">
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<a name="AArch64-Extensions"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="AArch64-Syntax.html#AArch64-Syntax">AArch64 Syntax</a>,
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Previous: <a rel="previous" accesskey="p" href="AArch64-Options.html#AArch64-Options">AArch64 Options</a>,
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Up: <a rel="up" accesskey="u" href="AArch64_002dDependent.html#AArch64_002dDependent">AArch64-Dependent</a>
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<hr>
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</div>
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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>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>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><table summary=""><tr align="left"><th valign="top" width="12%">Extension </th><th valign="top" width="17%">Minimum Architecture </th><th valign="top" width="17%">Enabled by default
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</th><th valign="top" width="54%">Description
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<br></th></tr><tr align="left"><td valign="top" width="12%"><code>crc</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8.1-A or later
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</td><td valign="top" width="54%">Enable CRC instructions.
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<br></td></tr><tr align="left"><td valign="top" width="12%"><code>crypto</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">No
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</td><td valign="top" width="54%">Enable cryptographic extensions. This implies <code>fp</code> and <code>simd</code>.
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<br></td></tr><tr align="left"><td valign="top" width="12%"><code>fp</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8-A or later
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</td><td valign="top" width="54%">Enable floating-point extensions.
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<br></td></tr><tr align="left"><td valign="top" width="12%"><code>simd</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8-A or later
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</td><td valign="top" width="54%">Enable Advanced SIMD extensions. This implies <code>fp</code>.
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<br></td></tr><tr align="left"><td valign="top" width="12%"><code>pan</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8-A or later
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</td><td valign="top" width="54%">Enable Privileged Access Never support.
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<br></td></tr><tr align="left"><td valign="top" width="12%"><code>lor</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8-A or later
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</td><td valign="top" width="54%">Enable Limited Ordering Regions extensions.
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<br></td></tr><tr align="left"><td valign="top" width="12%"><code>rdma</code> </td><td valign="top" width="17%">ARMv8-A </td><td valign="top" width="17%">ARMv8-A or later
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</td><td valign="top" width="54%">Enable ARMv8.1 Advanced SIMD extensions. This implies <code>simd</code>.
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<br></td></tr><tr align="left"><td valign="top" width="12%"><code>fp16</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">ARMv8.2-A or later
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</td><td valign="top" width="54%">Enable ARMv8.2 16-bit floating-point support. This implies
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<code>fp</code>.
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<br></td></tr><tr align="left"><td valign="top" width="12%"><code>profile</code> </td><td valign="top" width="17%">ARMv8.2-A </td><td valign="top" width="17%">No
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</td><td valign="top" width="54%">Enable statistical profiling extensions.
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<br></td></tr></table>
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</body></html>
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