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88 lines
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88 lines
3.7 KiB
HTML
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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<title>Xtensa Registers (Using as)</title>
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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="Xtensa-Syntax.html#Xtensa-Syntax" rel="up" title="Xtensa Syntax">
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<link href="Xtensa-Optimizations.html#Xtensa-Optimizations" rel="next" title="Xtensa Optimizations">
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<a name="Xtensa-Registers"></a>
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<div class="header">
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<p>
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Previous: <a href="Xtensa-Opcodes.html#Xtensa-Opcodes" accesskey="p" rel="prev">Xtensa Opcodes</a>, Up: <a href="Xtensa-Syntax.html#Xtensa-Syntax" accesskey="u" rel="up">Xtensa Syntax</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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<hr>
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<a name="Register-Names-20"></a>
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<h4 class="subsubsection">9.54.2.2 Register Names</h4>
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<a name="index-Xtensa-register-names"></a>
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<a name="index-register-names_002c-Xtensa"></a>
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<a name="index-sp-register"></a>
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<p>The assembly syntax for a register file entry is the “short” name for
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a TIE register file followed by the index into that register file. For
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example, the general-purpose <code>AR</code> register file has a short name of
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<code>a</code>, so these registers are named <code>a0</code>…<code>a15</code>.
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As a special feature, <code>sp</code> is also supported as a synonym for
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<code>a1</code>. Additional registers may be added by processor configuration
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options and by designer-defined TIE extensions. An initial ‘<samp>$</samp>’
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character is optional in all register names.
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</p>
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