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60 lines
2.7 KiB
HTML
60 lines
2.7 KiB
HTML
4 years ago
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<html lang="en">
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<title>Xtensa Registers - Using as</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="Using as">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Xtensa-Syntax.html#Xtensa-Syntax" title="Xtensa Syntax">
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<link rel="prev" href="Xtensa-Opcodes.html#Xtensa-Opcodes" title="Xtensa Opcodes">
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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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-->
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<style type="text/css"><!--
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pre.display { font-family:inherit }
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pre.format { font-family:inherit }
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span.sc { font-variant:small-caps }
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span.roman { font-family:serif; font-weight:normal; }
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span.sansserif { font-family:sans-serif; font-weight:normal; }
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--></style>
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</head>
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<body>
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<div class="node">
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<a name="Xtensa-Registers"></a>
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<p>
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Previous: <a rel="previous" accesskey="p" href="Xtensa-Opcodes.html#Xtensa-Opcodes">Xtensa Opcodes</a>,
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Up: <a rel="up" accesskey="u" href="Xtensa-Syntax.html#Xtensa-Syntax">Xtensa Syntax</a>
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<hr>
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</div>
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<h5 class="subsubsection">9.52.2.2 Register Names</h5>
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<p><a name="index-Xtensa-register-names-2456"></a><a name="index-register-names_002c-Xtensa-2457"></a><a name="index-sp-register-2458"></a>
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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><small class="dots">...</small><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><span class="samp">$</span></samp>’
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character is optional in all register names.
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</body></html>
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