98 lines
5.0 KiB
HTML
98 lines
5.0 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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-->
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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: MMIX-Regs</title>
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<meta name="description" content="Using as: MMIX-Regs">
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<meta name="keywords" content="Using as: MMIX-Regs">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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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="MMIX_002dSyntax.html#MMIX_002dSyntax" rel="up" title="MMIX-Syntax">
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<link href="MMIX_002dPseudos.html#MMIX_002dPseudos" rel="next" title="MMIX-Pseudos">
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<link href="MMIX_002dSymbols.html#MMIX_002dSymbols" rel="prev" title="MMIX-Symbols">
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<style type="text/css">
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="MMIX_002dRegs"></a>
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<div class="header">
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<p>
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Next: <a href="MMIX_002dPseudos.html#MMIX_002dPseudos" accesskey="n" rel="next">MMIX-Pseudos</a>, Previous: <a href="MMIX_002dSymbols.html#MMIX_002dSymbols" accesskey="p" rel="prev">MMIX-Symbols</a>, Up: <a href="MMIX_002dSyntax.html#MMIX_002dSyntax" accesskey="u" rel="up">MMIX-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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</div>
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<hr>
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<a name="Register-names-1"></a>
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<h4 class="subsubsection">9.28.3.3 Register names</h4>
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<a name="index-register-names_002c-MMIX"></a>
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<a name="index-MMIX-register-names"></a>
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<p>Local and global registers are specified as ‘<samp>$0</samp>’ to ‘<samp>$255</samp>’.
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The recognized special register names are ‘<samp>rJ</samp>’, ‘<samp>rA</samp>’, ‘<samp>rB</samp>’,
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‘<samp>rC</samp>’, ‘<samp>rD</samp>’, ‘<samp>rE</samp>’, ‘<samp>rF</samp>’, ‘<samp>rG</samp>’, ‘<samp>rH</samp>’,
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‘<samp>rI</samp>’, ‘<samp>rK</samp>’, ‘<samp>rL</samp>’, ‘<samp>rM</samp>’, ‘<samp>rN</samp>’, ‘<samp>rO</samp>’,
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‘<samp>rP</samp>’, ‘<samp>rQ</samp>’, ‘<samp>rR</samp>’, ‘<samp>rS</samp>’, ‘<samp>rT</samp>’, ‘<samp>rU</samp>’,
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‘<samp>rV</samp>’, ‘<samp>rW</samp>’, ‘<samp>rX</samp>’, ‘<samp>rY</samp>’, ‘<samp>rZ</samp>’, ‘<samp>rBB</samp>’,
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‘<samp>rTT</samp>’, ‘<samp>rWW</samp>’, ‘<samp>rXX</samp>’, ‘<samp>rYY</samp>’ and ‘<samp>rZZ</samp>’. A leading
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‘<samp>:</samp>’ is optional for special register names.
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</p>
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<p>Local and global symbols can be equated to register names and used in
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place of ordinary registers.
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</p>
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<p>Similarly for special registers, local and global symbols can be used.
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Also, symbols equated from numbers and constant expressions are allowed in
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place of a special register, except when either of the options
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<code>--no-predefined-syms</code> and <code>--fixed-special-register-names</code> are
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specified. Then only the special register names above are allowed for the
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instructions having a special register operand; <code>GET</code> and <code>PUT</code>.
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</p>
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</body>
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</html>
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