<html lang="en">
<head>
<title>MMIX-Regs - Using as</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="Using as">
<meta name="generator" content="makeinfo 4.13">
<link title="Top" rel="start" href="index.html#Top">
<link rel="up" href="MMIX_002dSyntax.html#MMIX_002dSyntax" title="MMIX-Syntax">
<link rel="prev" href="MMIX_002dSymbols.html#MMIX_002dSymbols" title="MMIX-Symbols">
<link rel="next" href="MMIX_002dPseudos.html#MMIX_002dPseudos" title="MMIX-Pseudos">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
This file documents the GNU Assembler "as".

Copyright (C) 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
2000, 2001, 2002, 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.

Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3
or any later version published by the Free Software Foundation;
with no Invariant Sections, with no Front-Cover Texts, and with no
Back-Cover Texts.  A copy of the license is included in the
section entitled ``GNU Free Documentation License''.

-->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
  pre.display { font-family:inherit }
  pre.format  { font-family:inherit }
  pre.smalldisplay { font-family:inherit; font-size:smaller }
  pre.smallformat  { font-family:inherit; font-size:smaller }
  pre.smallexample { font-size:smaller }
  pre.smalllisp    { font-size:smaller }
  span.sc    { font-variant:small-caps }
  span.roman { font-family:serif; font-weight:normal; } 
  span.sansserif { font-family:sans-serif; font-weight:normal; } 
--></style>
<link rel="stylesheet" type="text/css" href="../cs.css">
</head>
<body>
<div class="node">
<a name="MMIX-Regs"></a>
<a name="MMIX_002dRegs"></a>
<p>
Next:&nbsp;<a rel="next" accesskey="n" href="MMIX_002dPseudos.html#MMIX_002dPseudos">MMIX-Pseudos</a>,
Previous:&nbsp;<a rel="previous" accesskey="p" href="MMIX_002dSymbols.html#MMIX_002dSymbols">MMIX-Symbols</a>,
Up:&nbsp;<a rel="up" accesskey="u" href="MMIX_002dSyntax.html#MMIX_002dSyntax">MMIX-Syntax</a>
<hr>
</div>

<h5 class="subsubsection">9.25.3.3 Register names</h5>

<p><a name="index-register-names_002c-MMIX-1328"></a><a name="index-MMIX-register-names-1329"></a>
Local and global registers are specified as &lsquo;<samp><span class="samp">$0</span></samp>&rsquo; to &lsquo;<samp><span class="samp">$255</span></samp>&rsquo;. 
The recognized special register names are &lsquo;<samp><span class="samp">rJ</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rA</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rB</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">rC</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rD</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rE</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rF</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rG</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rH</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">rI</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rK</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rL</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rM</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rN</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rO</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">rP</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rQ</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rR</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rS</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rT</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rU</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">rV</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rW</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rX</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rY</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rZ</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rBB</span></samp>&rsquo;,
&lsquo;<samp><span class="samp">rTT</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rWW</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rXX</span></samp>&rsquo;, &lsquo;<samp><span class="samp">rYY</span></samp>&rsquo; and &lsquo;<samp><span class="samp">rZZ</span></samp>&rsquo;.  A leading
&lsquo;<samp><span class="samp">:</span></samp>&rsquo; is optional for special register names.

   <p>Local and global symbols can be equated to register names and used in
place of ordinary registers.

   <p>Similarly for special registers, local and global symbols can be used. 
Also, symbols equated from numbers and constant expressions are allowed in
place of a special register, except when either of the options
<code>--no-predefined-syms</code> and <code>--fixed-special-register-names</code> are
specified.  Then only the special register names above are allowed for the
instructions having a special register operand; <code>GET</code> and <code>PUT</code>.

   </body></html>