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97 lines
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97 lines
4.9 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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<title>MMIX-Regs (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="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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<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">9.27.3.3 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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