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<title>MMIX-Regs - Using as</title>
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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<p>
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<a name="MMIX_002dRegs"></a>Next: <a rel="next" accesskey="n" href="MMIX_002dPseudos.html#MMIX_002dPseudos">MMIX-Pseudos</a>,
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Previous: <a rel="previous" accesskey="p" href="MMIX_002dSymbols.html#MMIX_002dSymbols">MMIX-Symbols</a>,
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Up: <a rel="up" accesskey="u" href="MMIX_002dSyntax.html#MMIX_002dSyntax">MMIX-Syntax</a>
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<h5 class="subsubsection">9.23.3.3 Register names</h5>
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<p><a name="index-register-names_002c-MMIX-1266"></a><a name="index-MMIX-register-names-1267"></a>
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Local and global registers are specified as <span class="samp">$0</span> to <span class="samp">$255</span>.
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The recognized special register names are <span class="samp">rJ</span>, <span class="samp">rA</span>, <span class="samp">rB</span>,
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<span class="samp">rC</span>, <span class="samp">rD</span>, <span class="samp">rE</span>, <span class="samp">rF</span>, <span class="samp">rG</span>, <span class="samp">rH</span>,
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<span class="samp">rI</span>, <span class="samp">rK</span>, <span class="samp">rL</span>, <span class="samp">rM</span>, <span class="samp">rN</span>, <span class="samp">rO</span>,
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<span class="samp">rP</span>, <span class="samp">rQ</span>, <span class="samp">rR</span>, <span class="samp">rS</span>, <span class="samp">rT</span>, <span class="samp">rU</span>,
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<span class="samp">rV</span>, <span class="samp">rW</span>, <span class="samp">rX</span>, <span class="samp">rY</span>, <span class="samp">rZ</span>, <span class="samp">rBB</span>,
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<span class="samp">rTT</span>, <span class="samp">rWW</span>, <span class="samp">rXX</span>, <span class="samp">rYY</span> and <span class="samp">rZZ</span>. A leading
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<span class="samp">:</span> is optional for special register names.
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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>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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