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<link rel="prev" href="MMIX_002dSymbols.html#MMIX_002dSymbols" title="MMIX-Symbols">
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<a name="MMIX-Regs"></a>
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<p>
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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">9.28.3.3 Register names</h5>
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<p><a name="index-register-names_002c-MMIX-1575"></a><a name="index-MMIX-register-names-1576"></a>
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Local and global registers are specified as ‘<samp><span class="samp">$0</span></samp>’ to ‘<samp><span class="samp">$255</span></samp>’.
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The recognized special register names are ‘<samp><span class="samp">rJ</span></samp>’, ‘<samp><span class="samp">rA</span></samp>’, ‘<samp><span class="samp">rB</span></samp>’,
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‘<samp><span class="samp">rC</span></samp>’, ‘<samp><span class="samp">rD</span></samp>’, ‘<samp><span class="samp">rE</span></samp>’, ‘<samp><span class="samp">rF</span></samp>’, ‘<samp><span class="samp">rG</span></samp>’, ‘<samp><span class="samp">rH</span></samp>’,
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‘<samp><span class="samp">rI</span></samp>’, ‘<samp><span class="samp">rK</span></samp>’, ‘<samp><span class="samp">rL</span></samp>’, ‘<samp><span class="samp">rM</span></samp>’, ‘<samp><span class="samp">rN</span></samp>’, ‘<samp><span class="samp">rO</span></samp>’,
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‘<samp><span class="samp">rP</span></samp>’, ‘<samp><span class="samp">rQ</span></samp>’, ‘<samp><span class="samp">rR</span></samp>’, ‘<samp><span class="samp">rS</span></samp>’, ‘<samp><span class="samp">rT</span></samp>’, ‘<samp><span class="samp">rU</span></samp>’,
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‘<samp><span class="samp">rV</span></samp>’, ‘<samp><span class="samp">rW</span></samp>’, ‘<samp><span class="samp">rX</span></samp>’, ‘<samp><span class="samp">rY</span></samp>’, ‘<samp><span class="samp">rZ</span></samp>’, ‘<samp><span class="samp">rBB</span></samp>’,
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‘<samp><span class="samp">rTT</span></samp>’, ‘<samp><span class="samp">rWW</span></samp>’, ‘<samp><span class="samp">rXX</span></samp>’, ‘<samp><span class="samp">rYY</span></samp>’ and ‘<samp><span class="samp">rZZ</span></samp>’. A leading
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‘<samp><span class="samp">:</span></samp>’ 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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