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- <h4 class="subsubsection">9.28.3.3 Register names</h4>
- <a name="index-register-names_002c-MMIX"></a>
- <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>’.
- The recognized special register names are ‘<samp>rJ</samp>’, ‘<samp>rA</samp>’, ‘<samp>rB</samp>’,
- ‘<samp>rC</samp>’, ‘<samp>rD</samp>’, ‘<samp>rE</samp>’, ‘<samp>rF</samp>’, ‘<samp>rG</samp>’, ‘<samp>rH</samp>’,
- ‘<samp>rI</samp>’, ‘<samp>rK</samp>’, ‘<samp>rL</samp>’, ‘<samp>rM</samp>’, ‘<samp>rN</samp>’, ‘<samp>rO</samp>’,
- ‘<samp>rP</samp>’, ‘<samp>rQ</samp>’, ‘<samp>rR</samp>’, ‘<samp>rS</samp>’, ‘<samp>rT</samp>’, ‘<samp>rU</samp>’,
- ‘<samp>rV</samp>’, ‘<samp>rW</samp>’, ‘<samp>rX</samp>’, ‘<samp>rY</samp>’, ‘<samp>rZ</samp>’, ‘<samp>rBB</samp>’,
- ‘<samp>rTT</samp>’, ‘<samp>rWW</samp>’, ‘<samp>rXX</samp>’, ‘<samp>rYY</samp>’ and ‘<samp>rZZ</samp>’. A leading
- ‘<samp>:</samp>’ is optional for special register names.
- </p>
- <p>Local and global symbols can be equated to register names and used in
- place of ordinary registers.
- </p>
- <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>.
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