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| <a name="Register-names-1"></a> |
| <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> |
| |
| <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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