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| <h5 class="subsubsection">9.25.3.3 Register names</h5> |
| |
| <p><a name="index-register-names_002c-MMIX-1328"></a><a name="index-MMIX-register-names-1329"></a> |
| Local and global registers are specified as ‘<samp><span class="samp">$0</span></samp>’ to ‘<samp><span class="samp">$255</span></samp>’. |
| 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>’, |
| ‘<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>’, |
| ‘<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>’, |
| ‘<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>’, |
| ‘<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>’, |
| ‘<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 |
| ‘<samp><span class="samp">:</span></samp>’ is optional for special register names. |
| |
| <p>Local and global symbols can be equated to register names and used in |
| place of ordinary registers. |
| |
| <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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