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| <h5 class="subsubsection">9.42.2.2 Register Names</h5> |
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| <p><a name="index-Xtensa-register-names-2015"></a><a name="index-register-names_002c-Xtensa-2016"></a><a name="index-sp-register-2017"></a> |
| The assembly syntax for a register file entry is the “short” name for |
| a TIE register file followed by the index into that register file. For |
| example, the general-purpose <code>AR</code> register file has a short name of |
| <code>a</code>, so these registers are named <code>a0</code><small class="dots">...</small><code>a15</code>. |
| As a special feature, <code>sp</code> is also supported as a synonym for |
| <code>a1</code>. Additional registers may be added by processor configuration |
| options and by designer-defined TIE extensions. An initial ‘<samp><span class="samp">$</span></samp>’ |
| character is optional in all register names. |
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