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<a name="Xtensa-Registers"></a>Previous: <a rel="previous" accesskey="p" href="Xtensa-Opcodes.html#Xtensa-Opcodes">Xtensa Opcodes</a>,
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Up: <a rel="up" accesskey="u" href="Xtensa-Syntax.html#Xtensa-Syntax">Xtensa Syntax</a>
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<h5 class="subsubsection">9.36.2.2 Register Names</h5>
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<p><a name="index-Xtensa-register-names-1854"></a><a name="index-register-names_002c-Xtensa-1855"></a><a name="index-sp-register-1856"></a>
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The assembly syntax for a register file entry is the “short” name for
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a TIE register file followed by the index into that register file. For
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example, the general-purpose <code>AR</code> register file has a short name of
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<code>a</code>, so these registers are named <code>a0</code><small class="dots">...</small><code>a15</code>.
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As a special feature, <code>sp</code> is also supported as a synonym for
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<code>a1</code>. Additional registers may be added by processor configuration
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options and by designer-defined TIE extensions. An initial <span class="samp">$</span>
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character is optional in all register names.
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