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<h5 class="subsubsection">9.46.2.2 Register Names</h5>
<p><a name="index-TILEPro-register-names-2245"></a><a name="index-register-names_002c-TILEPro-2246"></a>
General-purpose registers are represented by predefined symbols of the
form ‘<samp><span class="samp">r</span><var>N</var></samp>’, where <var>N</var> represents a number between
<code>0</code> and <code>63</code>. However, the following registers have
canonical names that must be used instead:
<dl>
<dt><code>r54</code><dd>sp
<br><dt><code>r55</code><dd>lr
<br><dt><code>r56</code><dd>sn
<br><dt><code>r57</code><dd>idn0
<br><dt><code>r58</code><dd>idn1
<br><dt><code>r59</code><dd>udn0
<br><dt><code>r60</code><dd>udn1
<br><dt><code>r61</code><dd>udn2
<br><dt><code>r62</code><dd>udn3
<br><dt><code>r63</code><dd>zero
</dl>
<p>The assembler will emit a warning if a numeric name is used instead of
the canonical name. The <code>.no_require_canonical_reg_names</code>
assembler pseudo-op turns off this
warning. <code>.require_canonical_reg_names</code> turns it back on.
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