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66Next: <a href="TILEPro-Modifiers.html#TILEPro-Modifiers" accesskey="n" rel="next">TILEPro Modifiers</a>, Previous: <a href="TILEPro-Opcodes.html#TILEPro-Opcodes" accesskey="p" rel="previous">TILEPro Opcodes</a>, Up: <a href="TILEPro-Syntax.html#TILEPro-Syntax" accesskey="u" rel="up">TILEPro Syntax</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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69<a name="Register-Names-18"></a>
70<h4 class="subsubsection">9.48.2.2 Register Names</h4>
71<a name="index-TILEPro-register-names"></a>
72<a name="index-register-names_002c-TILEPro"></a>
73
74<p>General-purpose registers are represented by predefined symbols of the
75form &lsquo;<samp>r<var>N</var></samp>&rsquo;, where <var>N</var> represents a number between
76<code>0</code> and <code>63</code>.  However, the following registers have
77canonical names that must be used instead:
78</p>
79<dl compact="compact">
80<dt><code>r54</code></dt>
81<dd><p>sp
82</p>
83</dd>
84<dt><code>r55</code></dt>
85<dd><p>lr
86</p>
87</dd>
88<dt><code>r56</code></dt>
89<dd><p>sn
90</p>
91</dd>
92<dt><code>r57</code></dt>
93<dd><p>idn0
94</p>
95</dd>
96<dt><code>r58</code></dt>
97<dd><p>idn1
98</p>
99</dd>
100<dt><code>r59</code></dt>
101<dd><p>udn0
102</p>
103</dd>
104<dt><code>r60</code></dt>
105<dd><p>udn1
106</p>
107</dd>
108<dt><code>r61</code></dt>
109<dd><p>udn2
110</p>
111</dd>
112<dt><code>r62</code></dt>
113<dd><p>udn3
114</p>
115</dd>
116<dt><code>r63</code></dt>
117<dd><p>zero
118</p>
119</dd>
120</dl>
121
122<p>The assembler will emit a warning if a numeric name is used instead of
123the canonical name.  The <code>.no_require_canonical_reg_names</code>
124assembler pseudo-op turns off this
125warning. <code>.require_canonical_reg_names</code> turns it back on.
126</p>
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