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| <a name="Register-Names-15"></a> |
| <h4 class="subsubsection">9.44.2.2 Register Names</h4> |
| <a name="index-TILE_002dGx-register-names"></a> |
| <a name="index-register-names_002c-TILE_002dGx"></a> |
| |
| <p>General-purpose registers are represented by predefined symbols of the |
| form ‘<samp>r<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: |
| </p> |
| <dl compact="compact"> |
| <dt><code>r54</code></dt> |
| <dd><p>sp |
| </p> |
| </dd> |
| <dt><code>r55</code></dt> |
| <dd><p>lr |
| </p> |
| </dd> |
| <dt><code>r56</code></dt> |
| <dd><p>sn |
| </p> |
| </dd> |
| <dt><code>r57</code></dt> |
| <dd><p>idn0 |
| </p> |
| </dd> |
| <dt><code>r58</code></dt> |
| <dd><p>idn1 |
| </p> |
| </dd> |
| <dt><code>r59</code></dt> |
| <dd><p>udn0 |
| </p> |
| </dd> |
| <dt><code>r60</code></dt> |
| <dd><p>udn1 |
| </p> |
| </dd> |
| <dt><code>r61</code></dt> |
| <dd><p>udn2 |
| </p> |
| </dd> |
| <dt><code>r62</code></dt> |
| <dd><p>udn3 |
| </p> |
| </dd> |
| <dt><code>r63</code></dt> |
| <dd><p>zero |
| </p> |
| </dd> |
| </dl> |
| |
| <p>The assembler will emit a warning if a numeric name is used instead of |
| the non-numeric 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. |
| </p> |
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