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| <a name="Register-Names-8"></a> |
| <h4 class="subsubsection">9.18.2.2 Register Names</h4> |
| <a name="index-IA_002d64-registers"></a> |
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| <p>The 128 integer registers are referred to as ‘<samp>r<var>n</var></samp>’. |
| The 128 floating-point registers are referred to as ‘<samp>f<var>n</var></samp>’. |
| The 128 application registers are referred to as ‘<samp>ar<var>n</var></samp>’. |
| The 128 control registers are referred to as ‘<samp>cr<var>n</var></samp>’. |
| The 64 one-bit predicate registers are referred to as ‘<samp>p<var>n</var></samp>’. |
| The 8 branch registers are referred to as ‘<samp>b<var>n</var></samp>’. |
| In addition, the assembler defines a number of aliases: |
| ‘<samp>gp</samp>’ (‘<samp>r1</samp>’), ‘<samp>sp</samp>’ (‘<samp>r12</samp>’), ‘<samp>rp</samp>’ (‘<samp>b0</samp>’), |
| ‘<samp>ret0</samp>’ (‘<samp>r8</samp>’), ‘<samp>ret1</samp>’ (‘<samp>r9</samp>’), ‘<samp>ret2</samp>’ (‘<samp>r10</samp>’), |
| ‘<samp>ret3</samp>’ (‘<samp>r9</samp>’), ‘<samp>farg<var>n</var></samp>’ (‘<samp>f8+<var>n</var></samp>’), and |
| ‘<samp>fret<var>n</var></samp>’ (‘<samp>f8+<var>n</var></samp>’). |
| </p> |
| <p>For convenience, the assembler also defines aliases for all named application |
| and control registers. For example, ‘<samp>ar.bsp</samp>’ refers to the register |
| backing store pointer (‘<samp>ar17</samp>’). Similarly, ‘<samp>cr.eoi</samp>’ refers to |
| the end-of-interrupt register (‘<samp>cr67</samp>’). |
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