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- <a name="Register-Names-9"></a>
- <h4 class="subsubsection">9.17.2.2 Register Names</h4>
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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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