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<h5 class="subsubsection">9.57.2.2 Register Names</h5>

<p><a name="index-Z8000-registers-2703"></a><a name="index-registers_002c-Z8000-2704"></a>The Z8000 has sixteen 16 bit registers, numbered 0 to 15.  You can refer
to different sized groups of registers by register number, with the
prefix &lsquo;<samp><span class="samp">r</span></samp>&rsquo; for 16 bit registers, &lsquo;<samp><span class="samp">rr</span></samp>&rsquo; for 32 bit registers and
&lsquo;<samp><span class="samp">rq</span></samp>&rsquo; for 64 bit registers.  You can also refer to the contents of
the first eight (of the sixteen 16 bit registers) by bytes.  They are
named &lsquo;<samp><span class="samp">rl</span><var>n</var></samp>&rsquo; and &lsquo;<samp><span class="samp">rh</span><var>n</var></samp>&rsquo;.

<pre class="smallexample"><br><em>byte registers</em><br>
     rl0 rh0 rl1 rh1 rl2 rh2 rl3 rh3
     rl4 rh4 rl5 rh5 rl6 rh6 rl7 rh7
     
<br><em>word registers</em><br>
     r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15
     
<br><em>long word registers</em><br>
     rr0 rr2 rr4 rr6 rr8 rr10 rr12 rr14
     
<br><em>quad word registers</em><br>
     rq0 rq4 rq8 rq12
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