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100 lines
4.2 KiB
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100 lines
4.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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or any later version published by the Free Software Foundation;
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<title>Z8000-Regs (Using as)</title>
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Z8000-Syntax.html#Z8000-Syntax" rel="up" title="Z8000 Syntax">
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<link href="Z8000_002dAddressing.html#Z8000_002dAddressing" rel="next" title="Z8000-Addressing">
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<a name="Z8000_002dRegs"></a>
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<div class="header">
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<p>
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Next: <a href="Z8000_002dAddressing.html#Z8000_002dAddressing" accesskey="n" rel="next">Z8000-Addressing</a>, Previous: <a href="Z8000_002dChars.html#Z8000_002dChars" accesskey="p" rel="prev">Z8000-Chars</a>, Up: <a href="Z8000-Syntax.html#Z8000-Syntax" accesskey="u" rel="up">Z8000 Syntax</a> [<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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</div>
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<hr>
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<a name="Register-Names-22"></a>
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<h4 class="subsubsection">9.56.2.2 Register Names</h4>
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<a name="index-Z8000-registers"></a>
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<a name="index-registers_002c-Z8000"></a>
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<p>The Z8000 has sixteen 16 bit registers, numbered 0 to 15. You can refer
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to different sized groups of registers by register number, with the
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prefix ‘<samp>r</samp>’ for 16 bit registers, ‘<samp>rr</samp>’ for 32 bit registers and
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‘<samp>rq</samp>’ for 64 bit registers. You can also refer to the contents of
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the first eight (of the sixteen 16 bit registers) by bytes. They are
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named ‘<samp>rl<var>n</var></samp>’ and ‘<samp>rh<var>n</var></samp>’.
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</p>
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<div class="smallexample">
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<pre class="smallexample"><em>byte registers</em>
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</pre><pre class="smallexample">rl0 rh0 rl1 rh1 rl2 rh2 rl3 rh3
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rl4 rh4 rl5 rh5 rl6 rh6 rl7 rh7
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</pre><pre class="smallexample"><em>word registers</em>
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</pre><pre class="smallexample">r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15
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</pre><pre class="smallexample"><em>long word registers</em>
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</pre><pre class="smallexample">rr0 rr2 rr4 rr6 rr8 rr10 rr12 rr14
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</pre><pre class="smallexample"><em>quad word registers</em>
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</pre><pre class="smallexample">rq0 rq4 rq8 rq12
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</pre></div>
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</body>
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