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  1. <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

  2. <html>

  3. <!-- This file documents the GNU Assembler "as".

  4. 

  5. Copyright (C) 1991-2020 Free Software Foundation, Inc.

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  7. Permission is granted to copy, distribute and/or modify this document

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  9. or any later version published by the Free Software Foundation;

  10. with no Invariant Sections, with no Front-Cover Texts, and with no

  11. Back-Cover Texts.  A copy of the license is included in the

  12. section entitled "GNU Free Documentation License".

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  15. <head>

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  17. <title>Z8000-Regs (Using as)</title>

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  25. <link href="AS-Index.html#AS-Index" rel="index" title="AS Index">

  26. <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">

  27. <link href="Z8000-Syntax.html#Z8000-Syntax" rel="up" title="Z8000 Syntax">

  28. <link href="Z8000_002dAddressing.html#Z8000_002dAddressing" rel="next" title="Z8000-Addressing">

  29. <link href="Z8000_002dChars.html#Z8000_002dChars" rel="prev" title="Z8000-Chars">

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  62. <a name="Z8000_002dRegs"></a>

  63. <div class="header">

  64. <p>

  65. 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> &nbsp; [<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>

  66. </div>

  67. <hr>

  68. <a name="Register-Names-23"></a>

  69. <h4 class="subsubsection">9.57.2.2 Register Names</h4>

  70. 

  71. <a name="index-Z8000-registers"></a>

  72. <a name="index-registers_002c-Z8000"></a>

  73. <p>The Z8000 has sixteen 16 bit registers, numbered 0 to 15.  You can refer

  74. to different sized groups of registers by register number, with the

  75. prefix &lsquo;<samp>r</samp>&rsquo; for 16 bit registers, &lsquo;<samp>rr</samp>&rsquo; for 32 bit registers and

  76. &lsquo;<samp>rq</samp>&rsquo; for 64 bit registers.  You can also refer to the contents of

  77. the first eight (of the sixteen 16 bit registers) by bytes.  They are

  78. named &lsquo;<samp>rl<var>n</var></samp>&rsquo; and &lsquo;<samp>rh<var>n</var></samp>&rsquo;.

  79. </p>

  80. <div class="smallexample">

  81. <pre class="smallexample"><em>byte registers</em>

  82. </pre><pre class="smallexample">rl0 rh0 rl1 rh1 rl2 rh2 rl3 rh3

  83. rl4 rh4 rl5 rh5 rl6 rh6 rl7 rh7

  84. 

  85. </pre><pre class="smallexample"><em>word registers</em>

  86. </pre><pre class="smallexample">r0 r1 r2 r3 r4 r5 r6 r7 r8 r9 r10 r11 r12 r13 r14 r15

  87. 

  88. </pre><pre class="smallexample"><em>long word registers</em>

  89. </pre><pre class="smallexample">rr0 rr2 rr4 rr6 rr8 rr10 rr12 rr14

  90. 

  91. </pre><pre class="smallexample"><em>quad word registers</em>

  92. </pre><pre class="smallexample">rq0 rq4 rq8 rq12

  93. </pre></div>

  94. 

  95. 

  96. 

  97. 

  98. </body>

  99. </html>