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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.

  6. 

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

  8. under the terms of the GNU Free Documentation License, Version 1.3

  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".

  13.  -->

  14. <!-- Created by GNU Texinfo 6.5, http://www.gnu.org/software/texinfo/ -->

  15. <head>

  16. <meta http-equiv="Content-Type" content="text/html; charset=utf-8">

  17. <title>IA-64-Regs (Using as)</title>

  18. 

  19. <meta name="description" content="IA-64-Regs (Using as)">

  20. <meta name="keywords" content="IA-64-Regs (Using as)">

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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="IA_002d64-Syntax.html#IA_002d64-Syntax" rel="up" title="IA-64 Syntax">

  28. <link href="IA_002d64_002dBits.html#IA_002d64_002dBits" rel="next" title="IA-64-Bits">

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  61. <body lang="en">

  62. <a name="IA_002d64_002dRegs"></a>

  63. <div class="header">

  64. <p>

  65. Next: <a href="IA_002d64_002dBits.html#IA_002d64_002dBits" accesskey="n" rel="next">IA-64-Bits</a>, Previous: <a href="IA_002d64_002dChars.html#IA_002d64_002dChars" accesskey="p" rel="prev">IA-64-Chars</a>, Up: <a href="IA_002d64-Syntax.html#IA_002d64-Syntax" accesskey="u" rel="up">IA-64 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-9"></a>

  69. <h4 class="subsubsection">9.17.2.2 Register Names</h4>

  70. <a name="index-IA_002d64-registers"></a>

  71. <a name="index-register-names_002c-IA_002d64"></a>

  72. 

  73. <p>The 128 integer registers are referred to as &lsquo;<samp>r<var>n</var></samp>&rsquo;.

  74. The 128 floating-point registers are referred to as &lsquo;<samp>f<var>n</var></samp>&rsquo;.

  75. The 128 application registers are referred to as &lsquo;<samp>ar<var>n</var></samp>&rsquo;.

  76. The 128 control registers are referred to as &lsquo;<samp>cr<var>n</var></samp>&rsquo;.

  77. The 64 one-bit predicate registers are referred to as &lsquo;<samp>p<var>n</var></samp>&rsquo;.

  78. The 8 branch registers are referred to as &lsquo;<samp>b<var>n</var></samp>&rsquo;.

  79. In addition, the assembler defines a number of aliases:

  80. &lsquo;<samp>gp</samp>&rsquo; (&lsquo;<samp>r1</samp>&rsquo;), &lsquo;<samp>sp</samp>&rsquo; (&lsquo;<samp>r12</samp>&rsquo;), &lsquo;<samp>rp</samp>&rsquo; (&lsquo;<samp>b0</samp>&rsquo;),

  81. &lsquo;<samp>ret0</samp>&rsquo; (&lsquo;<samp>r8</samp>&rsquo;), &lsquo;<samp>ret1</samp>&rsquo; (&lsquo;<samp>r9</samp>&rsquo;), &lsquo;<samp>ret2</samp>&rsquo; (&lsquo;<samp>r10</samp>&rsquo;),

  82. &lsquo;<samp>ret3</samp>&rsquo; (&lsquo;<samp>r9</samp>&rsquo;), &lsquo;<samp>farg<var>n</var></samp>&rsquo; (&lsquo;<samp>f8+<var>n</var></samp>&rsquo;), and

  83. &lsquo;<samp>fret<var>n</var></samp>&rsquo; (&lsquo;<samp>f8+<var>n</var></samp>&rsquo;).

  84. </p>

  85. <p>For convenience, the assembler also defines aliases for all named application

  86. and control registers.  For example, &lsquo;<samp>ar.bsp</samp>&rsquo; refers to the register

  87. backing store pointer (&lsquo;<samp>ar17</samp>&rsquo;).  Similarly, &lsquo;<samp>cr.eoi</samp>&rsquo; refers to

  88. the end-of-interrupt register (&lsquo;<samp>cr67</samp>&rsquo;).

  89. </p>

  90. 

  91. 

  92. 

  93. </body>

  94. </html>