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95 lines
4.8 KiB
HTML
95 lines
4.8 KiB
HTML
4 years ago
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<!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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under the terms of the GNU Free Documentation License, Version 1.3
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>IA-64-Regs (Using as)</title>
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<meta name="description" content="IA-64-Regs (Using as)">
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<meta name="keywords" content="IA-64-Regs (Using as)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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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="IA_002d64-Syntax.html#IA_002d64-Syntax" rel="up" title="IA-64 Syntax">
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<link href="IA_002d64_002dBits.html#IA_002d64_002dBits" rel="next" title="IA-64-Bits">
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<link href="IA_002d64_002dChars.html#IA_002d64_002dChars" rel="prev" title="IA-64-Chars">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="IA_002d64_002dRegs"></a>
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<div class="header">
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<p>
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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> [<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-8"></a>
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<h4 class="subsubsection">9.16.2.2 Register Names</h4>
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<a name="index-IA_002d64-registers"></a>
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<a name="index-register-names_002c-IA_002d64"></a>
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<p>The 128 integer registers are referred to as ‘<samp>r<var>n</var></samp>’.
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The 128 floating-point registers are referred to as ‘<samp>f<var>n</var></samp>’.
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The 128 application registers are referred to as ‘<samp>ar<var>n</var></samp>’.
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The 128 control registers are referred to as ‘<samp>cr<var>n</var></samp>’.
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The 64 one-bit predicate registers are referred to as ‘<samp>p<var>n</var></samp>’.
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The 8 branch registers are referred to as ‘<samp>b<var>n</var></samp>’.
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In addition, the assembler defines a number of aliases:
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‘<samp>gp</samp>’ (‘<samp>r1</samp>’), ‘<samp>sp</samp>’ (‘<samp>r12</samp>’), ‘<samp>rp</samp>’ (‘<samp>b0</samp>’),
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‘<samp>ret0</samp>’ (‘<samp>r8</samp>’), ‘<samp>ret1</samp>’ (‘<samp>r9</samp>’), ‘<samp>ret2</samp>’ (‘<samp>r10</samp>’),
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‘<samp>ret3</samp>’ (‘<samp>r9</samp>’), ‘<samp>farg<var>n</var></samp>’ (‘<samp>f8+<var>n</var></samp>’), and
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‘<samp>fret<var>n</var></samp>’ (‘<samp>f8+<var>n</var></samp>’).
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</p>
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<p>For convenience, the assembler also defines aliases for all named application
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and control registers. For example, ‘<samp>ar.bsp</samp>’ refers to the register
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backing store pointer (‘<samp>ar17</samp>’). Similarly, ‘<samp>cr.eoi</samp>’ refers to
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the end-of-interrupt register (‘<samp>cr67</samp>’).
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</p>
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</body>
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</html>
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