<html lang="en">
<head>
<title>Machine Dependencies - Using as</title>
<meta http-equiv="Content-Type" content="text/html">
<meta name="description" content="Using as">
<meta name="generator" content="makeinfo 4.7">
<link title="Top" rel="start" href="index.html#Top">
<link rel="prev" href="Object-Attributes.html#Object-Attributes" title="Object Attributes">
<link rel="next" href="Reporting-Bugs.html#Reporting-Bugs" title="Reporting Bugs">
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
<!--
This file documents the GNU Assembler "as".
Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
2006, 2007 Free Software Foundation, Inc.
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.1
or any later version published by the Free Software Foundation;
with no Invariant Sections, with no Front-Cover Texts, and with no
Back-Cover Texts. A copy of the license is included in the
section entitled ``GNU Free Documentation License''.
man end-->
<meta http-equiv="Content-Style-Type" content="text/css">
<style type="text/css"><!--
pre.display { font-family:inherit }
pre.format { font-family:inherit }
pre.smalldisplay { font-family:inherit; font-size:smaller }
pre.smallformat { font-family:inherit; font-size:smaller }
pre.smallexample { font-size:smaller }
pre.smalllisp { font-size:smaller }
span.sc { font-variant:small-caps }
span.roman { font-family: serif; font-weight: normal; }
--></style>
</head>
<body>
<div class="node">
<p>
<a name="Machine-Dependencies"></a>Next: <a rel="next" accesskey="n" href="Reporting-Bugs.html#Reporting-Bugs">Reporting Bugs</a>,
Previous: <a rel="previous" accesskey="p" href="Object-Attributes.html#Object-Attributes">Object Attributes</a>,
Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
<hr><br>
</div>
<h2 class="chapter">9 Machine Dependent Features</h2>
<p><a name="index-machine-dependencies-505"></a>The machine instruction sets are (almost by definition) different on
each machine where <span class="command">as</span> runs. Floating point representations
vary as well, and <span class="command">as</span> often supports a few additional
directives or command-line options for compatibility with other
assemblers on a particular platform. Finally, some versions of
<span class="command">as</span> support special pseudo-instructions for branch
optimization.
<p>This chapter discusses most of these differences, though it does not
include details on any machine's instruction set. For details on that
subject, see the hardware manufacturer's manual.
<ul class="menu">
<li><a accesskey="1" href="Alpha_002dDependent.html#Alpha_002dDependent">Alpha-Dependent</a>: Alpha Dependent Features
<li><a accesskey="2" href="ARC_002dDependent.html#ARC_002dDependent">ARC-Dependent</a>: ARC Dependent Features
<li><a accesskey="3" href="ARM_002dDependent.html#ARM_002dDependent">ARM-Dependent</a>: ARM Dependent Features
<li><a accesskey="4" href="AVR_002dDependent.html#AVR_002dDependent">AVR-Dependent</a>: AVR Dependent Features
<li><a accesskey="5" href="BFIN_002dDependent.html#BFIN_002dDependent">BFIN-Dependent</a>: BFIN Dependent Features
<li><a accesskey="6" href="CR16_002dDependent.html#CR16_002dDependent">CR16-Dependent</a>: CR16 Dependent Features
<li><a accesskey="7" href="CRIS_002dDependent.html#CRIS_002dDependent">CRIS-Dependent</a>: CRIS Dependent Features
<li><a accesskey="8" href="D10V_002dDependent.html#D10V_002dDependent">D10V-Dependent</a>: D10V Dependent Features
<li><a accesskey="9" href="D30V_002dDependent.html#D30V_002dDependent">D30V-Dependent</a>: D30V Dependent Features
<li><a href="H8_002f300_002dDependent.html#H8_002f300_002dDependent">H8/300-Dependent</a>: Renesas H8/300 Dependent Features
<li><a href="HPPA_002dDependent.html#HPPA_002dDependent">HPPA-Dependent</a>: HPPA Dependent Features
<li><a href="ESA_002f390_002dDependent.html#ESA_002f390_002dDependent">ESA/390-Dependent</a>: IBM ESA/390 Dependent Features
<li><a href="i386_002dDependent.html#i386_002dDependent">i386-Dependent</a>: Intel 80386 and AMD x86-64 Dependent Features
<li><a href="i860_002dDependent.html#i860_002dDependent">i860-Dependent</a>: Intel 80860 Dependent Features
<li><a href="i960_002dDependent.html#i960_002dDependent">i960-Dependent</a>: Intel 80960 Dependent Features
<li><a href="IA_002d64_002dDependent.html#IA_002d64_002dDependent">IA-64-Dependent</a>: Intel IA-64 Dependent Features
<li><a href="IP2K_002dDependent.html#IP2K_002dDependent">IP2K-Dependent</a>: IP2K Dependent Features
<li><a href="M32C_002dDependent.html#M32C_002dDependent">M32C-Dependent</a>: M32C Dependent Features
<li><a href="M32R_002dDependent.html#M32R_002dDependent">M32R-Dependent</a>: M32R Dependent Features
<li><a href="M68K_002dDependent.html#M68K_002dDependent">M68K-Dependent</a>: M680x0 Dependent Features
<li><a href="M68HC11_002dDependent.html#M68HC11_002dDependent">M68HC11-Dependent</a>: M68HC11 and 68HC12 Dependent Features
<li><a href="MIPS_002dDependent.html#MIPS_002dDependent">MIPS-Dependent</a>: MIPS Dependent Features
<li><a href="MMIX_002dDependent.html#MMIX_002dDependent">MMIX-Dependent</a>: MMIX Dependent Features
<li><a href="MSP430_002dDependent.html#MSP430_002dDependent">MSP430-Dependent</a>: MSP430 Dependent Features
<li><a href="SH_002dDependent.html#SH_002dDependent">SH-Dependent</a>: Renesas / SuperH SH Dependent Features
<li><a href="SH64_002dDependent.html#SH64_002dDependent">SH64-Dependent</a>: SuperH SH64 Dependent Features
<li><a href="PDP_002d11_002dDependent.html#PDP_002d11_002dDependent">PDP-11-Dependent</a>: PDP-11 Dependent Features
<li><a href="PJ_002dDependent.html#PJ_002dDependent">PJ-Dependent</a>: picoJava Dependent Features
<li><a href="PPC_002dDependent.html#PPC_002dDependent">PPC-Dependent</a>: PowerPC Dependent Features
<li><a href="Sparc_002dDependent.html#Sparc_002dDependent">Sparc-Dependent</a>: SPARC Dependent Features
<li><a href="TIC54X_002dDependent.html#TIC54X_002dDependent">TIC54X-Dependent</a>: TI TMS320C54x Dependent Features
<li><a href="V850_002dDependent.html#V850_002dDependent">V850-Dependent</a>: V850 Dependent Features
<li><a href="Xtensa_002dDependent.html#Xtensa_002dDependent">Xtensa-Dependent</a>: Xtensa Dependent Features
<li><a href="Z80_002dDependent.html#Z80_002dDependent">Z80-Dependent</a>: Z80 Dependent Features
<li><a href="Z8000_002dDependent.html#Z8000_002dDependent">Z8000-Dependent</a>: Z8000 Dependent Features
<li><a href="Vax_002dDependent.html#Vax_002dDependent">Vax-Dependent</a>: VAX Dependent Features
</ul>
<!-- The following major nodes are *sections* in the GENERIC version, *chapters* -->
<!-- in single-cpu versions. This is mainly achieved by @lowersections. There is a -->
<!-- peculiarity: to preserve cross-references, there must be a node called -->
<!-- "Machine Dependencies". Hence the conditional nodenames in each -->
<!-- major node below. Node defaulting in makeinfo requires adjacency of -->
<!-- node and sectioning commands; hence the repetition of @chapter BLAH -->
<!-- in both conditional blocks. -->
<!-- Copyright 2002, 2003 -->
<!-- Free Software Foundation, Inc. -->
<!-- This is part of the GAS manual. -->
<!-- For copying conditions, see the file as.texinfo. -->
</body></html>