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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 Free Software Foundation, Inc.
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<a name="Machine-Dependencies"></a>Next: <a rel="next" accesskey="n" href="Reporting-Bugs.html#Reporting-Bugs">Reporting Bugs</a>,
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Previous: <a rel="previous" accesskey="p" href="Object-Attributes.html#Object-Attributes">Object Attributes</a>,
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Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a>
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<hr><br>
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</div>
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<h2 class="chapter">9 Machine Dependent Features</h2>
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<p><a name="index-machine-dependencies-505"></a>The machine instruction sets are (almost by definition) different on
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each machine where <span class="command">as</span> runs. Floating point representations
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vary as well, and <span class="command">as</span> often supports a few additional
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directives or command-line options for compatibility with other
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assemblers on a particular platform. Finally, some versions of
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<span class="command">as</span> support special pseudo-instructions for branch
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optimization.
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<p>This chapter discusses most of these differences, though it does not
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include details on any machine's instruction set. For details on that
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subject, see the hardware manufacturer's manual.
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<ul class="menu">
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<li><a accesskey="1" href="Alpha_002dDependent.html#Alpha_002dDependent">Alpha-Dependent</a>: Alpha Dependent Features
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<li><a accesskey="2" href="ARC_002dDependent.html#ARC_002dDependent">ARC-Dependent</a>: ARC Dependent Features
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<li><a accesskey="3" href="ARM_002dDependent.html#ARM_002dDependent">ARM-Dependent</a>: ARM Dependent Features
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<li><a accesskey="4" href="AVR_002dDependent.html#AVR_002dDependent">AVR-Dependent</a>: AVR Dependent Features
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<li><a accesskey="5" href="BFIN_002dDependent.html#BFIN_002dDependent">BFIN-Dependent</a>: BFIN Dependent Features
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<li><a accesskey="6" href="CR16_002dDependent.html#CR16_002dDependent">CR16-Dependent</a>: CR16 Dependent Features
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<li><a accesskey="7" href="CRIS_002dDependent.html#CRIS_002dDependent">CRIS-Dependent</a>: CRIS Dependent Features
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<li><a accesskey="8" href="D10V_002dDependent.html#D10V_002dDependent">D10V-Dependent</a>: D10V Dependent Features
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<li><a accesskey="9" href="D30V_002dDependent.html#D30V_002dDependent">D30V-Dependent</a>: D30V Dependent Features
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<li><a href="H8_002f300_002dDependent.html#H8_002f300_002dDependent">H8/300-Dependent</a>: Renesas H8/300 Dependent Features
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<li><a href="HPPA_002dDependent.html#HPPA_002dDependent">HPPA-Dependent</a>: HPPA Dependent Features
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<li><a href="ESA_002f390_002dDependent.html#ESA_002f390_002dDependent">ESA/390-Dependent</a>: IBM ESA/390 Dependent Features
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<li><a href="i386_002dDependent.html#i386_002dDependent">i386-Dependent</a>: Intel 80386 and AMD x86-64 Dependent Features
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<li><a href="i860_002dDependent.html#i860_002dDependent">i860-Dependent</a>: Intel 80860 Dependent Features
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<li><a href="i960_002dDependent.html#i960_002dDependent">i960-Dependent</a>: Intel 80960 Dependent Features
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<li><a href="IA_002d64_002dDependent.html#IA_002d64_002dDependent">IA-64-Dependent</a>: Intel IA-64 Dependent Features
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<li><a href="IP2K_002dDependent.html#IP2K_002dDependent">IP2K-Dependent</a>: IP2K Dependent Features
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<li><a href="M32C_002dDependent.html#M32C_002dDependent">M32C-Dependent</a>: M32C Dependent Features
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<li><a href="M32R_002dDependent.html#M32R_002dDependent">M32R-Dependent</a>: M32R Dependent Features
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<li><a href="M68K_002dDependent.html#M68K_002dDependent">M68K-Dependent</a>: M680x0 Dependent Features
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<li><a href="M68HC11_002dDependent.html#M68HC11_002dDependent">M68HC11-Dependent</a>: M68HC11 and 68HC12 Dependent Features
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<li><a href="MIPS_002dDependent.html#MIPS_002dDependent">MIPS-Dependent</a>: MIPS Dependent Features
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<li><a href="MMIX_002dDependent.html#MMIX_002dDependent">MMIX-Dependent</a>: MMIX Dependent Features
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<li><a href="MSP430_002dDependent.html#MSP430_002dDependent">MSP430-Dependent</a>: MSP430 Dependent Features
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<li><a href="SH_002dDependent.html#SH_002dDependent">SH-Dependent</a>: Renesas / SuperH SH Dependent Features
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<li><a href="SH64_002dDependent.html#SH64_002dDependent">SH64-Dependent</a>: SuperH SH64 Dependent Features
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<li><a href="PDP_002d11_002dDependent.html#PDP_002d11_002dDependent">PDP-11-Dependent</a>: PDP-11 Dependent Features
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<li><a href="PJ_002dDependent.html#PJ_002dDependent">PJ-Dependent</a>: picoJava Dependent Features
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<li><a href="PPC_002dDependent.html#PPC_002dDependent">PPC-Dependent</a>: PowerPC Dependent Features
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<li><a href="Sparc_002dDependent.html#Sparc_002dDependent">Sparc-Dependent</a>: SPARC Dependent Features
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<li><a href="TIC54X_002dDependent.html#TIC54X_002dDependent">TIC54X-Dependent</a>: TI TMS320C54x Dependent Features
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<li><a href="V850_002dDependent.html#V850_002dDependent">V850-Dependent</a>: V850 Dependent Features
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<li><a href="Xtensa_002dDependent.html#Xtensa_002dDependent">Xtensa-Dependent</a>: Xtensa Dependent Features
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<li><a href="Z80_002dDependent.html#Z80_002dDependent">Z80-Dependent</a>: Z80 Dependent Features
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<li><a href="Z8000_002dDependent.html#Z8000_002dDependent">Z8000-Dependent</a>: Z8000 Dependent Features
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<li><a href="Vax_002dDependent.html#Vax_002dDependent">Vax-Dependent</a>: VAX Dependent Features
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</ul>
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<!-- The following major nodes are *sections* in the GENERIC version, *chapters* -->
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<!-- Copyright 2002, 2003 -->
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<!-- Free Software Foundation, Inc. -->
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