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<title>Using as: Machine Dependencies</title>
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<a name="Machine-Dependencies"></a>
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<div class="header">
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<p>
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Next: <a href="Reporting-Bugs.html#Reporting-Bugs" accesskey="n" rel="next">Reporting Bugs</a>, Previous: <a href="Object-Attributes.html#Object-Attributes" accesskey="p" rel="prev">Object Attributes</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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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<hr>
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<a name="Machine-Dependent-Features"></a>
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<h2 class="chapter">9 Machine Dependent Features</h2>
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<a name="index-machine-dependencies"></a>
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<p>The machine instruction sets are (almost by definition) different on
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each machine where <code>as</code> runs. Floating point representations
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vary as well, and <code>as</code> 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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<code>as</code> support special pseudo-instructions for branch
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optimization.
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</p>
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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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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="AArch64_002dDependent.html#AArch64_002dDependent" accesskey="1">AArch64-Dependent</a>:</td><td> </td><td align="left" valign="top">AArch64 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Alpha_002dDependent.html#Alpha_002dDependent" accesskey="2">Alpha-Dependent</a>:</td><td> </td><td align="left" valign="top">Alpha Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ARC_002dDependent.html#ARC_002dDependent" accesskey="3">ARC-Dependent</a>:</td><td> </td><td align="left" valign="top">ARC Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ARM_002dDependent.html#ARM_002dDependent" accesskey="4">ARM-Dependent</a>:</td><td> </td><td align="left" valign="top">ARM Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="AVR_002dDependent.html#AVR_002dDependent" accesskey="5">AVR-Dependent</a>:</td><td> </td><td align="left" valign="top">AVR Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Blackfin_002dDependent.html#Blackfin_002dDependent" accesskey="6">Blackfin-Dependent</a>:</td><td> </td><td align="left" valign="top">Blackfin Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="CR16_002dDependent.html#CR16_002dDependent" accesskey="7">CR16-Dependent</a>:</td><td> </td><td align="left" valign="top">CR16 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="CRIS_002dDependent.html#CRIS_002dDependent" accesskey="8">CRIS-Dependent</a>:</td><td> </td><td align="left" valign="top">CRIS Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="D10V_002dDependent.html#D10V_002dDependent" accesskey="9">D10V-Dependent</a>:</td><td> </td><td align="left" valign="top">D10V Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="D30V_002dDependent.html#D30V_002dDependent">D30V-Dependent</a>:</td><td> </td><td align="left" valign="top">D30V Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Epiphany_002dDependent.html#Epiphany_002dDependent">Epiphany-Dependent</a>:</td><td> </td><td align="left" valign="top">EPIPHANY Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="H8_002f300_002dDependent.html#H8_002f300_002dDependent">H8/300-Dependent</a>:</td><td> </td><td align="left" valign="top">Renesas H8/300 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="HPPA_002dDependent.html#HPPA_002dDependent">HPPA-Dependent</a>:</td><td> </td><td align="left" valign="top">HPPA Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="ESA_002f390_002dDependent.html#ESA_002f390_002dDependent">ESA/390-Dependent</a>:</td><td> </td><td align="left" valign="top">IBM ESA/390 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="i386_002dDependent.html#i386_002dDependent">i386-Dependent</a>:</td><td> </td><td align="left" valign="top">Intel 80386 and AMD x86-64 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="i860_002dDependent.html#i860_002dDependent">i860-Dependent</a>:</td><td> </td><td align="left" valign="top">Intel 80860 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="i960_002dDependent.html#i960_002dDependent">i960-Dependent</a>:</td><td> </td><td align="left" valign="top">Intel 80960 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="IA_002d64_002dDependent.html#IA_002d64_002dDependent">IA-64-Dependent</a>:</td><td> </td><td align="left" valign="top">Intel IA-64 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="IP2K_002dDependent.html#IP2K_002dDependent">IP2K-Dependent</a>:</td><td> </td><td align="left" valign="top">IP2K Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="LM32_002dDependent.html#LM32_002dDependent">LM32-Dependent</a>:</td><td> </td><td align="left" valign="top">LM32 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="M32C_002dDependent.html#M32C_002dDependent">M32C-Dependent</a>:</td><td> </td><td align="left" valign="top">M32C Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="M32R_002dDependent.html#M32R_002dDependent">M32R-Dependent</a>:</td><td> </td><td align="left" valign="top">M32R Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="M68K_002dDependent.html#M68K_002dDependent">M68K-Dependent</a>:</td><td> </td><td align="left" valign="top">M680x0 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="M68HC11_002dDependent.html#M68HC11_002dDependent">M68HC11-Dependent</a>:</td><td> </td><td align="left" valign="top">M68HC11 and 68HC12 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Meta_002dDependent.html#Meta_002dDependent">Meta-Dependent </a>:</td><td> </td><td align="left" valign="top">Meta Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="MicroBlaze_002dDependent.html#MicroBlaze_002dDependent">MicroBlaze-Dependent</a>:</td><td> </td><td align="left" valign="top">MICROBLAZE Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="MIPS_002dDependent.html#MIPS_002dDependent">MIPS-Dependent</a>:</td><td> </td><td align="left" valign="top">MIPS Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="MMIX_002dDependent.html#MMIX_002dDependent">MMIX-Dependent</a>:</td><td> </td><td align="left" valign="top">MMIX Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="MSP430_002dDependent.html#MSP430_002dDependent">MSP430-Dependent</a>:</td><td> </td><td align="left" valign="top">MSP430 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="NDS32_002dDependent.html#NDS32_002dDependent">NDS32-Dependent</a>:</td><td> </td><td align="left" valign="top">Andes NDS32 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="NiosII_002dDependent.html#NiosII_002dDependent">NiosII-Dependent</a>:</td><td> </td><td align="left" valign="top">Altera Nios II Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="NS32K_002dDependent.html#NS32K_002dDependent">NS32K-Dependent</a>:</td><td> </td><td align="left" valign="top">NS32K Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="PDP_002d11_002dDependent.html#PDP_002d11_002dDependent">PDP-11-Dependent</a>:</td><td> </td><td align="left" valign="top">PDP-11 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="PJ_002dDependent.html#PJ_002dDependent">PJ-Dependent</a>:</td><td> </td><td align="left" valign="top">picoJava Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="PPC_002dDependent.html#PPC_002dDependent">PPC-Dependent</a>:</td><td> </td><td align="left" valign="top">PowerPC Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="RL78_002dDependent.html#RL78_002dDependent">RL78-Dependent</a>:</td><td> </td><td align="left" valign="top">RL78 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="RX_002dDependent.html#RX_002dDependent">RX-Dependent</a>:</td><td> </td><td align="left" valign="top">RX Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="S_002f390_002dDependent.html#S_002f390_002dDependent">S/390-Dependent</a>:</td><td> </td><td align="left" valign="top">IBM S/390 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="SCORE_002dDependent.html#SCORE_002dDependent">SCORE-Dependent</a>:</td><td> </td><td align="left" valign="top">SCORE Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="SH_002dDependent.html#SH_002dDependent">SH-Dependent</a>:</td><td> </td><td align="left" valign="top">Renesas / SuperH SH Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="SH64_002dDependent.html#SH64_002dDependent">SH64-Dependent</a>:</td><td> </td><td align="left" valign="top">SuperH SH64 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Sparc_002dDependent.html#Sparc_002dDependent">Sparc-Dependent</a>:</td><td> </td><td align="left" valign="top">SPARC Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="TIC54X_002dDependent.html#TIC54X_002dDependent">TIC54X-Dependent</a>:</td><td> </td><td align="left" valign="top">TI TMS320C54x Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="TIC6X_002dDependent.html#TIC6X_002dDependent">TIC6X-Dependent </a>:</td><td> </td><td align="left" valign="top">TI TMS320C6x Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="TILE_002dGx_002dDependent.html#TILE_002dGx_002dDependent">TILE-Gx-Dependent </a>:</td><td> </td><td align="left" valign="top">Tilera TILE-Gx Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="TILEPro_002dDependent.html#TILEPro_002dDependent">TILEPro-Dependent </a>:</td><td> </td><td align="left" valign="top">Tilera TILEPro Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="V850_002dDependent.html#V850_002dDependent">V850-Dependent</a>:</td><td> </td><td align="left" valign="top">V850 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Vax_002dDependent.html#Vax_002dDependent">Vax-Dependent</a>:</td><td> </td><td align="left" valign="top">VAX Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Visium_002dDependent.html#Visium_002dDependent">Visium-Dependent</a>:</td><td> </td><td align="left" valign="top">Visium Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="XGATE_002dDependent.html#XGATE_002dDependent">XGATE-Dependent</a>:</td><td> </td><td align="left" valign="top">XGATE Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="XSTORMY16_002dDependent.html#XSTORMY16_002dDependent">XSTORMY16-Dependent</a>:</td><td> </td><td align="left" valign="top">XStormy16 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Xtensa_002dDependent.html#Xtensa_002dDependent">Xtensa-Dependent</a>:</td><td> </td><td align="left" valign="top">Xtensa Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Z80_002dDependent.html#Z80_002dDependent">Z80-Dependent</a>:</td><td> </td><td align="left" valign="top">Z80 Dependent Features
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Z8000_002dDependent.html#Z8000_002dDependent">Z8000-Dependent</a>:</td><td> </td><td align="left" valign="top">Z8000 Dependent Features
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</td></tr>
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</table>
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<div class="header">
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<p>
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Next: <a href="Reporting-Bugs.html#Reporting-Bugs" accesskey="n" rel="next">Reporting Bugs</a>, Previous: <a href="Object-Attributes.html#Object-Attributes" accesskey="p" rel="prev">Object Attributes</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</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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