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184 lines
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<a name="Machine-Dependencies"></a>
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<p>
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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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<h2 class="chapter">9 Machine Dependent Features</h2>
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<p><a name="index-machine-dependencies-521"></a>The machine instruction sets are (almost by definition) different on
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each machine where <samp><span class="command">as</span></samp> runs. Floating point representations
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vary as well, and <samp><span class="command">as</span></samp> 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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<samp><span class="command">as</span></samp> 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="AArch64_002dDependent.html#AArch64_002dDependent">AArch64-Dependent</a>: AArch64 Dependent Features
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<li><a accesskey="2" href="Alpha_002dDependent.html#Alpha_002dDependent">Alpha-Dependent</a>: Alpha Dependent Features
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<li><a accesskey="3" href="ARC_002dDependent.html#ARC_002dDependent">ARC-Dependent</a>: ARC Dependent Features
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<li><a accesskey="4" href="ARM_002dDependent.html#ARM_002dDependent">ARM-Dependent</a>: ARM Dependent Features
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<li><a accesskey="5" href="AVR_002dDependent.html#AVR_002dDependent">AVR-Dependent</a>: AVR Dependent Features
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<li><a accesskey="6" href="Blackfin_002dDependent.html#Blackfin_002dDependent">Blackfin-Dependent</a>: Blackfin Dependent Features
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<li><a accesskey="7" href="CR16_002dDependent.html#CR16_002dDependent">CR16-Dependent</a>: CR16 Dependent Features
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<li><a accesskey="8" href="CRIS_002dDependent.html#CRIS_002dDependent">CRIS-Dependent</a>: CRIS Dependent Features
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<li><a accesskey="9" href="D10V_002dDependent.html#D10V_002dDependent">D10V-Dependent</a>: D10V Dependent Features
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<li><a href="D30V_002dDependent.html#D30V_002dDependent">D30V-Dependent</a>: D30V Dependent Features
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<li><a href="Epiphany_002dDependent.html#Epiphany_002dDependent">Epiphany-Dependent</a>: EPIPHANY 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="LM32_002dDependent.html#LM32_002dDependent">LM32-Dependent</a>: LM32 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="Meta_002dDependent.html#Meta_002dDependent">Meta-Dependent </a>: Meta Dependent Features
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<li><a href="MicroBlaze_002dDependent.html#MicroBlaze_002dDependent">MicroBlaze-Dependent</a>: MICROBLAZE 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="NDS32_002dDependent.html#NDS32_002dDependent">NDS32-Dependent</a>: Andes NDS32 Dependent Features
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<li><a href="NiosII_002dDependent.html#NiosII_002dDependent">NiosII-Dependent</a>: Altera Nios II Dependent Features
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<li><a href="NS32K_002dDependent.html#NS32K_002dDependent">NS32K-Dependent</a>: NS32K 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="RL78_002dDependent.html#RL78_002dDependent">RL78-Dependent</a>: RL78 Dependent Features
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<li><a href="RX_002dDependent.html#RX_002dDependent">RX-Dependent</a>: RX Dependent Features
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<li><a href="S_002f390_002dDependent.html#S_002f390_002dDependent">S/390-Dependent</a>: IBM S/390 Dependent Features
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<li><a href="SCORE_002dDependent.html#SCORE_002dDependent">SCORE-Dependent</a>: SCORE 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="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="TIC6X_002dDependent.html#TIC6X_002dDependent">TIC6X-Dependent </a>: TI TMS320C6x Dependent Features
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<li><a href="TILE_002dGx_002dDependent.html#TILE_002dGx_002dDependent">TILE-Gx-Dependent </a>: Tilera TILE-Gx Dependent Features
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<li><a href="TILEPro_002dDependent.html#TILEPro_002dDependent">TILEPro-Dependent </a>: Tilera TILEPro 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="Vax_002dDependent.html#Vax_002dDependent">Vax-Dependent</a>: VAX Dependent Features
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<li><a href="Visium_002dDependent.html#Visium_002dDependent">Visium-Dependent</a>: Visium Dependent Features
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<li><a href="XGATE_002dDependent.html#XGATE_002dDependent">XGATE-Dependent</a>: XGATE Features
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<li><a href="XSTORMY16_002dDependent.html#XSTORMY16_002dDependent">XSTORMY16-Dependent</a>: XStormy16 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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</ul>
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<!-- The following major nodes are *sections* in the GENERIC version, *chapters* -->
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<!-- in single-cpu versions. This is mainly achieved by @lowersections. There is a -->
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