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<title>Sparc-Opts - Using as</title>
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<link rel="up" href="Sparc_002dDependent.html#Sparc_002dDependent" title="Sparc-Dependent">
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<link rel="next" href="Sparc_002dAligned_002dData.html#Sparc_002dAligned_002dData" title="Sparc-Aligned-Data">
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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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Permission is granted to copy, distribute and/or modify this document
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or any later version published by the Free Software Foundation;
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<p>
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<a name="Sparc_002dOpts"></a>Next: <a rel="next" accesskey="n" href="Sparc_002dAligned_002dData.html#Sparc_002dAligned_002dData">Sparc-Aligned-Data</a>,
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Up: <a rel="up" accesskey="u" href="Sparc_002dDependent.html#Sparc_002dDependent">Sparc-Dependent</a>
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<hr><br>
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</div>
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<h4 class="subsection">9.30.1 Options</h4>
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<p><a name="index-options-for-SPARC-1493"></a><a name="index-SPARC-options-1494"></a><a name="index-architectures_002c-SPARC-1495"></a><a name="index-SPARC-architectures-1496"></a>The SPARC chip family includes several successive versions, using the same
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core instruction set, but including a few additional instructions at
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each version. There are exceptions to this however. For details on what
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instructions each variant supports, please see the chip's architecture
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reference manual.
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<p>By default, <code>as</code> assumes the core instruction set (SPARC
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v6), but “bumps” the architecture level as needed: it switches to
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successively higher architectures as it encounters instructions that
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only exist in the higher levels.
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<p>If not configured for SPARC v9 (<code>sparc64-*-*</code>) GAS will not bump
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past sparclite by default, an option must be passed to enable the
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v9 instructions.
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<p>GAS treats sparclite as being compatible with v8, unless an architecture
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is explicitly requested. SPARC v9 is always incompatible with sparclite.
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<!-- The order here is the same as the order of enum sparc_opcode_arch_val -->
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<!-- to give the user a sense of the order of the "bumping". -->
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<a name="index-_002dAv6-1497"></a>
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<a name="index-Av7-1498"></a>
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<a name="index-_002dAv8-1499"></a>
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<a name="index-_002dAsparclet-1500"></a>
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<a name="index-_002dAsparclite-1501"></a>
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<a name="index-_002dAv9-1502"></a>
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<a name="index-_002dAv9a-1503"></a>
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<dl><dt><code>-Av6 | -Av7 | -Av8 | -Asparclet | -Asparclite</code><dt><code>-Av8plus | -Av8plusa | -Av9 | -Av9a</code><dd>Use one of the <span class="samp">-A</span> options to select one of the SPARC
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architectures explicitly. If you select an architecture explicitly,
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<code>as</code> reports a fatal error if it encounters an instruction
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or feature requiring an incompatible or higher level.
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<p><span class="samp">-Av8plus</span> and <span class="samp">-Av8plusa</span> select a 32 bit environment.
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<p><span class="samp">-Av9</span> and <span class="samp">-Av9a</span> select a 64 bit environment and are not
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available unless GAS is explicitly configured with 64 bit environment
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support.
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<p><span class="samp">-Av8plusa</span> and <span class="samp">-Av9a</span> enable the SPARC V9 instruction set with
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UltraSPARC extensions.
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<br><dt><code>-xarch=v8plus | -xarch=v8plusa</code><dd>For compatibility with the SunOS v9 assembler. These options are
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equivalent to -Av8plus and -Av8plusa, respectively.
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<br><dt><code>-bump</code><dd>Warn whenever it is necessary to switch to another level.
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If an architecture level is explicitly requested, GAS will not issue
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warnings until that level is reached, and will then bump the level
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as required (except between incompatible levels).
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<br><dt><code>-32 | -64</code><dd>Select the word size, either 32 bits or 64 bits.
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These options are only available with the ELF object file format,
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and require that the necessary BFD support has been included.
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</dl>
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</body></html>
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