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 <a name="MIPS-ISA"></a>
 <div class="header">
 <p>
 Next: <a href="MIPS-assembly-options.html#MIPS-assembly-options" accesskey="n" rel="next">MIPS assembly options</a>, Previous: <a href="MIPS-Small-Data.html#MIPS-Small-Data" accesskey="p" rel="prev">MIPS Small Data</a>, Up: <a href="MIPS_002dDependent.html#MIPS_002dDependent" accesskey="u" rel="up">MIPS-Dependent</a> &nbsp; [<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>
 <a name="Directives-to-override-the-ISA-level"></a>
 <h4 class="subsection">9.27.5 Directives to override the ISA level</h4>

 <a name="index-MIPS-ISA-override"></a>
 <a name="index-_002eset-mipsn"></a>
 <p><small>GNU</small> <code>as</code> supports an additional directive to change
 the MIPS Instruction Set Architecture level on the fly: <code>.set
 mips<var>n</var></code>.  <var>n</var> should be a number from 0 to 5, or 32, 32r2, 64
 or 64r2.
 The values other than 0 make the assembler accept instructions
 for the corresponding ISA level, from that point on in the
 assembly.  <code>.set mips<var>n</var></code> affects not only which instructions
 are permitted, but also how certain macros are expanded.  <code>.set
 mips0</code> restores the ISA level to its original level: either the
 level you selected with command line options, or the default for your
 configuration.  You can use this feature to permit specific MIPS III
 instructions while assembling in 32 bit mode.  Use this directive with
 care!
 </p>
 <a name="index-MIPS-CPU-override"></a>
 <a name="index-_002eset-arch_003dcpu"></a>
 <p>The <code>.set arch=<var>cpu</var></code> directive provides even finer control.
 It changes the effective CPU target and allows the assembler to use
 instructions specific to a particular CPU.  All CPUs supported by the
 &lsquo;<samp>-march</samp>&rsquo; command line option are also selectable by this directive.
 The original value is restored by <code>.set arch=default</code>.
 </p>
 <p>The directive <code>.set mips16</code> puts the assembler into MIPS 16 mode,
 in which it will assemble instructions for the MIPS 16 processor.  Use
 <code>.set nomips16</code> to return to normal 32 bit mode.
 </p>
 <p>Traditional MIPS assemblers do not support this directive.
 </p>
 <p>The directive <code>.set micromips</code> puts the assembler into microMIPS mode,
 in which it will assemble instructions for the microMIPS processor.  Use
 <code>.set nomicromips</code> to return to normal 32 bit mode.
 </p>
 <p>Traditional MIPS assemblers do not support this directive.
 </p>
 <hr>
 <div class="header">
 <p>
 Next: <a href="MIPS-assembly-options.html#MIPS-assembly-options" accesskey="n" rel="next">MIPS assembly options</a>, Previous: <a href="MIPS-Small-Data.html#MIPS-Small-Data" accesskey="p" rel="prev">MIPS Small Data</a>, Up: <a href="MIPS_002dDependent.html#MIPS_002dDependent" accesskey="u" rel="up">MIPS-Dependent</a> &nbsp; [<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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	<a name="MIPS-ISA"></a>
	<div class="header">
	<p>
	Next: <a href="MIPS-assembly-options.html#MIPS-assembly-options" accesskey="n" rel="next">MIPS assembly options</a>, Previous: <a href="MIPS-Small-Data.html#MIPS-Small-Data" accesskey="p" rel="prev">MIPS Small Data</a>, Up: <a href="MIPS_002dDependent.html#MIPS_002dDependent" accesskey="u" rel="up">MIPS-Dependent</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>
	</div>
	<hr>
	<a name="Directives-to-override-the-ISA-level"></a>
	<h4 class="subsection">9.27.5 Directives to override the ISA level</h4>

	<a name="index-MIPS-ISA-override"></a>
	<a name="index-_002eset-mipsn"></a>
	<p><small>GNU</small> <code>as</code> supports an additional directive to change
	the MIPS Instruction Set Architecture level on the fly: <code>.set
	mips<var>n</var></code>. <var>n</var> should be a number from 0 to 5, or 32, 32r2, 64
	or 64r2.
	The values other than 0 make the assembler accept instructions
	for the corresponding ISA level, from that point on in the
	assembly. <code>.set mips<var>n</var></code> affects not only which instructions
	are permitted, but also how certain macros are expanded. <code>.set
	mips0</code> restores the ISA level to its original level: either the
	level you selected with command line options, or the default for your
	configuration. You can use this feature to permit specific MIPS III
	instructions while assembling in 32 bit mode. Use this directive with
	care!
	</p>
	<a name="index-MIPS-CPU-override"></a>
	<a name="index-_002eset-arch_003dcpu"></a>
	<p>The <code>.set arch=<var>cpu</var></code> directive provides even finer control.
	It changes the effective CPU target and allows the assembler to use
	instructions specific to a particular CPU. All CPUs supported by the
	‘<samp>-march</samp>’ command line option are also selectable by this directive.
	The original value is restored by <code>.set arch=default</code>.
	</p>
	<p>The directive <code>.set mips16</code> puts the assembler into MIPS 16 mode,
	in which it will assemble instructions for the MIPS 16 processor. Use
	<code>.set nomips16</code> to return to normal 32 bit mode.
	</p>
	<p>Traditional MIPS assemblers do not support this directive.
	</p>
	<p>The directive <code>.set micromips</code> puts the assembler into microMIPS mode,
	in which it will assemble instructions for the microMIPS processor. Use
	<code>.set nomicromips</code> to return to normal 32 bit mode.
	</p>
	<p>Traditional MIPS assemblers do not support this directive.
	</p>
	<hr>
	<div class="header">
	<p>
	Next: <a href="MIPS-assembly-options.html#MIPS-assembly-options" accesskey="n" rel="next">MIPS assembly options</a>, Previous: <a href="MIPS-Small-Data.html#MIPS-Small-Data" accesskey="p" rel="prev">MIPS Small Data</a>, Up: <a href="MIPS_002dDependent.html#MIPS_002dDependent" accesskey="u" rel="up">MIPS-Dependent</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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