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<h4 class="section">Directives to override the ISA level</h4>



   <p><small>GNU</small> <code>as</code> supports an additional directive to change

the <small>MIPS</small> Instruction Set Architecture level on the fly: <code>.set

mips</code><var>n</var><code></code>.  <var>n</var> should be a number from 0 to 5, or 32 or 64. 

The values 1 to 5, 32, and 64 make the assembler accept instructions

for the corresponding <small>ISA</small> level, from that point on in the

assembly.  <code>.set mips</code><var>n</var><code></code> affects not only which instructions

are permitted, but also how certain macros are expanded.  <code>.set

mips0</code> restores the <small>ISA</small> 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 <small>R4000</small>

instructions while assembling in 32 bit mode.  Use this directive with

care!



   <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>Traditional <small>MIPS</small> assemblers do not support this directive.



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