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(as.info)MIPS ISA

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Directives to override the ISA level
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   GNU `as' supports an additional directive to change the MIPS
Instruction Set Architecture level on the fly: `.set mipsN'.  N 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 ISA level,
from that point on in the assembly.  `.set mipsN' affects not only
which instructions are permitted, but also how certain macros are
expanded.  `.set mips0' 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
R4000 instructions while assembling in 32 bit mode.  Use this directive
with care!

   The directive `.set mips16' puts the assembler into MIPS 16 mode, in
which it will assemble instructions for the MIPS 16 processor.  Use
`.set nomips16' to return to normal 32 bit mode.

   Traditional MIPS assemblers do not support this directive.