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 4. A value from 1
to 4 makes 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.
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