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 9.24.5 Directives to override the ISA level
 -------------------------------------------
 
 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, 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.  `.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
 MIPS3 instructions while assembling in 32 bit mode.  Use this directive
 with care!
 
    The `.set arch=CPU' 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
 `-march' command line option are also selectable by this directive.
 The original value is restored by `.set arch=default'.
 
    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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