By default, MIPS 16 instructions are automatically extended to 32 bits
when necessary. The directive .set noautoextend will turn this
off. When .set noautoextend is in effect, any 32 bit instruction
must be explicitly extended with the .e modifier (e.g.,
li.e $4,1000). The directive .set autoextend may be used
to once again automatically extend instructions when necessary.
This directive is only meaningful when in MIPS 16 mode. Traditional MIPS assemblers do not support this directive.