RFC & patch: Rework MIPS command-line handling

[Paul Koning]

>>>>> "Maciej" == Maciej W Rozycki <macro@ds2.pg.gda.pl> writes:

 Maciej> Hmm, what is "o64"?

That's the (unofficial?) name for "like o32 but with 64 bit
registers".  In other words, argument passing as with o32, but
registers are 64 bits and long long data goes in one register rather
than in a register pair.  mips3 opcodes for 64-bit operations are
used. 

This is an important case for embedded systems, which often need the
performance benefits of 64 bit operations.  N32 would be a good answer
except that it hasn't been available in the past, while o64 has been.

       paul