MIPS long long using inline asm

[Ted Krovetz <krovetz@cs.ucdavis.edu>]

Hi,

I'm doing cryptographic research at UC Davis and have need for fast 
32-bit x 32-bit -> 64-bit multiplications. On intel using gcc's inline 
assembler I get this using 

#define XMUL(x, y) \
({ UINT64 __res; UINT32 __x = (x), __y = (y); \
  __asm__ ("mull %2" : "=A" (__res) : "a" (__x), "r" (__y)); \
  __res; })

where the output specifier "=A" (__res) tells the compiler to bind the 
long long variable __res to the two 32-bit registers EDX:EAX.

I want to do something similar on MIPS. How can I use gcc and inline 
assembly to bind a pair of 32-bit registers to a long long variable?

Thanks,
Ted Krovetz