Dynamically choosing a register

[bryce at kampjes.demon.co.uk]

Do you mean for the cond to be evaluated at compile time in the
following?

   (def store-to-register (reg val)
 	(cond (reg)
   	      ((number-that-means-eax) (store eax val)

If so you could just generate:
   (mov t1 eax)

Then the register allocator will try to allocate t1 in eax
and remove that move.

Bryce