RISC

/prog/, I'm working on a RISC instruction set that is more RISC than any RISC out there. I've devised an instruction format, plus fifteen core instructions that should suffice for any programming out there. The instruction format, instruction forms, and instructions can be found here:

http://jsbin.com/ekuwap

Any comments or suggestions?

Logarithmic step rotations ?

for bits used as step// rot max

1 bit -> (Rot 0?? // nop?) & Rot 1
2 bit -> (Rot 2) & Rot 4
3rd bit -> (Rot 8) & Rot 16
...