Control Flow
We have: beq, bne, what about Branch-if-less-than?
New instruction: if $s1 < $s2 then $t0 = 1 slt $t0, $s1, $s2 else $t0 = 0
Can use this instruction to build "blt $s1, $s2, Label" — can now build general control structures
Note that the assembler needs a register to do this, — there are policy of use conventions for registers