  instr ulaFunc selB wrReg
0 add     000    0     1  
1 sub     001    0     1  
2 xor     010    0     1  
3 or      011    0     1  
4 and     100    0     1  
5 sll     101    0     1  
6 srl     110    0     1  
7 sra     111    0     1  
8 addi    000    1     1  
