Approaches to Trim OR1200

OR1200 Module Level Utilization:
1954 Slices, initial slice utilization for or1200_top


After removing CUST5 instruction from or1200_alu:
1873 slices, (1954-1873)/1873 = 4.32% area improvement.


After modifying "SHIFT and ROTATE" logic of or1200_alu:
1839 slices, (1954-1839)/1839 = 6.25% area improvement