floating point operations with and without Custom instruction floating point hardware

hi

Instead of adding verilog files for creating a floating point custom instruction hardware i added through SOPC Builder by clicking on cpu(in Sopc) and in Custom Instructions tab added floating point hardware

But System.h file is not showing any indication that floating point hardware is added unlike if i write any verilog code and add as custom instruction it indicates in System.h file

I tried adding the f at the end of a floating point value but i didnt see any performance change

I see one major difference in the logic utilization

Occupied (35%) of fpga when no floating point hardware is added

and when floating point hardware is added it occupied 53% of FPGA

But performance is coming the same

regards

M Kalyansrinivas