embedded c/c++ code with verilog

[Jen]

I am trying to embedded a C subroutine to my verilog code. However, gcc command doesn't work in my student version of modelsim. Does anybody have similar experience and could provide any advice on the solution?

 

Besides, if I do the multiplication in C subroutine (fixed point), should I follow "booth recording" algorithm for the optimization of the C code as well?

 

Thanks in advance