DPI declaration

SystemVerilog
1

how should I define system Verilog DPI function for this ?

//cpp function
void getdata(double* a, double* b, double* c, double* d,
const char* 1_file, const char* 2_file,
const char* 2_file, const char* 4_file)

where (double a[16779264], double b[49152],double c[50176], double d[576])

I am getting issues when I assign this huge arrays in system Verilog… any efficient way to do this ?

2

double in C corresponds to real in SystemVerilog.

   import "DPI-C" pure function void getdata
                           (input real a[16779264], 
                            output real b[49152], 
                            inout real c[50176], 
                            input real d[576]);

Would be the following in C

void
getdata(
    const double* a,
    double* b,
    double* c,
    const double* d);
3

Thanks Dave.

I did change double to real but my confusion was on size of array since its huge size should I put it in definition or use dynamic array and assign it afterwards ?

4

Changing the array declaration from fixed-sized to dynamically sized won’t change the size of the array you need. What issues are you facing?

See The XY Problem.