I am trying to pass 2D real array to an SV function and return the same but I'm not able to execute this task successfully. Here is a simple reproducible code:
module Two_d_array_pass();
real x[2][2]='{'{1.0,2.0},'{3.0,4.0}};
real y[2][2]='{'{2.0,2.0},'{2.0,2.0}};
real z[2][2];
int i,j;
initial begin
foreach(x[i,j]) $display("x[%0d][%0d]=%0f",i,j,x[i][j]);
foreach(y[i,j]) $display("y[%0d][%0d]=%0f",i,j,y[i][j]);
z=mult(x,y);
end
function real mult(x,y);
real c[2][2];
int i,j;
foreach(c[i,j])
c[i][j]=x[i][j]*y[i][j];
return c;
endfunction
endmodule
and here is the error I get:
file: Two_d_array_pass.sv
c[i][j]=x[i][j]*y[i][j];
|
xmvlog: *E,DIMERR (Two_d_array_pass.sv,18|10): Bit-select or part-select dimensions do not match declaration.
c[i][j]=x[i][j]*y[i][j];
|
xmvlog: *E,DIMERR (Two_d_array_pass.sv,18|18): Bit-select or part-select dimensions do not match declaration.
Can anyone correct the code to achieve this task?
You need to change the arguments to be 2x2 dimensional as well.
function real mult(real x[2][2],y[2][2]);
But you also need to do it for the return type, but because of syntax limitations, unpacked array need a typedef for the return type.
typedef real real2x2[2][2];
function real2x2 mult(real x[2][2],y[2][2]);
Then you might as well use the typedef everywhere
module Two_d_array_pass();
typedef real real2x2[2][2];
real2x2 x='{'{1.0,2.0},'{3.0,4.0}};
real2x2 y='{'{2.0,2.0},'{2.0,2.0}};
real2x2 z;
initial begin
foreach(x[i,j]) $display("x[%0d][%0d]=%0f",i,j,x[i][j]);
foreach(y[i,j]) $display("y[%0d][%0d]=%0f",i,j,y[i][j]);
z=mult(x,y);
end
function real2x2 mult(real2x2 x,y);
foreach(x[i,j])
mult[i][j]=x[i][j]*y[i][j];
endfunction
endmodule
P.S. you do not declare the iterating variables i and j separately, they are implicit and local to the scope of the foreach statement. If you declare them separately, they become extra variables unused by the foreach loop.