Re: [Iverilog-devel] Help: Seems like recursive function is not supported?

[Martin W. <ic...@ma...>]

Recursive functions have been supported for a long time. See

https://github.com/steveicarus/ivtest/blob/master/ivltests/recursive_func.v

Trying to compile the sha_mainloop.sv file from that GitHub project shows 
it is the always_comb construct that is causing the problem. Change it to 
an always @*, and the module compiles without error.

fuyong wrote:
> Hi,
> 
> We have download a design from Github. This design can run correctly in
> VCS. But iVeriog compile hang.
> 
> https://github.com/unixb0y/SystemVerilogSHA256
> 
> Guess it is the following function (recursive function as it call itself)
> cause the issue:
> 
>      function automatic [31:0] W;
>          input [6:0] x;
>          input [6:0] y;
>          if(^x === 1'bX) W = 32'h777;
>          else W = (x<16) ? padded[((PADDED_SIZE-1-y*512)-x*32) -: 32] :
> rho1(W(x-2, y)) + W(x-7, y) + rho0(W(x-15, y)) + W(x-16, y);
>      endfunction
> 
> Any suggestions on how to change the code for workaround? Or enhancement in
> iVerilog :-) ?
> 
> Thanks,
> Yong
> 
> 
> 
> 
> 
> _______________________________________________
> Iverilog-devel mailing list
> Ive...@li...
> https://lists.sourceforge.net/lists/listinfo/iverilog-devel
>