alu.v

module alu_slice (input wire [1:0] op, input wire i0, i1, cin, output wire o, cout);
   wire t_sumdiff, t_and, t_or, t_andor;
   addsub _i0 (op[0], i0, i1, cin, t_sumdiff, cout);
   and2 _i1 (i0, i1, t_and);
   or2 _i2 (i0, i1, t_or);
   mux2 _i3 (t_and, t_or, op[0], t_andor);
   mux2 _i4 (t_sumdiff, t_andor, op[1], o);
endmodule

module alu (input wire [1:0] op, input wire [15:0] i0, i1,
    output wire [15:0] o, output wire cout);
   wire	[14:0] c;
   alu_slice _i0 (op, i0[0], i1[0], op[0] , o[0], c[0]);
   alu_slice _i1 (op, i0[1], i1[1], c[0], o[1], c[1]);
   alu_slice _i2 (op, i0[2], i1[2], c[1], o[2], c[2]);
   alu_slice _i3 (op, i0[3], i1[3], c[2], o[3], c[3]);
   alu_slice _i4 (op, i0[4], i1[4], c[3], o[4], c[4]);
   alu_slice _i5 (op, i0[5], i1[5], c[4], o[5], c[5]);
   alu_slice _i6 (op, i0[6], i1[6], c[5], o[6], c[6]);
   alu_slice _i7 (op, i0[7], i1[7], c[6], o[7], c[7]);
   alu_slice _i8 (op, i0[8], i1[8], c[7], o[8], c[8]);
   alu_slice _i9 (op, i0[9], i1[9], c[8], o[9], c[9]);
   alu_slice _i10 (op, i0[10], i1[10], c[9] , o[10], c[10]);
   alu_slice _i11 (op, i0[11], i1[11], c[10], o[11], c[11]);
   alu_slice _i12 (op, i0[12], i1[12], c[11], o[12], c[12]);
   alu_slice _i13 (op, i0[13], i1[13], c[12], o[13], c[13]);
   alu_slice _i14 (op, i0[14], i1[14], c[13], o[14], c[14]);
   alu_slice _i15 (op, i0[15], i1[15], c[14], o[15], cout);
endmodule