tests/opt/opt_share_cat.v

   1 module opt_share_test(
   2   input [15:0]  a,
   3   input [15:0]  b,
   4   input [15:0]  c,
   5   input [15:0]  d,
   6   input         sel,
   7   output [63:0] res,
   8   );
   9
  10   reg [31: 0]   cat1 = {a+b, c+d};
  11   reg [31: 0]   cat2 = {a-b, c-d};
  12
  13   assign res = {b, sel ? cat1 : cat2, a};
  14
  15 endmodule