verilator/test_regress/t/t_func_while.v

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2018 Julien Margetts
// SPDX-License-Identifier: CC0-1.0

module t #(
    parameter SZ = 4096
) (
    input wire clk,
    output reg [tdw(SZ)-1:0] data
);

  // bug1330
  function integer clog2(input integer value);
    integer tmp;
    tmp = value - 1;
    clog2 = 0;
    for (clog2 = 0; (tmp > 0) && (clog2 < 32); clog2 = clog2 + 1) tmp = tmp >> 1;
  endfunction

  function integer tdw(input integer SZ);
    tdw = clog2(SZ);
  endfunction

  integer b;

  always @(posedge clk)
    for (b = 0; b < tdw(SZ); b = b + 1)
      if ((data[b] === 1'bx)) $display("WARNING: %1t Writing X's to tag RAM [%m]", $time);

endmodule