verilator/test_regress/t/t_func_numones.v

52 lines
1017 B
Systemverilog

// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain.
// SPDX-FileCopyrightText: 2003 Wilson Snyder
// SPDX-License-Identifier: CC0-1.0
module t (
input clk
);
reg [31:0] r32;
wire [3:0] w4;
wire [4:0] w5;
assign w4 = NUMONES_8(r32[7:0]);
assign w5 = NUMONES_16(r32[15:0]);
function [3:0] NUMONES_8;
input [7:0] i8;
reg [7:0] i8;
begin
NUMONES_8 = 4'b1;
end
endfunction // NUMONES_8
function [4:0] NUMONES_16;
input [15:0] i16;
reg [15:0] i16;
begin
NUMONES_16 = (NUMONES_8(i16[7:0]) + NUMONES_8(i16[15:8]));
end
endfunction
integer cyc;
initial cyc = 1;
always @(posedge clk) begin
if (cyc != 0) begin
cyc <= cyc + 1;
if (cyc == 1) begin
r32 <= 32'h12345678;
end
if (cyc == 2) begin
if (w4 !== 1) $stop;
if (w5 !== 2) $stop;
$write("*-* All Finished *-*\n");
$finish;
end
end
end
endmodule