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// DESCRIPTION: Verilator: Verilog Test module
//
// This file ONLY is placed under the Creative Commons Public Domain, for
// any use, without warranty, 2003 by Wilson Snyder.
// SPDX-License-Identifier: CC0-1.0
module t;
reg [2:0] value;
reg [31:0] rglobal;
reg [31:0] vec [1:0];
reg [31:0] n;
initial begin
rglobal = 1;
value = 2;
if (add(value) != 3'd3) $stop;
if (rglobal != 2) $stop;
if (add(add(3'd1)) != 3'd3) $stop;
if (rglobal != 4) $stop;
if (munge4(4'b0010) != 4'b1011) $stop;
if (toint(2) != 3) $stop;
if (rglobal != 5) $stop;
setit;
incr(rglobal,rglobal,32'h10);
if (rglobal != 32'h17) $stop;
nop(32'h11);
empty;
empty();
rglobal = 32'h00000001;
flipupperbit(rglobal,4'd4);
flipupperbit(rglobal,4'd12);
if (rglobal !== 32'h10100001) $stop;
if (nil_func(32'h12,32'h12) != 32'h24) $stop;
nil_task(32'h012,32'h112,rglobal);
if (rglobal !== 32'h124) $stop;
vec[0] = 32'h333;
vec[1] = 32'habc;
incr(vec[1],vec[0],vec[1]);
if (vec[0] != 32'h333) $stop;
if (vec[1] != 32'hdef) $stop;
// verilator lint_off SELRANGE
incr(vec[2],vec[0],vec[2]); // Reading/Writing past end of vector!
// verilator lint_on SELRANGE
n=1;
nil();
if (n !== 10) $stop;
// Functions called as tasks
// verilator lint_off IGNOREDRETURN
rglobal = 32'h4;
if (inc_and_return(32'h2) != 32'h6) $stop;
if (rglobal !== 32'h6) $stop;
rglobal = 32'h6;
inc_and_return(32'h3);
if (rglobal !== 32'h9) $stop;
// verilator lint_on IGNOREDRETURN
$write("*-* All Finished *-*\n");
$finish;
end
function [2:0] add;
input [2:0] fromv;
begin
add = fromv + 3'd1;
begin : named
reg [31:0] flocal;
flocal = 1;
rglobal = rglobal + flocal;
end : named // SystemVerilog end labels
end
endfunction
function [3:0] munge4;
input [3:0] fromv; // Different fromv than the 'fromv' signal above
reg one;
begin : named
reg [1:0] flocal;
// Function calling a function
one = 1'b1;
munge4 = {one, add(fromv[2:0])};
end
endfunction
task setit;
reg [31:0] temp;
begin
temp = rglobal + 32'h1;
rglobal = temp + 32'h1;
end
endtask
task incr (
// Check a V2K style input/output list
output [31:0] z,
input [31:0] a, inc
);
z = a + inc;
endtask
task nop;
input [31:0] a;
begin
end
endtask
task empty;
endtask
task flipupperbit;
inout [31:0] vector;
input [3:0] bitnum;
reg [4:0] bitnum2;
begin
bitnum2 = {1'b1, bitnum}; // A little math to test constant propagation
vector[bitnum2] = vector[bitnum2] ^ 1'b1;
end
endtask
task nil_task;
input [31:0] a;
input [31:0] b;
output [31:0] q;
// verilator no_inline_task
q = nil_func(a, b);
endtask
function void nil;
n = 10;
endfunction
function [31:0] nil_func;
input [31:0] fa;
input [31:0] fb;
// verilator no_inline_task
nil_func = fa + fb;
endfunction
function integer toint;
input integer fa;
toint = fa + 32'h1;
endfunction
function [31:0] inc_and_return;
input [31:0] inc;
rglobal = rglobal + inc;
return rglobal;
endfunction
endmodule
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