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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 (/*AUTOARG*/
// Inputs
clk
);
input clk;
reg [7:0] cyc; initial cyc = 0;
reg [31:0] loops;
reg [31:0] loops2;
integer i;
always @ (posedge clk) begin
cyc <= cyc+8'd1;
if (cyc == 8'd1) begin
$write("[%0t] t_loop: Running\n", $time);
// Unwind <
loops = 0;
loops2 = 0;
for (i=0; i<16; i=i+1) begin
loops = loops + i; // surefire lint_off_line ASWEMB
loops2 = loops2 + i; // surefire lint_off_line ASWEMB
end
if (i !== 16) $stop;
if (loops !== 120) $stop;
if (loops2 !== 120) $stop;
// Unwind <=
loops = 0;
for (i=0; i<=16; i=i+1) begin
loops = loops + 1;
end
if (i !== 17) $stop;
if (loops !== 17) $stop;
// Don't unwind breaked loops
loops = 0;
for (i=0; i<16; i=i+1) begin
loops = loops + 1;
if (i==7) i=99; // break out of loop
end
if (loops !== 8) $stop;
// Don't unwind large loops!
loops = 0;
for (i=0; i<100000; i=i+1) begin
loops = loops + 1;
end
if (loops !== 100000) $stop;
// Test post-increment
loops = 0;
for (i=0; i<=16; i++) begin
loops = loops + 1;
end
if (i !== 17) $stop;
if (loops !== 17) $stop;
// Test pre-increment
loops = 0;
for (i=0; i<=16; ++i) begin
loops = loops + 1;
end
if (i !== 17) $stop;
if (loops !== 17) $stop;
// Test post-decrement
loops = 0;
for (i=16; i>=0; i--) begin
loops = loops + 1;
end
if (i !== -1) $stop;
if (loops !== 17) $stop;
// Test pre-decrement
loops = 0;
for (i=16; i>=0; --i) begin
loops = loops + 1;
end
if (i !== -1) $stop;
if (loops !== 17) $stop;
//
// 1800-2017 optionals init/expr/incr
loops = 0;
i = 0;
for (; i<10; ++i) ++loops;
if (loops !== 10) $stop;
//
loops = 0;
i = 0;
for (i=0; i<10; ) begin ++loops; ++i; end
if (loops !== 10) $stop;
//
loops = 0;
i = 0;
for (; ; ++i) begin ++loops; break; end
if (loops !== 1) $stop;
//
// bug1605
i = 1;
for (i=20; 0; ) ;
if (i != 20) $stop;
for (i=30; i<10; i++) ;
if (i != 30) $stop;
// Comma
loops = 0;
for (i=0; i<20; ++i, ++loops);
if (loops !== 20) $stop;
loops = 0;
for (i=0; i<20; ++loops, ++i);
if (loops !== 20) $stop;
//
$write("*-* All Finished *-*\n");
$finish;
end
end
endmodule
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