48 lines
778 B
Coq
48 lines
778 B
Coq
|
module signed_assignment_bug();
|
||
|
|
|
||
|
|
reg [7:0] a;
|
||
|
|
wire [15:0] y;
|
||
|
|
wire [15:0] z;
|
||
|
|
|
||
|
|
initial begin
|
||
|
|
// Example vector
|
||
|
|
a = 8'b10110110;
|
||
|
|
|
||
|
|
// Wait for results to be calculated
|
||
|
|
#1;
|
||
|
|
|
||
|
|
// Display results
|
||
|
|
$display("a = %b", a);
|
||
|
|
$display("y = %b", y);
|
||
|
|
$display("z = %b", z);
|
||
|
|
|
||
|
|
// Finished
|
||
|
|
$finish(0);
|
||
|
|
end
|
||
|
|
|
||
|
|
// Calculate signed logical OR
|
||
|
|
manually_extended_assignment INST1(.a(a), .y(y));
|
||
|
|
signed_assignment INST2(.a(a), .y(z));
|
||
|
|
|
||
|
|
endmodule
|
||
|
|
|
||
|
|
module manually_extended_assignment(a, y);
|
||
|
|
|
||
|
|
input [7:0] a;
|
||
|
|
output [15:0] y;
|
||
|
|
|
||
|
|
// Manually sign extend before assignment
|
||
|
|
assign y = {{8{a[7]}}, a};
|
||
|
|
|
||
|
|
endmodule
|
||
|
|
|
||
|
|
module signed_assignment(a, y);
|
||
|
|
|
||
|
|
input [7:0] a;
|
||
|
|
output [15:0] y;
|
||
|
|
|
||
|
|
// $signed() sign extends before assignment
|
||
|
|
assign y = $signed(a);
|
||
|
|
|
||
|
|
endmodule
|