iverilog/ivtest/ivltests/gate_connect1.v

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// Test behaviour when a multi-bit expression is used as the input of
// a single instance of a primitive gate. The standard is quiet about
// this, but the consensus among other simulators is that the LSB of
// the expression is used.
module top;
reg [1:0] in;
wire [2:0] out;
buf buf1(out[0], 1);
buf buf2(out[1], 2'b01);
buf buf3(out[2], in[1:0]);
initial begin
in = 1;
#1 $display("out = %b", out);
if (out === 3'b111)
$display("PASSED");
else
$display("FAILED");
end
endmodule