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module top;
assert property ($countbits(15'b011xxxxzzzzzzzz, '0 ) == 1);
assert property ($countbits(15'b011xxxxzzzzzzzz, '1 ) == 2);
assert property ($countbits(15'b011xxxxzzzzzzzz, 'x ) == 4);
assert property ($countbits(15'b011xxxxzzzzzzzz, 'z ) == 8);
assert property ($countbits(15'b011xxxxzzzzzzzz, '0, '1 ) == 3);
assert property ($countbits(15'b011xxxxzzzzzzzz, '1, '1, '0 ) == 3);
assert property ($countbits(15'b011xxxxzzzzzzzz, '0, 'x ) == 5);
assert property ($countbits(15'b011xxxxzzzzzzzz, '0, 'z ) == 9);
assert property ($countbits(15'bz1x10xzxzzxzzzz, '0, 'z ) == 9);
assert property ($countbits(15'b011xxxxzzzzzzzz, 'x, 'z ) == 12);
assert property ($countbits(15'b011xxxxzzzzzzzz, '1, 'z ) == 10);
assert property ($countbits(15'b011xxxxzzzzzzzz, '1, 'x, 'z ) == 14);
assert property ($countbits(15'b011xxxxzzzzzzzz, '1, 'x, 'z, '0) == 15);
assert property ($countbits(0, '0) == 32); // test integers
assert property ($countbits(0, '1) == 0);
assert property ($countbits(80'b0, '0) == 80); // test something bigger than integer
assert property ($countbits(80'bx0, 'x) == 79);
always_comb begin
logic one;
logic [1:0] two;
logic [3:0] four;
// Make sure that the width of the whole expression doesn't affect the width of the shift
// operations inside the function.
one = $countbits(3'b100, '1) & 1'b1;
two = $countbits(3'b111, '1) & 2'b11;
four = $countbits(3'b111, '1) & 4'b1111;
assert (one == 1);
assert (two == 3);
assert (four == 3);
end
assert property ($countones(8'h00) == 0);
assert property ($countones(8'hff) == 8);
assert property ($countones(8'ha5) == 4);
assert property ($countones(8'h13) == 3);
logic test1 = 1'b1;
logic [4:0] test5 = 5'b10101;
assert property ($countones(test1) == 1);
assert property ($countones(test5) == 3);
assert property ($isunknown(8'h00) == 0);
assert property ($isunknown(8'hff) == 0);
assert property ($isunknown(8'hx0) == 1);
assert property ($isunknown(8'h1z) == 1);
assert property ($isunknown(8'hxz) == 1);
assert property ($onehot(8'h00) == 0);
assert property ($onehot(8'hff) == 0);
assert property ($onehot(8'h01) == 1);
assert property ($onehot(8'h80) == 1);
assert property ($onehot(8'h81) == 0);
assert property ($onehot(8'h20) == 1);
assert property ($onehot0(8'h00) == 1);
assert property ($onehot0(8'hff) == 0);
assert property ($onehot0(8'h01) == 1);
assert property ($onehot0(8'h80) == 1);
assert property ($onehot0(8'h81) == 0);
assert property ($onehot0(8'h20) == 1);
endmodule
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