# Pastebin 2rZSOBmP
module top(input [31:0] a, input [31:0] b, input [2:0] op, output reg [31:0] out);

always @(*)
	case(op)
		3'b000: out = a & b;
		3'b001: out = a | b;
		3'b010: out = a ^ b;
		3'b011: out = ~a;
		3'b100: out = a + b;
		3'b101: out = a - b;
		3'b110: out = -b;
		3'b111: out = a >> 1;
	endcase
endmodule