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			15 lines
		
	
	
	
		
			271 B
		
	
	
	
		
			Verilog
		
	
	
	
	
	
			
		
		
	
	
			15 lines
		
	
	
	
		
			271 B
		
	
	
	
		
			Verilog
		
	
	
	
	
	
module opt_share_test(
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  input [15:0]  a,
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  input [15:0]  b,
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  input [15:0]  c,
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  input [15:0]  d,
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  input         sel,
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  output [63:0] res,
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  );
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  reg [31: 0]   cat1 = {a+b, c+d};
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  reg [31: 0]   cat2 = {a-b, c-d};
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  assign res = {b, sel ? cat1 : cat2, a};
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endmodule
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