module LUT6 #(
`ifdef XIL_TIMING
  parameter LOC = "UNPLACED",
`endif
  parameter [63:0] INIT = 64'h0000000000000000
)(
  output O,

  input I0,
  input I1,
  input I2,
  input I3,
  input I4,
  input I5
);

// define constants
  localparam MODULE_NAME = "LUT6";

  reg trig_attr = 1'b0;
// include dynamic registers - XILINX test only
`ifdef XIL_DR
  `include "LUT6_dr.v"
`else
  reg [63:0] INIT_REG = INIT;
`endif

// begin behavioral model

  reg O_out;

  assign O = O_out;

  function lut_mux8_f;
  input [7:0] d;
  input [2:0] s;
  begin
    if (((s[2]^s[1]^s[0]) === 1'b1) || ((s[2]^s[1]^s[0]) === 1'b0))
      lut_mux8_f = d[s];
    else if ( ~(|d) || &d)
      lut_mux8_f = d[0];
    else if ((((s[1]^s[0]) === 1'b1) || ((s[1]^s[0]) === 1'b0)) &&
             (d[{1'b0,s[1:0]}] === d[{1'b1,s[1:0]}]))
      lut_mux8_f = d[{1'b0,s[1:0]}];
    else if ((((s[2]^s[0]) === 1'b1) || ((s[2]^s[0]) === 1'b0)) &&
             (d[{s[2],1'b0,s[0]}] === d[{s[2],1'b1,s[0]}]))
      lut_mux8_f = d[{s[2],1'b0,s[0]}];
    else if ((((s[2]^s[1]) === 1'b1) || ((s[2]^s[1]) === 1'b0)) &&
             (d[{s[2],s[1],1'b0}] === d[{s[2],s[1],1'b1}]))
      lut_mux8_f = d[{s[2:1],1'b0}];
    else if (((s[0] === 1'b1) || (s[0] === 1'b0)) &&
             (d[{1'b0,1'b0,s[0]}] === d[{1'b0,1'b1,s[0]}]) &&
             (d[{1'b0,1'b0,s[0]}] === d[{1'b1,1'b0,s[0]}]) &&
             (d[{1'b0,1'b0,s[0]}] === d[{1'b1,1'b1,s[0]}]))
      lut_mux8_f = d[{1'b0,1'b0,s[0]}];
    else if (((s[1] === 1'b1) || (s[1] === 1'b0)) &&
             (d[{1'b0,s[1],1'b0}] === d[{1'b0,s[1],1'b1}]) &&
             (d[{1'b0,s[1],1'b0}] === d[{1'b1,s[1],1'b0}]) &&
             (d[{1'b0,s[1],1'b0}] === d[{1'b1,s[1],1'b1}]))
      lut_mux8_f = d[{1'b0,s[1],1'b0}];
    else if (((s[2] === 1'b1) || (s[2] === 1'b0)) &&
             (d[{s[2],1'b0,1'b0}] === d[{s[2],1'b0,1'b1}]) &&
             (d[{s[2],1'b0,1'b0}] === d[{s[2],1'b1,1'b0}]) &&
             (d[{s[2],1'b0,1'b0}] === d[{s[2],1'b1,1'b1}]))
      lut_mux8_f = d[{s[2],1'b0,1'b0}];
    else
      lut_mux8_f = 1'bx;
  end
  endfunction

 always @(I0 or I1 or I2 or I3 or I4 or I5)  begin
   if ( (I0 ^ I1  ^ I2 ^ I3 ^ I4 ^ I5) === 1'b0 || (I0 ^ I1  ^ I2 ^ I3 ^ I4 ^ I5) === 1'b1)
     O_out = INIT_REG[{I5, I4, I3, I2, I1, I0}];
   else if ( ~(|INIT_REG) || &INIT_REG )
     O_out = INIT_REG[0];
   else
     O_out = lut_mux8_f ({lut_mux8_f (INIT_REG[63:56], {I2, I1, I0}),
                      lut_mux8_f (INIT_REG[55:48], {I2, I1, I0}),
                      lut_mux8_f (INIT_REG[47:40], {I2, I1, I0}),
                      lut_mux8_f (INIT_REG[39:32], {I2, I1, I0}),
                      lut_mux8_f (INIT_REG[31:24], {I2, I1, I0}),
                      lut_mux8_f (INIT_REG[23:16], {I2, I1, I0}),
                      lut_mux8_f ( INIT_REG[15:8], {I2, I1, I0}),
                      lut_mux8_f (  INIT_REG[7:0], {I2, I1, I0})}, {I5, I4, I3});
 end

// end behavioral model

`ifdef XIL_TIMING
  specify
	(I0 => O) = (0:0:0, 0:0:0);
	(I1 => O) = (0:0:0, 0:0:0);
	(I2 => O) = (0:0:0, 0:0:0);
	(I3 => O) = (0:0:0, 0:0:0);
	(I4 => O) = (0:0:0, 0:0:0);
	(I5 => O) = (0:0:0, 0:0:0);
	specparam PATHPULSE$ = 0;
  endspecify
`endif

endmodule