module __float64__trunc(
  input wire [63:0] f,
  output wire [63:0] out
);
  function automatic priority_sel_1b_2way (input reg [1:0] sel, input reg case0, input reg case1, input reg default_value);
    begin
      casez (sel)
        2'b?1: begin
          priority_sel_1b_2way = case0;
        end
        2'b10: begin
          priority_sel_1b_2way = case1;
        end
        2'b00: begin
          priority_sel_1b_2way = default_value;
        end
        default: begin
          // Propagate X
          priority_sel_1b_2way = 1'dx;
        end
      endcase
    end
  endfunction
  wire [10:0] f_bexp__1;
  wire [51:0] f_fraction__1;
  wire [10:0] EXPR_MASK;
  wire [10:0] exp;
  wire or_521;
  wire eq_523;
  wire eq_524;
  wire [51:0] fractional_mask__2;
  wire or_535;
  wire nor_536;
  wire [51:0] sel_540;
  wire f_sign__1;
  wire [63:0] tuple_556;
  assign f_bexp__1 = f[62:52];
  assign f_fraction__1 = f[51:0];
  assign EXPR_MASK = 11'h7ff;
  assign exp = f_bexp__1 + 11'h401;
  assign or_521 = f_bexp__1[10] | (&f_bexp__1[9:0]);
  assign eq_523 = f_fraction__1 == 52'h0_0000_0000_0000;
  assign eq_524 = f_bexp__1 == EXPR_MASK;
  assign fractional_mask__2 = {{21{exp[10]}}, exp} >= 32'h0000_0034 ? 52'h0_0000_0000_0000 : 52'hf_ffff_ffff_ffff >> {{21{exp[10]}}, exp};
  assign or_535 = f_bexp__1 == 11'h000 & eq_523 | eq_524 & eq_523;
  assign nor_536 = ~(~eq_524 | eq_523);
  assign sel_540 = f_bexp__1 < 11'h433 ? ~(~f_fraction__1 | fractional_mask__2 | ~{52{or_521}}) : f_fraction__1;
  assign f_sign__1 = f[63:63];
  assign tuple_556 = {~(nor_536 | ~f_sign__1), f_bexp__1 & {11{or_521}}, {priority_sel_1b_2way({or_535, nor_536}, 1'h1, 1'h0, sel_540[51]), sel_540[50:0] & {51{~(or_535 | nor_536)}}}};
  assign out = tuple_556;
endmodule