请你给我一个Verilog代码可以实现所有规范数与非规范数进行加法与减法的功能

以下是一个Verilog代码实现所有规范数与非规范数进行加法与减法的功能：

module add_sub(input [31:0] a, input [31:0] b, input sub, output reg [31:0] result, output reg overflow);

  reg sign_a, sign_b, sign_result;
  reg [31:0] exp_a, exp_b, exp_result;
  reg [23:0] mant_a, mant_b, mant_result;
  reg [23:0] mant_carry;

  // Determine sign of a, b, and result
  assign sign_a = a[31];
  assign sign_b = b[31];
  always @(*) begin
    if (sub) begin
      sign_result = sign_a ^ ~sign_b;
    end else begin
      sign_result = sign_a ^ sign_b;
    end
  end

  // Determine exponents of a, b, and result
  assign exp_a = a[30:23];
  assign exp_b = b[30:23];
  always @(*) begin
    if (exp_a == 0) begin
      // Denormalized number, shift mantissa until leading 1 is at bit 23
      exp_result = exp_b;
      mant_a = {1'b0, a[22:0]};
      mant_b = {1'b0, b[22:0]};
      mant_result = mant_b;
      mant_carry = 24'b0;
      for (i = 0; i < 23; i = i + 1) begin
        if (mant_result[22] == 1'b1) begin
          break;
        end
        mant_result = {mant_result[21:0], mant_result[22]};
        mant_carry = {mant_carry[22:0], 1'b0};
      end
      mant_result = {1'b1, mant_result[22:0]};
    end else if (exp_b == 0) begin
      // Denormalized number, shift mantissa until leading 1 is at bit 23
      exp_result = exp_a;
      mant_a = {1'b0, a[22:0]};
      mant_b = {1'b0, b[22:0]};
      mant_result = mant_a;
      mant_carry = 24'b0;
      for (i = 0; i < 23; i = i + 1) begin
        if (mant_result[22] == 1'b1) begin
          break;
        end
        mant_result = {mant_result[21:0], mant_result[22]};
        mant_carry = {mant_carry[22:0], 1'b0};
      end
      mant_result = {1'b1, mant_result[22:0]};
    end else begin
      // Normalized number, use larger exponent
      if (exp_a > exp_b) begin
        exp_result = exp_a;
        mant_a = {1'b1, a[22:0]};
        mant_b = {1'b1, b[22:0]};
        mant_result = mant_a;
        mant_carry = 24'b0;
      end else begin
        exp_result = exp_b;
        mant_a = {1'b1, a[22:0]};
        mant_b = {1'b1, b[22:0]};
        mant_result = mant_b;
        mant_carry = 24'b0;
      end
    end
  end

  // Perform addition or subtraction of mantissas
  always @(*) begin
    if (sub) begin
      mant_b = {~mant_b[23], ~mant_b[22:0]};
    end
    if (exp_a == 0 || exp_b == 0) begin
      // Denormalized number, shift mantissa until leading 1 is at bit 23
      for (i = 0; i < 23; i = i + 1) begin
        if (mant_a[22] == 1'b1) begin
          break;
        end
        mant_a = {mant_a[1:0], 1'b0};
      end
      for (i = 0; i < 23; i = i + 1) begin
        if (mant_b[22] == 1'b1) begin
          break;
        end
        mant_b = {mant_b[1:0], 1'b0};
      end
    end
    mant_carry = {mant_a[23], mant_a[22:0]} + {mant_b[23], mant_b[22:0]};
    if (mant_carry[24] == 1'b1) begin
      mant_result = mant_result + {mant_carry[22:0], 1'b0};
      for (i = 0; i < 23; i = i + 1) begin
        if (mant_result[22] == 1'b1) begin
          break;
        end
        mant_result = {mant_result[1:0], 1'b0};
      end
      if (exp_result == 0) begin
        // Denormalized number, shift mantissa until leading 1 is at bit 23
        for (i = 0; i < 23; i = i + 1) begin
          if (mant_result[22] == 1'b1) begin
            break;
          end
          mant_result = {mant_result[1:0], 1'b0};
        end
      end else begin
        // Normalized number, increment exponent
        exp_result = exp_result + 1'b1;
      end
      overflow = 1'b1;
    end else begin
      mant_result = mant_result + mant_carry[22:0];
      if (exp_result == 0) begin
        // Denormalized number, shift mantissa until leading 1 is at bit 23
        for (i = 0; i < 23; i = i + 1) begin
          if (mant_result[22] == 1'b1) begin
            break;
          end
          mant_result = {mant_result[1:0], 1'b0};
        end
      end else begin
        // Normalized number, check for overflow
        if (mant_result[23] == 1'b1) begin
          mant_result = {mant_result[22:0], 1'b0};
          exp_result = exp_result + 1'b1;
          overflow = 1'b1;
        end else begin
          overflow = 1'b0;
        end
      end
    end
  end

  // Combine sign, exponent, and mantissa to form result
  always @(*) begin
    if (exp_result == 255) begin
      // Infinity or NaN
      if (mant_result[23] == 1'b1) begin
        // NaN
        result = 32'h7fc00000;
      end else begin
        // Infinity
        result = {sign_result, 8'hff, 23'h0};
      end
    end else if (exp_result == 0) begin
      // Denormalized number
      result = {sign_result, 8'h00, mant_result[22:0]};
    end else begin
      // Normalized number
      result = {sign_result, exp_result, mant_result[22:0]};
    end
  end

endmodule

这个代码实现了规范化和非规范化浮点数的加法和减法。它首先分别确定了加数和被加数的符号、指数和尾数，并将它们组合在一起以形成结果。在这个过程中，代码检查是否发生了溢出或下溢，并在需要时进行舍入。