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// Revision:
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// Revision:
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// Revision 0.01 - File Created
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// Revision 0.01 - File Created
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// Additional Comments:
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// Additional Comments:
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//
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//
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//////////////////////////////////////////////////////////////////////////////////
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//////////////////////////////////////////////////////////////////////////////////
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module SinglePathFPAdder #( parameter size_mantissa = 24, //1.M
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module SinglePathFPAdder #( parameter size_mantissa = 24, //calculate the size containing the hiden bit 1.M
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parameter size_exponent = 8,
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parameter size_exponent = 8,
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parameter size_exception_field = 2,
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parameter size_exception_field = 2,
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parameter size_counter = 5, //log2(size_mantissa) + 1 = 5)
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parameter size_counter = 5, //log2(size_mantissa) + 1 = 5)
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parameter [size_exception_field - 1 : 0] zero = 0, //00
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parameter [size_exception_field - 1 : 0] zero = 0, //00
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parameter [size_exception_field - 1 : 0] normal_number= 1, //01
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parameter [size_exception_field - 1 : 0] normal_number= 1, //01
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parameter pipeline_pos = 0, // 8 bits
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parameter pipeline_pos = 0, // 8 bits
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parameter double_size_mantissa = size_mantissa + size_mantissa,
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parameter double_size_mantissa = size_mantissa + size_mantissa,
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parameter double_size_counter = size_counter + 1,
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parameter double_size_counter = size_counter + 1,
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parameter size = size_mantissa + size_exponent + size_exception_field)
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parameter size = size_mantissa + size_exponent + size_exception_field)
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(sub, a_number_i, b_number_i, resulted_number_o);
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( input sub,
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input [size - 1 : 0] a_number_i,
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input [size - 1 : 0] b_number_i,
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output[size - 1 : 0] resulted_number_o);
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input sub;
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input [size - 1 : 0] a_number_i;
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input [size - 1 : 0] b_number_i;
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output[size - 1 : 0] resulted_number_o;
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wire [size_exception_field - 1 : 0] sp_case_a_number, sp_case_b_number;
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wire [size_mantissa - 1 : 0] m_a_number, m_b_number;
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wire [size_mantissa - 1 : 0] m_a_number, m_b_number;
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wire [size_exponent - 1 : 0] e_a_number, e_b_number;
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wire [size_exponent - 1 : 0] e_a_number, e_b_number;
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wire s_a_number, s_b_number;
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wire s_a_number, s_b_number;
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wire [size_exception_field - 1 : 0] sp_case_a_number, sp_case_b_number;
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wire [size_exponent : 0] a_greater_exponent, b_greater_exponent;
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wire [size_exponent - 1 : 0] unadjusted_exponent;
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wire [size_exponent - 1 : 0] exp_difference;
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wire [size_exponent - 1 : 0] exp_difference;
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wire [size_exponent - 1 : 0] modify_exp_a, modify_exp_b;
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wire [size_exponent : 0] exp_inter;
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wire [double_size_mantissa - 1 : 0] shifted_m_a, shifted_m_b;
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wire [size_mantissa - 1 : 0] shifted_m_b;
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wire [size_mantissa - 1 : 0] initial_rounding_bits, inter_rounding_bits, final_rounding_bits;
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wire eff_op;
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wire eff_op;
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wire [double_size_mantissa : 0] unnormalized_mantissa;
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wire [size_counter - 1 : 0] lzs;
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wire [double_size_counter-1: 0] lzs;
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wire [size_mantissa + 1 : 0] adder_mantissa;
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wire [size_mantissa-1: 0] unrounded_mantissa;
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wire [size_mantissa + 1 : 0] rounded_mantissa;
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wire [size_mantissa : 0] unnormalized_mantissa, unrounded_mantissa;
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wire [size_exception_field - 1 : 0] resulted_exception_field;
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wire [size_mantissa-1: 0] resulted_mantissa;
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wire [size_mantissa-1: 0] resulted_mantissa;
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wire [size_exponent-1: 0] resulted_exponent;
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wire [size_exponent-1: 0] resulted_exponent;
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wire resulted_sign;
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wire resulted_sign;
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wire [size_exception_field - 1 : 0] resulted_exception_field;
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wire [size_mantissa + 1 : 0] dummy_bits;
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wire dummy_bit;
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wire zero_flag;
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assign m_a_number = {1'b1, a_number_i[size_mantissa - 2 :0]};
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assign m_b_number = {1'b1, b_number_i[size_mantissa - 2 :0]};
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assign e_a_number = a_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1];
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assign e_a_number = a_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1];
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assign e_b_number = b_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1];
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assign e_b_number = b_number_i[size_mantissa + size_exponent - 1 : size_mantissa - 1];
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assign s_a_number = a_number_i[size - size_exception_field - 1];
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assign s_a_number = a_number_i[size - size_exception_field - 1];
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assign s_b_number = b_number_i[size - size_exception_field - 1];
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assign s_b_number = b_number_i[size - size_exception_field - 1];
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assign sp_case_a_number = a_number_i[size - 1 : size - size_exception_field];
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assign sp_case_a_number = a_number_i[size - 1 : size - size_exception_field];
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assign sp_case_b_number = b_number_i[size - 1 : size - size_exception_field];
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assign sp_case_b_number = b_number_i[size - 1 : size - size_exception_field];
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//find the difference between exponents
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assign exp_difference = (e_a_number > e_b_number)? (e_a_number - e_b_number) : (e_b_number - e_a_number);
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assign {modify_exp_a, modify_exp_b} = (e_a_number > e_b_number)? {8'd0, exp_difference} : {exp_difference, 8'd0};
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//find the greater exponent
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assign a_greater_exponent = e_a_number - e_b_number;
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assign b_greater_exponent = e_b_number - e_a_number;
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//shift the right mantissa
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//find the difference between exponents
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shifter #( .INPUT_SIZE(size_mantissa),
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assign exp_difference = (a_greater_exponent[size_exponent])? b_greater_exponent[size_exponent - 1 : 0] : a_greater_exponent[size_exponent - 1 : 0];
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.SHIFT_SIZE(size_exponent),
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assign exp_inter = (b_greater_exponent[size_exponent])? {1'b0, e_a_number} : {1'b0, e_b_number};
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.OUTPUT_SIZE(double_size_mantissa),
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.DIRECTION(1'b0), //0=right, 1=left
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.PIPELINE(pipeline),
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.POSITION(pipeline_pos))
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m_a_shifter_instance( .a(m_a_number),//mantissa
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.arith(1'b0),//logical shift
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.shft(modify_exp_a),
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.shifted_a(shifted_m_a));
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//set shifter always on m_b_number
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assign {m_a_number, m_b_number} = (b_greater_exponent[size_exponent])?
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{{1'b1, a_number_i[size_mantissa - 2 :0]}, {1'b1, b_number_i[size_mantissa - 2 :0]}} :
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{{1'b1, b_number_i[size_mantissa - 2 :0]}, {1'b1, a_number_i[size_mantissa - 2 :0]}};
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//shift m_b_number
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shifter #( .INPUT_SIZE(size_mantissa),
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shifter #( .INPUT_SIZE(size_mantissa),
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.SHIFT_SIZE(size_exponent),
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.SHIFT_SIZE(size_exponent),
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.OUTPUT_SIZE(double_size_mantissa),
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.OUTPUT_SIZE(double_size_mantissa),
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.DIRECTION(1'b0), //0=right, 1=left
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.DIRECTION(1'b0), //0=right, 1=left
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.PIPELINE(pipeline),
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.PIPELINE(pipeline),
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.POSITION(pipeline_pos))
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.POSITION(pipeline_pos))
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m_b_shifter_instance( .a(m_b_number),//mantissa
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m_b_shifter_instance( .a(m_b_number),//mantissa
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.arith(1'b0),//logical shift
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.arith(1'b0),//logical shift
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.shft(modify_exp_b),
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.shft(exp_difference),
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.shifted_a(shifted_m_b));
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.shifted_a({shifted_m_b, initial_rounding_bits}));
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//istantiate effective_operation_component
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//istantiate effective_operation_component
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effective_op effective_op_instance( .a_sign(s_a_number), .b_sign(s_b_number), .sub(sub), .eff_op(eff_op));
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effective_op effective_op_instance( .a_sign(s_a_number), .b_sign(s_b_number), .sub(sub), .eff_op(eff_op));
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//compute unnormalized_mantissa
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//compute unnormalized_mantissa
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assign unnormalized_mantissa = (eff_op)? ((shifted_m_a > shifted_m_b)? (shifted_m_a - shifted_m_b) : (shifted_m_b - shifted_m_a)) :
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assign adder_mantissa = (eff_op)? ({1'b0, m_a_number} - {1'b0, shifted_m_b}) : ({1'b0, m_a_number} + {1'b0, shifted_m_b});
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shifted_m_a + shifted_m_b;
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assign {unnormalized_mantissa, inter_rounding_bits} =
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(adder_mantissa[size_mantissa + 1])? ({~adder_mantissa[size_mantissa : 0], ~initial_rounding_bits}) :
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({adder_mantissa[size_mantissa : 0], initial_rounding_bits});
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//compute leading_zeros over unnormalized mantissa
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//compute leading_zeros over unnormalized mantissa
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leading_zeros #( .SIZE_INT(double_size_mantissa + 1'b1), .SIZE_COUNTER(double_size_counter), .PIPELINE(pipeline))
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leading_zeros #( .SIZE_INT(size_mantissa + 1), .SIZE_COUNTER(size_counter), .PIPELINE(pipeline))
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leading_zeros_instance (.a(unnormalized_mantissa),
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leading_zeros_instance (.a(unnormalized_mantissa[size_mantissa : 0]),
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.ovf(1'b0),
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.ovf(unnormalized_mantissa[size_mantissa]),
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.lz(lzs));
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.lz(lzs));
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//compute shifting over unnormalized_mantissa
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//compute shifting over unnormalized_mantissa
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shifter #( .INPUT_SIZE(double_size_mantissa + 1'b1),
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shifter #( .INPUT_SIZE(double_size_mantissa + 1),
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.SHIFT_SIZE(double_size_counter),
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.SHIFT_SIZE(size_counter),
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.OUTPUT_SIZE(double_size_mantissa + 2'd2),
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.OUTPUT_SIZE(double_size_mantissa + 2),
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.DIRECTION(1'b1), //0=right, 1=left
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.DIRECTION(1'b1), //0=right, 1=left
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.PIPELINE(pipeline),
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.PIPELINE(pipeline),
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.POSITION(pipeline_pos))
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.POSITION(pipeline_pos))
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shifter_instance( .a(unnormalized_mantissa),//mantissa
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shifter_instance( .a({unnormalized_mantissa, inter_rounding_bits}),//mantissa
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.arith(1'b0),//logical shift
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.arith(1'b0),//logical shift
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.shft(lzs),
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.shft(lzs),
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.shifted_a({unrounded_mantissa, dummy_bits}));
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.shifted_a({unrounded_mantissa, final_rounding_bits, dummy_bit}));
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//
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//assign g = dummy_bits[size_mantissa + 1];
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//assign sticky = |(dummy_bits[size_mantissa : 0]);
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//assign round_dec = g & (unrounded_mantissa[0] | sticky);
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//instantiate rounding_component
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//instantiate rounding_component
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rounding #( .SIZE_MOST_S_MANTISSA(size_mantissa),
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rounding #( .SIZE_MOST_S_MANTISSA(size_mantissa + 2),
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.SIZE_LEAST_S_MANTISSA(size_mantissa + 2'd2))
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.SIZE_LEAST_S_MANTISSA(size_mantissa))
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rounding_instance( .unrounded_mantissa(unrounded_mantissa),
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rounding_instance( .unrounded_mantissa({1'b0, unrounded_mantissa}),
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.dummy_bits(dummy_bits),
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.dummy_bits(final_rounding_bits),
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.rounded_mantissa(resulted_mantissa));
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.rounded_mantissa(rounded_mantissa));
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//adjust exponent in case of overflow
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assign adjust_exponent = (rounded_mantissa[size_mantissa + 1])? 2'd2 : 2'd1;
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//compute resulted_exponent
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//compute resulted_exponent
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assign resulted_exponent = (e_a_number >= e_b_number)? (e_a_number - lzs + 1'b1) : (e_b_number - lzs + 1'b1);
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assign unadjusted_exponent = exp_inter - lzs;
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assign resulted_exponent = unadjusted_exponent + adjust_exponent;
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//compute resulted_sign
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assign resulted_mantissa = (rounded_mantissa[size_mantissa + 1])? (rounded_mantissa[size_mantissa + 1 : 2]) : (rounded_mantissa[size_mantissa : 1]);
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assign resulted_sign = (eff_op)? ((shifted_m_a > shifted_m_b)? s_a_number : ~s_a_number) : s_a_number;
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//compute exception_field
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//compute exception_field
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special_cases #( .size_exception_field(size_exception_field),
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special_cases #( .size_exception_field(size_exception_field),
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.zero(zero),
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.zero(zero),
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.normal_number(normal_number),
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.normal_number(normal_number),
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.NaN(NaN))
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.NaN(NaN))
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special_cases_instance( .sp_case_a_number(sp_case_a_number),
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special_cases_instance( .sp_case_a_number(sp_case_a_number),
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.sp_case_b_number(sp_case_b_number),
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.sp_case_b_number(sp_case_b_number),
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.sp_case_result_o(resulted_exception_field));
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.sp_case_result_o(resulted_exception_field));
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//generate final result
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//set zero_flag in case of equal numbers
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assign resulted_number_o = {resulted_exception_field, resulted_sign, resulted_exponent, resulted_mantissa[size_mantissa-2 : 0]};
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assign zero_flag = ~(|(resulted_mantissa));
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//compute resulted_sign
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assign resulted_sign = (eff_op)?
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(!a_greater_exponent[size_exponent]? (!b_greater_exponent[size_exponent]? ~adder_mantissa[size_mantissa+1] : s_a_number) : ~s_b_number) :
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s_a_number;
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assign resulted_number_o = (zero_flag)? {size{1'b0}} :
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{resulted_exception_field, resulted_sign, resulted_exponent, resulted_mantissa[size_mantissa - 2 : 0]};
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endmodule
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endmodule
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