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parameter size_exponent = 8,
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parameter size_exponent = 8,
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parameter pipeline = 0,
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parameter pipeline = 0,
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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 size_counter = 5, //log2(size_in_mantissa) + 1 = 5)
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parameter size_counter = 5, //log2(size_in_mantissa) + 1 = 5)
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parameter double_size_in_mantissa = size_in_mantissa + size_in_mantissa)
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parameter double_size_in_mantissa = size_in_mantissa + size_in_mantissa)
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( input [size_in_mantissa : 0] unnormalized_mantissa,
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( input [size_in_mantissa - 1 : 0] m_a_number,
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input [size_in_mantissa - 1 : 0] inter_rounding_bits,
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input [size_in_mantissa - 1 : 0] m_b_number,
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input eff_op,
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input [size_exponent : 0] exp_inter,
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input [size_exponent : 0] exp_inter,
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input [size_exponent - 1 : 0] exp_difference,
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output[size_out_mantissa- 1 : 0] resulted_m_o,
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output[size_out_mantissa- 1 : 0] resulted_m_o,
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output[size_exponent - 1 : 0] resulted_e_o);
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output[size_exponent - 1 : 0] resulted_e_o);
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wire [size_exponent- 1 : 0] adjust_mantissa;
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wire [size_exponent- 1 : 0] adjust_mantissa;
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wire [size_exponent- 1 : 0] unadjusted_exponent;
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wire [size_exponent- 1 : 0] unadjusted_exponent;
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wire [double_size_in_mantissa:0] normalized_mantissa;
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wire [double_size_in_mantissa:0] normalized_mantissa;
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wire [size_in_mantissa-1: 0] shifted_m_b;
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wire [size_in_mantissa+1: 0] adder_mantissa;
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wire [size_in_mantissa : 0] unnormalized_mantissa;
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wire [size_in_mantissa - 1 : 0] initial_rounding_bits, inter_rounding_bits;
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wire dummy_bit;
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wire dummy_bit;
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//shift m_b_number
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shifter #( .INPUT_SIZE(size_in_mantissa),
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.SHIFT_SIZE(size_exponent),
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.OUTPUT_SIZE(double_size_in_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_b_shifter_instance( .a(m_b_number),//mantissa
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.arith(1'b0),//logical shift
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.shft(exp_difference),
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.shifted_a({shifted_m_b, initial_rounding_bits}));
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//compute unnormalized_mantissa
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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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assign {unnormalized_mantissa, inter_rounding_bits} =
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(adder_mantissa[size_in_mantissa + 1])? ({~adder_mantissa[size_in_mantissa : 0], ~initial_rounding_bits}) :
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({adder_mantissa[size_in_mantissa : 0], initial_rounding_bits});
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assign adjust_mantissa = unnormalized_mantissa[size_in_mantissa]? 2'd0 :
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assign adjust_mantissa = unnormalized_mantissa[size_in_mantissa]? 2'd0 :
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unnormalized_mantissa[size_in_mantissa-1]? 2'd1 : 2'd2;
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unnormalized_mantissa[size_in_mantissa-1]? 2'd1 : 2'd2;
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//compute shifting over unnormalized_mantissa
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//compute shifting over unnormalized_mantissa
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