Multiply-accumulate operation method and apparatus

A multiply-accumulate operation apparatus, comprising:

• a memory configured to store a control program for a multiply-accumulate operation;
• and
• a processor configured to execute the control program stored in the memory,
• wherein the processor is configured to perform control to calculate, by an exponent subtractor, a difference between a value, obtained by adding a first exponent and a second exponent using an exponent adder, and an exponent of a floating-point value to be added, perform control to calculate, by a mantissa multiplier, a value obtained by multiplying a first mantissa by a second mantissa, perform control to shift, by a mantissa shifter, at least one of the value, which is obtained by multiplying the first mantissa by the second mantissa, and a mantissa value of the floating point value to be added, by the difference, perform control to add, by a mantissa adder, a shifted first mantissa value and a shifted second mantissa value to each other, perform control to accumulate, by an accumulation register, a value within a preset bit value of a mantissa bitwidth in a result of an addition operation of the shifted first mantissa value and the shifted second mantissa value, perform control to determine, by an overflow counter, an overflow count based on an overflow value by which the result of the addition operation of the shifted first mantissa value and the shifted second mantissa value exceeds the preset bit value of the mantissa bitwidth, perform control to perform normalization and rounding based on the value accumulated in the accumulation register and the overflow count, and perform control to update, by an exponent updater, the exponent using a normalized and rounded value.