| 摘要 |
PROBLEM TO BE SOLVED: To perform fast multiplying and accumulating matching the IEEE 754-1985 standards by determining a rounded value needed to generate a final multiplying and accumulating result equivalent to individual multiplication instructions in which rounding is embedded and individual addition instructions in which following rounding is embedded. SOLUTION: The processor is equipped with a multiplier 120 which generates an unrounded multiplication result by multiplying two values by each other and further generates 1st data needed to determine rounding. Similarly, the processor is equipped with an adder which generates an unrounded multiplying and accumulating operation result by adding a specific value to the unrounded result and further generates 2nd data needed to determine rounding. The decision logic 150 uses the 1st and 2nd data to determine a rounding value needed to generate the final multiplying and accumulating operation result equivalent to the execution of individual multiplication instructions wherein rounding is incorporated and individual addition instructions wherein following rounding is incorporated. |
