PARALLEL FLOATING POINT ROUNDING METHOD AND OPERATION UNIT

摘要

PURPOSE: A parallel floating point rounding method and its operation unit is provided to process an addition and a rounding operation in a floating point addition unit by one step and eliminate a Sticky bit in a critical path so that it can reduce a time delay occurred at an alignment of exponential numbers and enhance a process speed of a floating point addition operation. CONSTITUTION: The method comprises steps of comparing exponent parts of a 1st operand and a 2nd operand input by a user, aligning a fractional part by a difference between the exponent parts, logically adding a Sticky bit to the fractional part, executing an addition and a subtraction operation, executing 4 mode rounding operation on the addition and the subtraction result, selectively outputting the rounded value, and normalizing the selectively output rounded value. The Sticky bit is generated in the addition/subtraction and the rounding process, and has no effect on the critical path.