Combined addition/subtraction instruction with a flexible and dynamic source selection mechanism

摘要

The present invention relates to a method and system for providing a combined addition/subtraction instruction with a flexible and dynamic source selection mechanism. Specifically, a method can select a plurality of source operands from a plurality of operands, and set a polarity of each of the plurality of source operands to negative, if a value associated with the source operand is set to require negation of the source operand. The method also can add selected pairs of the plurality of source operands in predetermined orders to obtain a plurality of addition results and subtract the selected pairs of the plurality of source operands in the predetermined orders to obtain a plurality of subtraction results. The method further can output the plurality of addition results and the plurality of subtraction results.