EXTENDED PRECISION ACCUMULATOR

摘要

PROBLEM TO BE SOLVED: To provide an extended precision accumulator for increasing the performance of arithmetic computation of an extended precision accumulator as the use of public-key cryptosystems increases. SOLUTION: A multiply unit includes an extended precision accumulator. Microprocessor instructions are provided for manipulating portions of the extended precision accumulator including an instruction to move the contents of a portion of the extended accumulator to a general-purpose register ("MFLHXU") and an instruction to move the contents of a general-purpose register to a portion of the extended accumulator ("MTLHX"). COPYRIGHT: (C)2010,JPO&INPIT