MULTIPLY ADD FUNCTIONAL UNIT CAPABLE OF EXECUTING SCALE, ROUND, GETEXP, ROUND, GETMANT, REDUCE, RANGE AND CLASS INSTRUCTIONS

摘要

A method is described that involves executing a first instruction with a functional unit. The first instruction is a multiply-add instruction. The method further includes executing a second instruction with the functional unit. The second instruction is a round instruction.

主权项

1. A processor, comprising:
a functional unit having exponent difference calculation logic, a multiplier and an adder to support a multiply-add instruction, said functional unit also having a rounder to support a round instruction that specifies how many binary places a mantissa value is to be rounded to, said exponent difference calculation logic having a shifter to support execution of said multiply-add instruction and said round instruction.