A quad-issue out-of-order RISC CPU

A 64 b 4-way superscalar PA-RISC microprocessor system operating from 150-250 MHz combines full out-of-order execution with low-cycle time, to produce >360 specint and >550 specfp. Specialized latching and clock circuits and extensive use of dynamic logic enable high frequency operation. 3.8 M logic transistors are integrated on a 17.68/spl times/19.1 mm/sup 2/ die in 3.3 V 0.5 /spl mu/m CMOS.