A 600-MHz superscalar floating-point processor

The floating-point unit of a 600-MHz, out-of-order, superscalar RISC Alpha microprocessor is described. The unit achieves 59 SpecFP95 and can transfer register data at up to 9.6 GB/s, It has two independent pipelines for mult iply and add/subtract operations, with iterative divide and square-root cir cuits, and is fabricated in a 2.2-V, 0.35-mu m CMOS process.