Faster Scalar Processors Superpipelining Means more stages in the pipeline. Lowers cycle time. More stalls. Superscalar Multiple instructions can enter the pipeline and advance to each stage. Lowers CPI (potentially < 1). Todays superscalar machines try to issue two to six instructions. More stalls. Dynamic Scheduling Allows instructions to be executed out of order when instructions that entered the pipeline first are stalled or take longer. Requires extra hardware resources. Often increases cycle time.

Chapter 6: Enhancing Performance with Pipelining - 72 of 88