For years, processor makers consistently delivered increases in clock rates and instruction-level parallelism, so that single-threaded code executed faster on newer processors with no modification.

However, this technique also increases the register pressure while it takes advantage of the instruction-level parallelism, and the register spilling is an effective approach to solve this problem.

By analyzing factors impacting upon the embedded system performance, an embedded system design method based on thread ideas is used, performance is improved with instruction level parallelism.