It is well known that embedded systems must be implemented efficiently. This requires the use of processors that are optimized for specific application areas. Such optimization necessitates a careful exploration of the design space, including a detailed examination of cost-performance trade-offs. To avoid time-consuming assembly language programming during the exploration of the design space, compilers are essential. To analyze the impact of various software or hardware configurations on performance, switchable compilers are needed that can generate code for numerous different potential hardware configurations. This book provides a comprehensive and up-to-date overview of the rapidly evolving field of switchable compilers for embedded systems. It describes a variety of important tools as well as applications of switchable compilers at different levels in the design process.