WCET-Aware Assembly Level Optimizations

The major shortcoming of source code optimizations is their lack of intrinsic knowledge about the underlying architecture. Hence, the development of transformations that exploit processor-specific features is limited or even infeasible at all. As a result, a maximal optimization potential can not be explored. In contrast, assembly level optimizations operate on a code representation that reflects the finally executed code. Thus, the compiler is fully aware of numerous critical details about the utilized resources during execution. In this chapter, novel WCET-aware assembly level optimizations are discussed. In detail, the optimizations WCET-aware procedure positioning and WCET-aware trace scheduling are presented.