In recent years, the utilization wall has become a serious problem that prevents processor performance from increasing. GreenDroid, a heterogeneous architecture, has been proposed to attack the utilization wall in the mobile domain. Conservation cores (C-Cores) are exploited in GreenDroid, and a C-Core is produced from Android application source code by an automated compiler tool chain. This thesis examines the design of a new LLVM-based compiler tool chain for the GreenDroid architecture. It examines the choice of LLVM as the base compiler, provides an overview of the GreenDroid system, and discusses the design and implementation of the compiler tool chain. A C- Core generated from the Android Dalvik garbage collector is employed as a detailed case study

Magnetic structures with controlled domain wall pattern may be applied as potential building blocks for three-dimensional magnetic memory and logic devices. Using a unique electrochemical self-assembly method, we achieve regular single-crystalline cobalt filament arrays with specific geometric profile and crystallographic orientation, and the magnetic domain configuration can be conveniently tailored. We report the transition of periodic antiparallel magnetic domains to compressed vortex magnetic domains depending on the ratio of height to width of the wires. A "phase diagram" is obtained to describe the dependence of the type of magnetic domain and the geometrical profiles of the wires. Magnetoresistance of the filaments demonstrates that the contribution of a series of 180 domain walls is over 0.15% of the zero-field resistance ρ(H=0). These self-assembled magnetic nanofilaments, with controlled periodic domain patterns, offer an interesting platform to explore domain-wall-based memory and logic devices.