As the gap between memory and processor performance continues to widen, it becomes increasingly important to exploit cache memory effectively. Both hardware and software approaches can be explored to optimize cache performance. Hardware designers focus on cache organization issues, including replacement policy, associativity, block size and the resulting cache access time. Software writers use various optimization techniques, including software prefetching, data scheduling and code reordering. Our focus is on improving memory usage through code reordering compiler techniques. In this paper we present a link-time procedure mapping algorithm which can significantly improve the effectiveness of the instruction cache. Our algorithm produces an improved program layout by performing a color mapping of procedures to cache lines, taking into consideration the procedure size, cache size, cache line size, and call graph. We use cache line coloring to guide the procedure mapping, ind...