Abstract. The increasing demand for wireless devices running mobile applications has renewed the interest on the research of high performance low power processors that can be programmed using very compact code. One way to achieve this goal is to design specialized processors with short instruction formats and shallow pipelines. Given that it enables such architectural features, indirect addressing is the most used addressing mode in embedded programs. This paper analyzes the problem of allocating address registers to array references in loops using auto-increment addressing mode. It leverages on previous work, which is based on a heuristic that merges address register live ranges. We prove, for the first time, that the merge operation is NP-hard in general, and show the existence of an optimal linear-time algorithm, based on dynamic programming, for a special case of the problem.

Keywords: Carboxylate ligands / EPR spectroscopy / EXAFS spectroscopy / Mössbauer spectroscopy / OxidationA series of 2,6-diacylpyridine ligand precursors 5a-d·HCl with different tether lengths between the carboxyl and pyridine moiety was prepared and converted into the correspondig trinuclear Fe 3 (µ 3 -O) complexes 8a-d and 10. Under slow precipitation conditions a tetranuclear complex 9 was isolated instead of 8a. Single-crystal X-ray diffraction analyses were performed on ligands 5a-d and complexes 9 and 10. Characterization by X-ray absorption spectroscopy (XAS) proved a trinuclear Fe 3 (µ 3 -O) core for complexes 8a-d. When complex 8a was submitted to Gif-type oxidations (O 2 , Zn, pyridine, HOAc), Mössbauer and nuclear inelastic scattering (NIS) suggested the formation of mononuclear species. The trinuclear ferric complex 10 has an isosceles molecular structure, which is manifested in the 57 Fe Mössbauer spectrum

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