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Fortran 90D/HPF is a data parallel language with special directives to enable users to specify data alignment and distributions. The authors describe the design and implementation of a Fortran 90D/HPF compiler. Techniques for data and computation partitioning, communication detection and generation, and the run-time support for the compiler are discussed. Initial performance results for the compiler are presented. It is believed that the methodology to process data distribution, computation partitioning, communication system design and the overall compiler design can be used by the implementors of HPF compilers.