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XcalableMP is an extension to the OpenMP standard for accelerator computing. The programming language was designed by RIKEN AICS in Japan and the University of Tsukuba, based on XcalableACC. XcalableMP enhances productivity by allowing developers to construct parallel programs for accelerators, such as GPUs or FPGAs, without having to deal with low-level details of accelerator programming. It's especially useful in high-performance computing (HPC) environments where optimizing code for different types of accelerators can significantly improve overall application performance.