The ability to represent , manipulate and optimize data movement between devices such as processors in a distributed memory machine, or between global memory and processors in a shared memory machine, is crucial in generating efficient code for such machines. In this paper we describe a methodology far representing and manipulating data movement explicitly in a compiler. Our methodology, called Explicit Data Placement (XDP), consists of extensions to the compiler's intermediate program

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... as well as run-time structures that allow certain operations to be performed efficiently. We also illustrate one of the unique features of the XDP methodology: the ability to manipulate the run-time transfer of data ownership between processors.