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This document describes RAPP version 0.7. See the project home-page at http://savannah.nongnu.org/projects/rapp/ for newer versions and updated information.
The RAPP library is divided into two distinct parts – the API layer and the Compute layer. The API layer handles argument validation and error handling, and then call the low-level functions in the Compute layer, where the actual processing takes place.
The Compute layer can implement a function in two versions, a generic version and a vector version. The vector version uses a platform-specific implementation of the Vector Abstraction Layer (VAL). This way it is possible to support a broad range of SIMD architectures with a minimal amount of development, maintenance and debugging work.
Implementations are parameterized by a few compile-time constants. The fastest implementations and parameters are selected automatically by a tuning process when the library is built. RAPP is tuned on the following platforms:
The following sections describe the contents of RAPP in more detail.