If you like to hack Accelerate, and especially if you like to contribute changes back, please fork
https://github.com/mchakravarty/accelerate
and send pull request with your changes. In your pull request, please describe the testing that you have performed.
In general, testing should involve both the interpreter and the CUDA backend (if you have got access to CUDA compatible hardware). A fairly comprehensive set of tests is available in the accelerate-examples directory. This directory contains its own Cabal-based build system. If you built Accelerate without the CUDA backend, you need to configure accelerate-examples with the additional option -f-cuda to disable testing of the CUDA backend.
If you are considering writing a new backend, you can do so in a separate, standalone package. The Accelerate frontend is entirely independent of any backend and package accelerate exports all the internals necessary to implement a backend. If you run into any problems, please contact Manuel M T Chakravarty chak@cse.unsw.edu.au.