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Commit 6b659a39 authored by Ben Cumming's avatar Ben Cumming Committed by Sam Yates
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Fix support for Keplar (K20 & K80) GPUs. (#470) 

Fixes issue #467 

* Add GPU synchronization points where required for Kepler to coordinate CPU access of managed memory.
* Use hand-rolled double precision atomic addition for Kelper targets.
* Replace `ARB_WITH_CUDA` build option with `ARB_GPU_MODEL` option that takes one of 'none', 'K20', 'K80' or 'P100', and set up source-code defines accoringly.
* Clean up of redundant compiler flags and defines no longer required now that the project uses separate compilation for CUDA sources.
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