ocl: discover device properties once and simplified setting up WG-size

cp2k / dbcsr

DBCSR: Distributed Block Compressed Sparse Row matrix library

https://cp2k.github.io/dbcsr/

GNU General Public License v2.0

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Closed hfp closed 3 months ago

hfp commented 3 months ago

Store cl_device_id in c_dbcsr_acc_opencl_device_t and rely on it (instead of querying it repeatedly).
Make maximum size of work-group (WG) and preferred multiple available as part of device structure.
Discover subgroups. Avoid some compile-time decision (OpenCL 3.0).
Simplify handling WG-size (and SG-size).
Code cleanup (_DEBUG).