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Is There a Way to Access Global Data Share (GDS) on Ellesmere (RX 480)?

Question asked by meriken on Jan 4, 2017
Latest reply on Mar 14, 2017 by meriken

Is there a way to access the fast 64KB Global Data Share (GDS) on Ellesmere (RX 480), either in OpenCL or in the GCN assembly?

cl_ext_atomic_counters_32 has been deprecated, and I had no luck so far with CLRadeonExtender.


Update (1/4/2017 8:14 p.m. PST): It seems that you need the OpenCL 1.2 ABI to enable the GDS functionarity. You can still create OpenCL 1.2 binaries for Ellesmere with Crimson drivers with the "-legacy" build option, and I was able to run a program with the cl_ext_atomic_counters_32 extension and the counter32_t type by adding the "-Dcl_ext_atomic_counters_32" build option. CLRadeonExtender does not seem to be able to handle OpenCL 1.2 binaries for Ellesmere. Further testing is needed.