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OpenCL

glupescu
Adept I
‎03-23-2019 02:17 PM

OpenCL 64 bit atomics under Vega 8 Integrated Graphics on Win10 ?

I am working to compile an OpenCL program which needs 64bit atomics (atomic_xchg and atomic_add, with long datatype). I have added " #pragma OPENCL EXTENSION cl_khr_int64_base_atomics : enable" and the code works with no issue for NVIDIA GeForce GTX 750 Ti but does not compile for "gfx902" under "Advanced Micro Devices, Inc. OpenCL 2.1 AMD-APP (2686.5)".

I am compiling in Windows 10 64 bit, under cygwin, using SDK 3.0 AMD and driver 19.1.1 Radeon Settings Version
2019.0109.1906.34385 with driver OpenCL™ Version 25.20.15011.1004.

What could the problem be ? Are 64 bit atomics not implemented on Windows for this GPU ?

If that is the case, is it any better in Linux ? Last time I checked (March 2018) there wasn't even a driver for Linux. Windows looks very stable, so I would prefer to continue working in this environment - especially I made both NVIDIA and AMD GPU work together.

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1 Solution
dipak
Big Boss
‎04-01-2019 05:36 AM

For 64-bit values, try atom_<function> instead of atomic_<function> . For more, see https://www.khronos.org/registry/OpenCL/sdk/1.2/docs/man/xhtml/atomicFunctions.html

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2 Replies
dipak
Big Boss
‎04-01-2019 05:36 AM

For 64-bit values, try atom_<function> instead of atomic_<function> . For more, see https://www.khronos.org/registry/OpenCL/sdk/1.2/docs/man/xhtml/atomicFunctions.html

glupescu
In response to dipak
Adept I
‎04-03-2019 01:38 PM

Thanks, was a small confusion on my side that they worked for NV, but that was around the standard.

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