OpenCL M1 CPU bugs

Question

Dear Apple OpenCL maintenance team,

I would like to share the following bugs I encountered with M1 CPU's OpenCL runtime.

erf function produce wrong results while I have to use 1 - erfc in the kernel to produce the correct results.
max_workitems_size is 1024x1x1 which make many existing kernels very inflexible to use since they normally use get_local_id(1) or even (2) to get flexible work-item indexing. Could you guys please modified it to 1024x1024x1024? The M1 GPU implementation has no such problem where the max_workgroup_size is 256 while max_workitems_size is 256x256x256. Besides, the Intel CPU runtime for Core i7-1165G7 ( driver = 2022.13.3.0.16_160000) has the max_workgroup_size 8192 while max_workitems_size = 8192x8192x8192.

Thank you very much!

Best wishes,

Jinchuan Tang

MacBook Air 13″, macOS 13.0

Posted on Dec 25, 2022 7:36 AM

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Answer 1

Top-ranking reply

Level 10

146,479 points

We’re not folks that work for Apple. We’re other users and other third-party developers.

AFAIK, OpenCL was deprecated at macOS 10.14: OpenCL for macOS - Apple Developer

More:

One of the alternatives to Metal directly can be Vulkan on Metal: https://moltengl.com/moltenvk/

As for your feedback, log a bug report with Apple: Bug Reporting - Apple Developer

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Answer 2

Dear Mr Hoffman,

thank you very much for your kind response.

As long as Apple is enabling OpenCL in the macOS, I will try to let them know the bug is there.

I am now trying to use feedback app to get in touch with them.

Best wishes,

Jinchuan Tang

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