In one sentence, if one writes circular shift like (a << b | a >> (64 - b)) where a is an 64-bit integer in compute shader, then they will get E_OUTOFMEMORY when creating compute pipeline state.

This repository contains a minimal example illustrating the problem. (the term “minimal” does not apply to DX12 boilerplates)

1. Open MSVC x64 Native Tools Command Prompt

2. Clone the repository and cd into it

3. Run make.cmd

   (optionally with a number 1/0 indicating if you want to create an NVIDIA device or not)

4. Then run main.exe, and an OOM error should show up for NVIDIA GPU.

This example works fine with the integrated GPU on my laptop, while OOM was returned when using my discrete GeForce GTX 1050Ti. And I confirmed with the stack trace that the error was generated in nvwgf2umx.dll, an NVIDIA driver module.

I guess there is something wrong in the driver who compiles a shader from DXBC to some GPU native format, especially for recognizing and optimizing the circular shift pattern.

Hope NVIDIA can get circular shift for uint64_t work.

I also posted this to NVIDIA Forum.