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WebGPU has no support for tensor cores (or their Apple Silicon equivalents). Vulkan has an Nvidia extension for it, is there any way to make MoltenVK use simdgroup_matrix instructions in compute shaders?

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AFAIK, MoltenVK doesn't. Dawn (Google's C++ WebGPU implementation) does have some experimental support for it [0][1].

[0] https://issues.chromium.org/issues/348702031

[1] https://github.com/gpuweb/gpuweb/issues/4195

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