[Codegen][Metal] Support metal warp-level primitive #15401
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This PR introduces the warp-level shuffle primitives used in Metal Shading Language, and uses them in the implementation of allreduce lowering. The introduced primitives are: * `simd_shuffle`, * `simd_shuffle_up`, * `simd_shuffle_down`. See section 6.9.2 of https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf for details. The correctness are validated by `test_allreduce_cuda` with the backend changed to Metal. Given we do not have Metal CI tests, the correctness is checked only locally. Given the Metal shuffle primitives do not support (or need) masking, the pass LowerThreadAllreduce is updated to support such backend which does not have masks. One unit test for metal is added to ensure that no mask is used.
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tqchen
approved these changes
Jul 26, 2023
echuraev
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Jul 26, 2023
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This PR introduces the warp-level shuffle primitives used in Metal Shading Language, and uses them in the implementation of allreduce lowering.
The introduced primitives are:
simd_shuffle,simd_shuffle_up,simd_shuffle_down.See section 6.9.2 of https://developer.apple.com/metal/Metal-Shading-Language-Specification.pdf for details.
The correctness are validated by
test_allreduce_cudawith the backend changed to Metal. Given we do not have Metal CI tests, the correctness is checked only locally.Given the Metal shuffle primitives do not support (or need) masking, the pass LowerThreadAllreduce is updated to support such backend which does not have masks. One unit test for metal is added to ensure that no mask is used.