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[CK Tile] Eight Waves pipeline GEMM ## Motivation Eight waves pipeline was added for ABQuant. The goal of this PR is to enable it also for GEMM ## Technical Details Summary: - Block: - Create block struct for GEMM using eight warps specific distribution encodings - Use this block struct in ABQuant for encodings - Pipeline: - Create impl pipeline for eight waves which can be used by GEMM and ABQuant as base (and for AQuant and BQuant in the future) - Create eight waves pipeline for GEMM (this can not be easily integrated in the existing async pipeline) - Pipeline policy: - Extract GEMM specific parts in the ABQuant policy to define GEMM policy (then ABQuant use it as base and add Quant specific methods) - Minor: naming was inconsistent between warp/wave, everything is now referred to as eight waves So overall we have: - block struct directly used by GEMM -> ABQuant derived struct to implement operator - Impl base pipeline with general implementation -> GEMM and ABQuant pipelines use it to avoid code duplication but still define their own pipelines - pipeline policy struct directly used by GEMM -> ABQuant derived policy struct for Quant specific parts ## Test Plan Added new tests for GEMM pipeline: `test_ck_tile_gemm_pipeline_comp_async_eight_waves` (only gfx950 supports it). Note: K padding test is disabled for this pipeline because it's not implemented yet ## Submission Checklist - [x] Look over the contributing guidelines at https://github.com/ROCm/ROCm/blob/develop/CONTRIBUTING.md#pull-requests.