[water] Add design doc for elements-per-thread handling #790
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This document analyzes how elements_per_thread (EPT) is used in wave_lang and proposes that Water use index.size instead of separate EPT attributes. TL;DR: - EPT is redundant for most ops (Read, Write, MMA, Reduce, Broadcast) since it's already encoded in index.size - Only Atomic and Scatter need special attributes (atomic_count, scatter_count) since they may process fewer elements than vector size - PropagateElementsPerThread pass can be simplified/removed Signed-off-by: tyb0807 <[email protected]>
Documents what code can be simplified if PropagateElementsPerThread pass is removed and type conversion happens during lowering instead. Signed-off-by: tyb0807 <[email protected]>
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This document analyzes how elements_per_thread (EPT) is used in PyWave and proposes that Water use index.size instead of separate EPT attributes.
TL;DR:
Please let me know if my understanding is not correct.