q4k mmq optimizations - #80
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Pipeline Q4_K tile loads with split WMMA dequantization and select the measured tile width by matrix shape. Assisted-by: GPT-5.6 Sol Co-authored-by: Cursor <cursoragent@cursor.com>
Match the refactored 32-row warp layout and limit the specialized J64 path to the small shape where it provides a stable gain. Assisted-by: GPT-5.6 Sol Co-authored-by: Cursor <cursoragent@cursor.com>
Use the generic vec-dot with J64 two-row waves and J128 one-row waves, retaining the J64 prefetch loop for the best measured shape coverage. Assisted-by: GPT-5.6 Sol Co-authored-by: Cursor <cursoragent@cursor.com>
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