b10777

sycl: reduce redundant work in Q4_K multi-column MMVQ (#27062)

• sycl: Q4_K Weight unpack optimization and reuse between destination Columns

• sycl: Q4_K small N (N=2..4) + two output rows by subgroup reuse of activation between two rows.

• sycl: gate Q4_K two-row reuse for small N=2

• sycl: Fix on magic number now uses Q4_K_MMVQ_ROW_PAIR_MIN_NROWS=6272 for it, added tests for coverage around Q4_K_MMVQ_ROW_PAIR_MIN_NROWS with perf support to test Q4_K MUL_MAT, applied the same reuse pattern to the activation as the weights.

Assisted-by: GPT-5.6 Sol

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Co-authored-by: RaulAbejonDelgado raul.abejon.delgado@gmail.com

Website:

• https://llama.app

Attestations:

• https://github.com/ggml-org/llama.cpp/attestations/44932757

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• macOS Apple Silicon (arm64, KleidiAI enabled) DISABLED
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