llama.cpp · b11979

sycl : vectorize reordered-layout dequantization stores (Q4_0, K-quants, IQ3, MXFP4) (#30976) * sycl : widen reordered q4_0 dequantization stores The reordered-layout Q4_0 conversion kernel processed one qs byte per work-item with two scalar stores, strided 16 elements apart. Give it the same treatment the Q8_0 kernel got in #30775: a flat sycl::range<1> launch with four qs bytes (8 outputs) per work-item inside one 32-element block and two vec stores. Same float math and rounding as the scalar kernel; output is bit-identical. The existing k % QK4_0 == 0 assert guarantees whole 32-element blocks, so the k/8 launch covers every row exactly. The now-unreferenced scalar reorder kernel is removed. Arc Pro B70, primed prefill (prefill after decode on a reorder-installed tensor): +6.4% to +7.3%