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* iq1_s_r4: basics - quantize/dequantize * iq1_s_r4: gemm/gemv works on AVX2/Zen4 * Don't forget to make sure we have a multiple of 4 rows per thread * iq1_s_r4: this is better * iq1_s_r4: fix Zen4 after AVX2 changes * iq1_s_r4: NEON gemm/gemv * iq1_s_r4: more bits for shared experts With this mix we arrive at PPL(512) = 9.4140 for Deepseek-Lite using 1.766 bpw for the repeating layers. On the Ryzen-7950X we get PP-512 = 494 t/s and TG-128 = 52 t/s @ 16 threads. * Forgotten counter increment * iq1_s_r4: slightly faster AVX2/Zen4 gemm/gemv * Compiler warnings --------- Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>