Enable AVX-VNNI 256-bit path for IQ3_XXS and IQ3_S R4 matmul#1474
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ikawrakow merged 1 commit intoikawrakow:mainfrom Mar 20, 2026
Merged
Enable AVX-VNNI 256-bit path for IQ3_XXS and IQ3_S R4 matmul#1474ikawrakow merged 1 commit intoikawrakow:mainfrom
ikawrakow merged 1 commit intoikawrakow:mainfrom
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Adding HAVE_VNNI256 optimized paths for
mul_mat_iq3_xxs_r4_q8_kandmul_mat_iq3_s_r4_q8_kkernels.The method we take here is very similar to some of my previous PRs, adding and conditionally using an optimized
dpbusdpath instead of the multi-instruction AVX2 alternative.FANCY is doing its own thing above the respective new VNNI code blocks and shouldn't reach this new code.
Performance
Sweep bench (Qwen3.5-2B IQ3_XS, 6 P-core threads,
--run-time-repack, N_KV 0-16384):Small but solid boost to pp and the data is suggestive of a tiny increase in tg as well
QA