BF16 im2col_gemm (sgemm) path: sgemm=true, winograd=false Triggered when prefer_sgemm=true (large matrix) or kernel=1x1 prefer_sgemm: num_input * num_output * k*k * dilation^2 * stride^2 * sizeof(bf16) * 2 > L2 or num_input > 16 || num_output > 16
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