[AArch64][LV] Set MaxInterleaving to 4 for Neoverse V2 and V3 (#100385) Set the maximum interleaving factor to 4, aligning with the number of available SIMD pipelines. This increases the number of vector instructions in the vectorised loop body, enhancing performance during its execution. However, for very low iteration counts, the vectorised body might not execute at all, leaving only the epilogue loop to run. This issue affects e.g. cam4_r from SPEC FP, which experienced a performance regression. To address this, the patch reduces the minimum epilogue vectorisation factor from 16 to 8, enabling the epilogue to be vectorised and largely mitigating the regression.
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