Sjoerd Meijer 9bccf61f5f [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.

2024-11-20 09:33:39 +00:00

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