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lang-c
-fstrict-aliasing -fno-omit-frame-pointer -O3 -march=native --fast-math. The results from the image are from the whole code but this smaller example shows the same tendency. Anyway, @ViktorEijkhout's suggestion was correct and removed the big drop in performance.is_aliveaccesses incount_alive_neighbours_multiand the write performed with the result ofUPDATE_CELL.