Batch executor: a nested count loop's rounds sweep their lanes and masks back only when fewer are left than the most a round has taken and one (fresh and new_mask keep the fewest left; nested rounds' marks given back to the rounds around), else once after the loop as the last round did; matmul 3.6% fewer instructions, 4.5% fewer cycles (a sweep a k-round); a walk's rounds and a spread walk's chunks still sweep each: so held, BFS's batches ran out of lanes and went back to the executor (36.9 ms, the answers the same), what their filters and selections take not told by a round's fewest left; seeds 1 2 3 5 23 (default and PURE_SELECT=all), the fixed sources (also sanitized), the unit tests and ASan's pass

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