Triton Ascend Case Reduction Amax Large

非reduce轴很小、reduce轴很大的归约优化:将reduce轴映射到多核(而非常规的非reduce轴),使用原子操作跨线程块归约,通过二次切分避免超UB,适用于极端shape比例(M<<N如16×262144)的归约场景

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