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MLIR emitters: Vectorize column reductions.
Special thanks to github user lingzhi98 who experimented with this in openxla/xla#11018. I tried to make the logic as similar for vectorized and non-vectorized reductions as I could. The vectorized logic looks like this: - produce N reduced elements per thread, store the intermediate results in a vector V - loop over the N elements of V, writing each one to shmem - loop over N elements, reading them from shmem and writing the result to global memory PiperOrigin-RevId: 636130464
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