GPU Data-tiled multi-mma: subgroup dimensions should be outer #19521
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This was already the idea, but there was an accidental exception: in the accumulator tensor, if there was both a
unroll_m
dimension andsubgroup_n
dimension, then thesubgroup_n
dimension wasn't on the outside ofunroll_m
as it was meant to be.Noticed this when it required corresponding strides in the ukernel.