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OK, I'm clear on scalars. Data races are thankfully OK in this context. Densely packing vectors sounds efficient and is clear in the case where lanes * width is a multiple of 8 bits. I don't think I understand how it works in other cases. If we could take store <4 x i8> truncating to <4 x i7> as an example. This can be converted into four scalar i8 -> i7 stores with

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