use 2x unroll for i16→u1 copying to utilize two-vector homMask
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@ -46,7 +46,7 @@ fn copy{X, R}(x: *void, r: *void, l:u64, xRaw: *void) : void = {
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def XU = ty_u{XV}
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def op{x} = (XU~~x) == XU~~XV**1
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def unr = max{8/bulk, 1}
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def unr = if (hasarch{'X86_64'} and width{X}==16) 2 else max{8/bulk, 1}
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def bulk2 = bulk*unr
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xi:ux = 0
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@forNZ (i to cdiv{l,bulk2}) {
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