07 SVE · deinterleave
UZP1
Elements 0 and 2 of each source walk into the destination — even lanes only.
uzp1 z0.s, z1.s, z2.sTypes: z0.s, z1.s, z2.s — 32-bit float, 4 lanes each. Drawn at SVL = 128 bits; at SVL = 512 one uzp1 still fills a whole vector: 8 + 8 even elements.
z1.s
z2.s
z0.s
z0 ← evens of z1, then evens of z2
Ready. z0.s will be rebuilt from the even elements.
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Reading the picture
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Even and odd
uzp1 takes elements 0 and 2 of each source — the dimmed odd lanes never move. uzp2 takes 1 and 3 instead; together they split one interleaved stream into two.
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Why deinterleave
Stereo audio, colour planes, interleaved captures: memory often arrives interleaved, while SIMD wants contiguous lanes of one kind. uzp is that bridge — and zip1 interleaves back.
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No predicate here
uzp moves whole vectors, so there is no p0. Every element is data being shuffled, not work being masked — TBL and FMLAL are the other unpredicated instruction pages here.
This pass unpacks z1.s = {1, 9, 3, 8} and z2.s = {5, 7, 2, 6}.