Concatenate elements from two vectors
This instruction concatenates every second element from each of the first and second source vectors and places them in the corresponding elements of the two destination vectors.
This instruction is unpredicated.
It has encodings from 2 classes: 8-bit to 64-bit elements and 128-bit element
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | size | 1 | Zm | 1 | 1 | 0 | 1 | 0 | 0 | Zn | Zd | 1 | ||||||||||||
| op | |||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 8 << UInt(size); let n : integer = UInt(Zn); let m : integer = UInt(Zm); let d : integer = UInt(Zd::'0');
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 1 | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 1 | Zm | 1 | 1 | 0 | 1 | 0 | 1 | Zn | Zd | 1 | |||||||||||
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if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); end; if MaxImplementedSVL() < 256 then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 128; let n : integer = UInt(Zn); let m : integer = UInt(Zm); let d : integer = UInt(Zd::'0');
| <Zd1> |
Is the name of the first scalable vector register of the destination multi-vector group, encoded as "Zd" times 2. |
| <T> |
Is the size specifier,
encoded in
|
| <Zd2> |
Is the name of the second scalable vector register of the destination multi-vector group, encoded as "Zd" times 2 plus 1. |
| <Zn> |
Is the name of the first source scalable vector register, encoded in the "Zn" field. |
| <Zm> |
Is the name of the second source scalable vector register, encoded in the "Zm" field. |
CheckStreamingSVEEnabled(); let VL : integer{} = CurrentVL(); if VL < esize * 2 then EndOfDecode(Decode_UNDEF); end; let pairs : integer = VL DIV (esize * 2); var result0 : bits(VL); var result1 : bits(VL); for r = 0 to 1 do let base : integer = r * pairs; let operand : bits(VL) = if r == 0 then Z{VL}(n) else Z{VL}(m); for p = 0 to pairs-1 do result0[(base+p)*:esize] = operand[(2*p+0)*:esize]; result1[(base+p)*:esize] = operand[(2*p+1)*:esize]; end; end; Z{VL}(d+0) = result0; Z{VL}(d+1) = result1;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
2026-03_rel 2026-03-26 20:48:11
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