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); constant integer esize = 8 << UInt(size); constant integer n = UInt(Zn); constant integer m = UInt(Zm); constant integer d = 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 | |||||||||||
| op | |||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); if MaxImplementedSVL() < 256 then EndOfDecode(Decode_UNDEF); constant integer esize = 128; constant integer n = UInt(Zn); constant integer m = UInt(Zm); constant integer d = 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(); constant integer VL = CurrentVL; if VL < esize * 2 then EndOfDecode(Decode_UNDEF); constant integer pairs = VL DIV (esize * 2); bits(VL) result0; bits(VL) result1; for r = 0 to 1 constant integer base = r * pairs; constant bits(VL) operand = if r == 0 then Z[n, VL] else Z[m, VL]; for p = 0 to pairs-1 Elem[result0, base+p, esize] = Elem[operand, 2*p+0, esize]; Elem[result1, base+p, esize] = Elem[operand, 2*p+1, esize]; Z[d+0, VL] = result0; Z[d+1, VL] = result1;
This instruction is a data-independent-time instruction as described in About PSTATE.DIT.
Version 2025.09 — Copyright © 2010-2025 Arm Limited or its affiliates.
This site is provided as a community resource and is NOT affiliated with nor endorsed by Arm Limited.