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## ZIP1, ZIP2 (vectors)

Interleave elements from two half vectors.

Interleave alternating elements from the lowest or highest halves of the first and second source vectors and place in elements of the destination vector. This instruction is unpredicated.

It has encodings from 2 classes: High halves and Low halves

### High halves

 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 0 0 0 0 0 1 0 1 size 1 Zm 0 1 1 0 0 1 Zn Zd

#### High halves

ZIP2 <Zd>.<T>, <Zn>.<T>, <Zm>.<T>

```if !HaveSVE() then UNDEFINED;
integer esize = 8 << UInt(size);
integer n = UInt(Zn);
integer m = UInt(Zm);
integer d = UInt(Zd);
integer part = 1;```

### Low halves

 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 0 0 0 0 0 1 0 1 size 1 Zm 0 1 1 0 0 0 Zn Zd

#### Low halves

ZIP1 <Zd>.<T>, <Zn>.<T>, <Zm>.<T>

```if !HaveSVE() then UNDEFINED;
integer esize = 8 << UInt(size);
integer n = UInt(Zn);
integer m = UInt(Zm);
integer d = UInt(Zd);
integer part = 0;```

### Assembler Symbols

 Is the name of the destination scalable vector register, encoded in the "Zd" field.
<T> Is the size specifier, encoded in size:
size <T>
00 B
01 H
10 S
11 D
 Is the name of the first source scalable vector register, encoded in the "Zn" field.
 Is the name of the second source scalable vector register, encoded in the "Zm" field.

### Operation

```CheckSVEEnabled();
integer pairs = VL DIV (esize * 2);
bits(VL) operand1 = Z[n];
bits(VL) operand2 = Z[m];
bits(VL) result;

integer base = part * pairs;
for p = 0 to pairs-1
Elem[result, 2*p+0, esize] = Elem[operand1, base+p, esize];
Elem[result, 2*p+1, esize] = Elem[operand2, base+p, esize];

Z[d] = result;```

### Operational information

If PSTATE.DIT is 1:

• The execution time of this instruction is independent of:
• The values of the data supplied in any of its registers.
• The values of the NZCV flags.
• The response of this instruction to asynchronous exceptions does not vary based on:
• The values of the data supplied in any of its registers.
• The values of the NZCV flags.