ZIP (two registers)

Interleave elements from two vectors

This instruction places the two-way interleaved elements from the first and second source vectors in the corresponding elements of the two destination vectors.

This instruction is unpredicated.

Encoding: 8-bit to 64-bit elements

Variants: FEAT_SME2 (ARMv9.3)

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

ZIP { <Zd1>.<T>-<Zd2>.<T> }, <Zn>.<T>, <Zm>.<T>

Decoding algorithm

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');

Encoding: 128-bit element

Variants: FEAT_SME2 (ARMv9.3)

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						1	1	0	1	0	1										0
											Zm											Zn					Zd				op

ZIP { <Zd1>.Q-<Zd2>.Q }, <Zn>.Q, <Zm>.Q

Decoding algorithm

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');

Operation

CheckStreamingSVEEnabled();
constant integer VL = CurrentVL;
if VL < esize * 2 then EndOfDecode(Decode_UNDEF);
constant integer pairs = VL DIV (esize * 2);
constant bits(VL) operand0 = Z[n, VL];
constant bits(VL) operand1 = Z[m, VL];
bits(VL) result;

for r = 0 to 1
    constant integer base = r * pairs;
    for p = 0 to pairs-1
        Elem[result, 2*p+0, esize] = Elem[operand0, base+p, esize];
        Elem[result, 2*p+1, esize] = Elem[operand1, base+p, esize];
    Z[d+r, VL] = result;

Explanations

<Zd1>: Is the name of the first scalable vector register of the destination multi-vector group, encoded as "Zd" times 2.
<T>: <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.

Operational Notes

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.