ZIPQ1

Interleave elements from low halves of each pair of quadword vector segments

Interleave alternating elements from low halves of the corresponding 128-bit vector segments of the first and second source vectors and place in elements of the corresponding destination vector segment. This instruction is unpredicated.

Encoding: SVE2

Variants: FEAT_SVE2p1 || FEAT_SME2p1 (FEAT_SVE2p1 || FEAT_SME2p1)

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

ZIPQ1 <Zd>.<T>, <Zn>.<T>, <Zm>.<T>

Decoding algorithm

if !IsFeatureImplemented(FEAT_SVE2p1) && !IsFeatureImplemented(FEAT_SME2p1) 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);
constant integer part = 0;

Operation

CheckSVEEnabled();
constant integer VL = CurrentVL;
constant integer segments = VL DIV 128;
constant integer elements = 128 DIV esize;
constant integer pairs = elements DIV 2;
constant bits(VL) operand1 = Z[n, VL];
constant bits(VL) operand2 = Z[m, VL];
bits(VL) result;

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

Z[d, VL] = result;

Explanations

<Zd>: Is the name of the destination scalable vector register, encoded in the "Zd" field.
<T>: <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.