MOVA (array to vector, two registers)

Move two ZA single-vector groups to two vector registers

This instruction operates on two ZA single-vector groups.

The single-vector group within each half of the ZA array is selected by the sum of the vector select register and offset, modulo half the number of ZA array vectors.

The vector group symbol VGx2 indicates that the instruction operates on two ZA single-vector groups.

The preferred disassembly syntax uses a 64-bit element size, but an assembler should accept any element size if it is used consistently for all operands. The vector group symbol is preferred for disassembly, but optional in assembler source code.

This instruction is unpredicated.

Encoding: SME2

Variants: FEAT_SME2 (ARMv9.3)

313029282726252423222120191817161514131211109876543210
11000000000001100010000
Rvoff3Zd

MOVA { <Zd1>.D-<Zd2>.D }, ZA.D[<Wv>, <offs>{, VGx2}]

Decoding algorithm

if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF);
constant integer v = UInt('010':Rv);
constant integer offset = UInt(off3);
constant integer d = UInt(Zd:'0');
constant integer nreg = 2;

Operation

CheckStreamingSVEAndZAEnabled();
constant integer VL = CurrentVL;
constant integer vectors = VL DIV 8;
constant integer vstride = vectors DIV nreg;
constant bits(32) vbase = X[v, 32];
integer vec = (UInt(vbase) + offset) MOD vstride;

for r = 0 to nreg-1
    constant bits(VL) result = ZAvector[vec, VL];
    Z[d + r, VL] = result;
    vec = vec + vstride;

Explanations

<Zd1>: Is the name of the first scalable vector register of the destination multi-vector group, encoded as "Zd" times 2.
<Zd2>: Is the name of the second scalable vector register of the destination multi-vector group, encoded as "Zd" times 2 plus 1.
<Wv>: Is the 32-bit name of the vector select register W8-W11, encoded in the "Rv" field.
<offs>: Is the vector select offset, in the range 0 to 7, encoded in the "off3" field.

Operational Notes

If PSTATE.DIT is 1: