ST3B (scalar plus scalar)

Contiguous store three-byte structures from three vectors (scalar index)

Contiguous store three-byte structures, each from the same element number in three vector registers to the memory address generated by a 64-bit scalar base and a 64-bit scalar index register and added to the base address. After each structure access the index value is incremented by three. The index register is not updated by the instruction.

Each predicate element applies to the same element number in each of the three vector registers, or equivalently to the three consecutive bytes in memory which make up each structure. Inactive structures are not written to memory.

Encoding: SVE

Variants: FEAT_SVE || FEAT_SME (FEAT_SVE || FEAT_SME)

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	1	0	0	1	0	0	0	1	0	!= 11111					0	1	1
							msz		opc		Rm								Pg			Rn					Zt

ST3B { <Zt1>.B, <Zt2>.B, <Zt3>.B }, <Pg>, [<Xn|SP>, <Xm>]

Decoding algorithm

if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then
    EndOfDecode(Decode_UNDEF);
if Rm == '11111' then EndOfDecode(Decode_UNDEF);
constant integer t = UInt(Zt);
constant integer n = UInt(Rn);
constant integer m = UInt(Rm);
constant integer g = UInt(Pg);
constant integer esize = 8;
constant integer nreg = 3;

Operation

CheckSVEEnabled();
constant integer VL = CurrentVL;
constant integer PL = VL DIV 8;
constant integer elements = VL DIV esize;
bits(64) base;
constant bits(PL) mask = P[g, PL];
bits(64) offset;
bits(64) addr;
constant integer mbytes = esize DIV 8;
array [0..2] of bits(VL) values;
constant boolean contiguous = TRUE;
constant boolean nontemporal = FALSE;
constant boolean tagchecked = TRUE;
constant AccessDescriptor accdesc = CreateAccDescSVE(MemOp_STORE, nontemporal, contiguous,
                                                     tagchecked);

if !AnyActiveElement(mask, esize) then
    if n == 31 && ConstrainUnpredictableBool(Unpredictable_CHECKSPNONEACTIVE) then
        CheckSPAlignment();
else
    if n == 31 then CheckSPAlignment();

base = if n == 31 then SP[64] else X[n, 64];
offset = X[m, 64];
addr = AddressAdd(base, UInt(offset) * mbytes, accdesc);

for r = 0 to nreg-1
    values[r] = Z[(t+r) MOD 32, VL];

for e = 0 to elements-1
    for r = 0 to nreg-1
        if ActivePredicateElement(mask, e, esize) then
            Mem[addr, mbytes, accdesc] = Elem[values[r], e, esize];
        addr = AddressIncrement(addr, mbytes, accdesc);

Explanations

<Zt1>: Is the name of the first scalable vector register to be transferred, encoded in the "Zt" field.
<Zt2>: Is the name of the second scalable vector register to be transferred, encoded as "Zt" plus 1 modulo 32.
<Zt3>: Is the name of the third scalable vector register to be transferred, encoded as "Zt" plus 2 modulo 32.
<Pg>: Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field.
<Xn|SP>: Is the 64-bit name of the general-purpose base register or stack pointer, encoded in the "Rn" field.
<Xm>: Is the 64-bit name of the general-purpose offset register, encoded in the "Rm" field.

Operational Notes

If PSTATE.DIT is 1, the timing of this instruction is insensitive to the value of the data being loaded or stored when its governing predicate register contains the same value for each execution.