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LDFF1D (vector plus immediate)

Gather load first-fault doublewords to vector (immediate index).

Gather load with first-faulting behavior of doublewords to active elements of a vector register from memory addresses generated by a vector base plus immediate index. The index is a multiple of 8 in the range 0 to 248. Inactive elements will not cause a read from Device memory or signal faults, and are set to zero in the destination vector.


LDFF1D { <Zt>.D }, <Pg>/Z, [<Zn>.D{, #<imm>}]

if !HaveSVE() then UNDEFINED;
integer t = UInt(Zt);
integer n = UInt(Zn);
integer g = UInt(Pg);
integer esize = 64;
integer msize = 64;
boolean unsigned = TRUE;
integer offset = UInt(imm5);

Assembler Symbols


Is the name of the scalable vector register to be transferred, encoded in the "Zt" field.


Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field.


Is the name of the base scalable vector register, encoded in the "Zn" field.


Is the optional unsigned immediate byte offset, a multiple of 8 in the range 0 to 248, defaulting to 0, encoded in the "imm5" field.


integer elements = VL DIV esize;
bits(VL) base = Z[n];
bits(64) addr;
bits(PL) mask = P[g];
bits(VL) result;
bits(VL) orig = Z[t];
bits(msize) data;
constant integer mbytes = msize DIV 8;
boolean first = TRUE;
boolean fault = FALSE;
boolean faulted = FALSE;
boolean unknown = FALSE;

if HaveMTEExt() then SetTagCheckedInstruction(TRUE);

for e = 0 to elements-1
    if ElemP[mask, e, esize] == '1' then
        addr = ZeroExtend(Elem[base, e, esize], 64) + offset * mbytes;
        if first then
            // Mem[] will not return if a fault is detected for the first active element
            data = Mem[addr, mbytes, AccType_NORMAL];
            first = FALSE;
            // MemNF[] will return fault=TRUE if access is not performed for any reason
            (data, fault) = MemNF[addr, mbytes, AccType_NONFAULT];
        (data, fault) = (Zeros(msize), FALSE);

    // FFR elements set to FALSE following a supressed access/fault
    faulted = faulted || fault;
    if faulted then
        ElemFFR[e, esize] = '0';

    // Value becomes CONSTRAINED UNPREDICTABLE after an FFR element is FALSE
    unknown = unknown || ElemFFR[e, esize] == '0';
    if unknown then
        if !fault && ConstrainUnpredictableBool(Unpredictable_SVELDNFDATA) then
            Elem[result, e, esize] = Extend(data, esize, unsigned);
        elsif ConstrainUnpredictableBool(Unpredictable_SVELDNFZERO) then
            Elem[result, e, esize] = Zeros();
        else  // merge
            Elem[result, e, esize] = Elem[orig, e, esize];
        Elem[result, e, esize] = Extend(data, esize, unsigned);

Z[t] = result;