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LD1RSW

Load and broadcast signed word to vector.

Load a single signed word from a memory address generated by a 64-bit scalar base address plus an immediate offset which is a multiple of 4 in the range 0 to 252.

Broadcast the loaded data into all active elements of the destination vector, setting the inactive elements to zero. If all elements are inactive then the instruction will not perform a read from Device memory or cause a data abort.

313029282726252423222120191817161514131211109876543210
1000010011imm6100PgRnZt
dtypeh<1>dtypeh<0>dtypel<1>dtypel<0>

SVE

LD1RSW { <Zt>.D }, <Pg>/Z, [<Xn|SP>{, #<imm>}]

if !HaveSVE() then UNDEFINED;
integer t = UInt(Zt);
integer n = UInt(Rn);
integer g = UInt(Pg);
integer esize = 64;
integer msize = 32;
boolean unsigned = FALSE;
integer offset = UInt(imm6);

Assembler Symbols

<Zt>

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

<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.

<imm>

Is the optional unsigned immediate byte offset, a multiple of 4 in the range 0 to 252, defaulting to 0, encoded in the "imm6" field.

Operation

CheckSVEEnabled();
integer elements = VL DIV esize;
bits(64) base;
bits(64) addr;
bits(PL) mask = P[g];
bits(VL) result;
bits(msize) data;
constant integer mbytes = msize DIV 8;

if HaveMTEExt() then SetTagCheckedInstruction(TRUE);

if n == 31 then
    if LastActiveElement(mask, esize) >= 0 || 
          ConstrainUnpredictableBool(Unpredictable_CHECKSPNONEACTIVE) then 
        CheckSPAlignment();
    base = SP[];
else
    base = X[n];

integer last = LastActiveElement(mask, esize);
if last >= 0 then
    addr = base + offset * mbytes;
    data = Mem[addr, mbytes, AccType_NORMAL];

for e = 0 to elements-1
    if ElemP[mask, e, esize] == '1' then
        Elem[result, e, esize] = Extend(data, esize, unsigned);
    else
        Elem[result, e, esize] = Zeros();

Z[t] = result;