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PRFW (scalar plus scalar)

Contiguous prefetch words (scalar index).

Contiguous prefetch of word elements from the memory address generated by a 64-bit scalar base and scalar index which is multiplied by 4 and added to the base address. After each element prefetch the index value is incremented, but the index register is not updated.

The predicate may be used to suppress prefetches from unwanted addresses.

313029282726252423222120191817161514131211109876543210
10000101000Rm110PgRn0prfop
msz<1>msz<0>

SVE

PRFW <prfop>, <Pg>, [<Xn|SP>, <Xm>, LSL #2]

if !HaveSVE() then UNDEFINED;
if Rm == '11111' then UNDEFINED;
integer esize = 32;
integer g = UInt(Pg);
integer n = UInt(Rn);
integer m = UInt(Rm);
integer level = UInt(prfop<2:1>);
boolean stream = (prfop<0> == '1');
pref_hint = if prfop<3> == '0' then Prefetch_READ else Prefetch_WRITE;
integer scale = 2;

Assembler Symbols

<prfop> Is the prefetch operation specifier, encoded in prfop:
prfop <prfop>
0000 PLDL1KEEP
0001 PLDL1STRM
0010 PLDL2KEEP
0011 PLDL2STRM
0100 PLDL3KEEP
0101 PLDL3STRM
x11x #uimm4
1000 PSTL1KEEP
1001 PSTL1STRM
1010 PSTL2KEEP
1011 PSTL2STRM
1100 PSTL3KEEP
1101 PSTL3STRM
<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.

Operation

CheckSVEEnabled();
integer elements = VL DIV esize;
bits(PL) mask = P[g];
bits(64) base;
bits(64) offset = X[m];
bits(64) addr;

if n == 31 then
    base = SP[];
else
    base = X[n];

for e = 0 to elements-1
    if ElemP[mask, e, esize] == '1' then
        addr = base + (UInt(offset) << scale);
        Hint_Prefetch(addr, pref_hint, level, stream);
    offset = offset + 1;