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Contiguous prefetch of word elements from the memory address generated by a 64-bit scalar base and immediate index in the range -32 to 31 which is multiplied by the vector's in-memory size, irrespective of predication, and added to the base address.
The predicate may be used to suppress prefetches from unwanted addresses.
Contiguous prefetch words (immediate index).
Contiguous prefetch of word elements from the memory address generated by a 64-bit scalar base and immediate index in the range -32 to 31 which is multiplied by the vector's in-memory size, irrespective of predication, and added to the base address.
The predicate may be used to suppress prefetches from unwanted addresses.
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 | 0 | 0 | 0 | 0 | 1 | 0 | 1 | 1 | 1 | imm6 | 0 | 1 | 0 | Pg | Rn | 0 | prfop | ||||||||||||||
msz<1> | msz<0> |
if !HaveSVE() then UNDEFINED; integer esize = 32; integer g = UInt(Pg); integer n = UInt(Rn); 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; integer offset = SInt(imm6);
<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 signed immediate vector offset, in the range -32 to 31, defaulting to 0, encoded in the "imm6" field. |
CheckSVEEnabled();
integer elements = VL DIV esize;
bits(PL) mask = P[g];
bits(64) base;
bits(64) addr;
if n == 31 then
base = SP[];
else
base = X[n];
addr = base + ((offset * elements) << scale);
for e = 0 to elements-1
if ElemP[mask, e, esize] == '1' then
Hint_Prefetch(addr, pref_hint, level, stream);
addr = addr + (1 << scale);
CheckSVEEnabled(); integer elements = VL DIV esize; bits(PL) mask = P[g]; bits(64) base; if AnyActiveElement(mask, esize) then base = if n == 31 then SP[] else X[n]; for e = 0 to elements-1 if ElemP[mask, e, esize] == '1' then integer eoff = (offset * elements) + e; bits(64) addr = base + (eoff << scale); Hint_Prefetch(addr, pref_hint, level, stream);
Internal version only: isa v32.13v32.12, AdvSIMD v29.05v29.04, pseudocode v2020-12v2020-09_xml, sve v2020-12v2020-09_rc3
; Build timestamp: 2020-12-16T142020-11-18T17:1723
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