PRFH (scalar plus scalar)

Contiguous prefetch halfwords (scalar index)

This instruction prefetches contiguous halfword elements from the memory address generated by a 64-bit scalar base and scalar index that is multiplied by 2 and added to the base address. After each element prefetch the index value is incremented, but the index register is not updated.

The <prfop> operand specifies the prefetch hint as follows:

• Access type:
  • PLD for prefetch for load.
  • PST for prefetch for store.
• Target cache level:
  • L1 for Level 1 cache.
  • L2 for Level 2 cache.
  • L3 for Level 3 cache.
• Policy:
  • KEEP for retained or temporal prefetch, allocated in the cache normally.
  • STRM for streaming or non-temporal prefetch, for data that is used only once.

SVE
(FEAT_SVE || FEAT_SME)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 16; let g : integer = UInt(Pg); let n : integer = UInt(Rn); let m : integer = UInt(Rm); let level : integer = UInt(prfop[2:1]); let stream : boolean = (prfop[0] == '1'); let pref_hint : PrefetchHint = if prfop[3] == '0' then Prefetch_READ else Prefetch_WRITE; let scale : integer = 1;