LUTI4 (four registers, 16-bit and 32-bit)

Lookup table read with 4-bit indexes (four registers)

This instruction copies 16-bit or 32-bit elements from ZT0 to four destination vectors using packed 4-bit indices from a segment of the source vector register. A segment corresponds to a portion of the source vector that is consumed in order to fill the destination vector. The segment is selected by the vector segment index modulo the total number of segments.

This instruction is unpredicated.

It has encodings from 2 classes: Consecutive and Strided

Consecutive
(FEAT_SME2)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); end; if size == '00' || size == '11' then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 8 << UInt(size); let isize : integer{} = 4; let n : integer = UInt(Zn); let dstride : integer = 1; let d : integer = UInt(Zd::'00'); let imm : integer = UInt(i1); let nreg : integer{} = 4;

Strided
(FEAT_SME2p1)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2p1) then EndOfDecode(Decode_UNDEF); end; if size != '01' then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 8 << UInt(size); let isize : integer{} = 4; let n : integer = UInt(Zn); let dstride : integer = 4; let d : integer = UInt(D::'00'::Zd); let imm : integer = UInt(i1); let nreg : integer{} = 4;