UDOT (2-way, multiple vectors)

Multi-vector unsigned 16-bit integer dot product to 32-bit integer

This instruction calculates the dot product of two unsigned 16-bit integer values held in each 32-bit element of the two or four first source vectors and two unsigned 16-bit integer values in the corresponding 32-bit element of the two or four second source vectors. The widened dot product result is destructively added to the corresponding 32-bit element of the ZA single-vector groups.

The single-vector group within each half of or each quarter of the ZA array is selected by the sum of the vector select register and offset, modulo half or quarter the number of ZA array vectors.

The vector group symbol, VGx2 or VGx4, indicates that the ZA operand consists of two or four ZA single-vector groups respectively. The vector group symbol is preferred for disassembly, but optional in assembler source code.

This instruction is unpredicated.

It has encodings from 2 classes: Two ZA single-vectors and Four ZA single-vectors

Two ZA single-vectors
(FEAT_SME2)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); end; let v : integer = UInt('010'::Rv); let esize : integer{} = 32; let n : integer = UInt(Zn::'0'); let m : integer = UInt(Zm::'0'); let offset : integer = UInt(off3); let nreg : integer{} = 2;

Four ZA single-vectors
(FEAT_SME2)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); end; let v : integer = UInt('010'::Rv); let esize : integer{} = 32; let n : integer = UInt(Zn::'00'); let m : integer = UInt(Zm::'00'); let offset : integer = UInt(off3); let nreg : integer{} = 4;