SVDOT (2-way)

Multi-vector signed integer vertical dot-product by indexed element

The signed integer vertical dot product instruction computes the vertical dot product of the corresponding two signed 16-bit integer values held in the two first source vectors and two signed 16-bit integer values in the corresponding indexed 32-bit element of the second source vector. The widened dot product results are destructively added to the corresponding 32-bit element of the ZA single-vector groups.

The groups within the second source vector are specified using an immediate element index which selects the same group position within each 128-bit vector segment. The index range is from 0 to 3, encoded in 2 bits.

The vector numbers forming the single-vector group within each half of the ZA array are selected by the sum of the vector select register and immediate offset, modulo half the number of ZA array vectors.

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

This instruction is unpredicated.

SME2
(FEAT_SME2)

if !HaveSME2() then UNDEFINED; integer v = UInt('010':Rv); constant integer esize = 32; integer n = UInt(Zn:'0'); integer m = UInt('0':Zm); integer offset = UInt(off3); integer index = UInt(i2);