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VSDOT (vector)

Dot Product vector form with signed integers. This instruction performs the dot product of the four 8-bit elements in each 32-bit element of the first source register with the four 8-bit elements of the corresponding 32-bit element in the second source register, accumulating the result into the corresponding 32-bit element of the destination register.

In Armv8.2 and Armv8.3, this is an OPTIONAL instruction. From Armv8.4 it is mandatory for all implementations to support it.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) .

A1
(FEAT_DotProd)

Decode for all variants of this encoding

if !IsFeatureImplemented(FEAT_DotProd) then Undefined(); end; if Q == '1' && (Vd[0] == '1' || Vn[0] == '1' || Vm[0] == '1') then Undefined(); end; let signed : boolean = U=='0'; let d : integer = UInt(D::Vd); let n : integer = UInt(N::Vn); let m : integer = UInt(M::Vm); let esize : integer{} = 32; let regs : integer = if Q == '1' then 2 else 1;

T1
(FEAT_DotProd)

Decode for all variants of this encoding

if InITBlock() then UnpredictableProcedure(); end; if !IsFeatureImplemented(FEAT_DotProd) then Undefined(); end; if Q == '1' && (Vd[0] == '1' || Vn[0] == '1' || Vm[0] == '1') then Undefined(); end; let signed : boolean = U=='0'; let d : integer = UInt(D::Vd); let n : integer = UInt(N::Vn); let m : integer = UInt(M::Vm); let esize : integer{} = 32; let regs : integer = if Q == '1' then 2 else 1;