USMLALL (multiple and indexed vector)

Multi-vector unsigned by signed 8-bit integer multiply-add by indexed element to 32-bit integer

This instruction multiplies each unsigned 8-bit element in the one, two, or four first source vectors by each signed 8-bit indexed element of the second source vector, widens each product to 32 bits, and destructively adds these values to the corresponding 32-bit elements of the ZA quad-vector groups.

The elements within the second source vector are specified using an immediate element index that selects the same element position within each 128-bit vector segment. The element index range is from 0 to one less than the number of elements per 128-bit segment.

The quad-vector group within all of, each half of, or each quarter of the ZA array is selected by the sum of the vector select register and offset range, modulo all, 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 quad-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 3 classes: One ZA quad-vector , Two ZA quad-vectors and Four ZA quad-vectors

One ZA quad-vector
(FEAT_SME2)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 32; let v : integer = UInt('010'::Rv); let n : integer = UInt(Zn); let m : integer = UInt('0'::Zm); let offset : integer = UInt(off2::'00'); let index : integer = UInt(i4h::i4l); let nreg : integer{} = 1;

Two ZA quad-vectors
(FEAT_SME2)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 32; let v : integer = UInt('010'::Rv); let n : integer = UInt(Zn::'0'); let m : integer = UInt('0'::Zm); let offset : integer = UInt(o1::'00'); let index : integer = UInt(i4h::i4l); let nreg : integer{} = 2;

Four ZA quad-vectors
(FEAT_SME2)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2) then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 32; let v : integer = UInt('010'::Rv); let n : integer = UInt(Zn::'00'); let m : integer = UInt('0'::Zm); let offset : integer = UInt(o1::'00'); let index : integer = UInt(i4h::i4l); let nreg : integer{} = 4;