ZERO (double-vector)

Zero ZA double-vector groups

The instruction zeroes one, two, or four ZA double-vector groups. The lowest of the two consecutive vector numbers forming the double-vector group within all of, each half of, or each quarter of the ZA array are selected by the sum of the vector select register and immediate offset, 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 double-vector groups respectively.

It has encodings from 3 classes: One ZA double-vector , Two ZA double-vectors and Four ZA double-vectors

One ZA double-vector
(FEAT_SME2p1)

if !HaveSME2p1() then UNDEFINED; integer v = UInt('010':Rv); integer offset = UInt(off3:'0'); constant integer ngrp = 1; constant integer nvec = 2;

Two ZA double-vectors
(FEAT_SME2p1)

if !HaveSME2p1() then UNDEFINED; integer v = UInt('010':Rv); integer offset = UInt(off2:'0'); constant integer ngrp = 2; constant integer nvec = 2;

Four ZA double-vectors
(FEAT_SME2p1)

if !HaveSME2p1() then UNDEFINED; integer v = UInt('010':Rv); integer offset = UInt(off2:'0'); constant integer ngrp = 4; constant integer nvec = 2;