WHILELO (predicate as counter)

While incrementing unsigned scalar lower than scalar (predicate-as-counter)

This instruction generates a predicate for a group of two or four vectors that starting from the lowest numbered element of the group is true while the incrementing value of the first, unsigned scalar operand is lower than the second scalar operand and false thereafter up to the highest numbered element of the group.

The full width of the scalar operands is significant for the purposes of comparison, and the full width first operand is incremented by one for each destination predicate element, irrespective of the predicate result element size.

The predicate result is placed in the predicate destination register using the predicate-as-counter encoding. This instruction sets the First (N), None (Z), and !Last (C) condition flags based on the predicate result, and sets the V flag to zero.

SVE2
(FEAT_SME2 || FEAT_SVE2p1)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2) && !IsFeatureImplemented(FEAT_SVE2p1) then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 8 << UInt(size); let rsize : integer{} = 64; let n : integer = UInt(Rn); let m : integer = UInt(Rm); let d : integer = UInt('1'::PNd); let unsigned : boolean = TRUE; let invert : boolean = FALSE; let op : CmpOp = Cmp_LT; let width : integer = 2 << UInt(vl);