WHILELS (predicate as counter)

While incrementing unsigned scalar lower or same as scalar (predicate-as-counter)

Generate 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 or same as the second scalar operand and false thereafter up to the highest numbered element of the group.

If the second scalar operand is equal to the maximum unsigned integer value then a condition which includes an equality test can never fail and the result will be an all-true predicate.

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. Sets the First (N), None (Z), !Last (C) condition flags based on the predicate result, and the V flag to zero.

SVE2
(FEAT_SVE2p1)

if !IsFeatureImplemented(FEAT_SME2) && !IsFeatureImplemented(FEAT_SVE2p1) then UNDEFINED; constant integer esize = 8 << UInt(size); constant integer rsize = 64; constant integer n = UInt(Rn); constant integer m = UInt(Rm); constant integer d = UInt('1':PNd); constant boolean unsigned = TRUE; constant boolean invert = FALSE; constant SVECmp op = Cmp_LE; constant integer width = 2 << UInt(vl);