PEXT (predicate) Predicate extract from predicate-as-counter Converts the source predicate-as-counter into a four register wide predicate-as-mask, and copies the portion of the mask value selected by the portion index to the destination predicate register. A portion corresponds to a one predicate register fraction of the wider predicate-as-mask value. Green False 0 0 1 0 0 1 0 1 1 0 0 0 0 0 0 1 1 1 0 0 1 PEXT <Pd>.<T>, <PNn>[<imm>] if !IsFeatureImplemented(FEAT_SME2) && !IsFeatureImplemented(FEAT_SVE2p1) then UNDEFINED; constant integer esize = 8 << UInt(size); constant integer n = UInt('1':PNn); constant integer d = UInt(Pd); constant integer part = UInt(imm2); <Pd> Is the name of the destination scalable predicate register, encoded in the "Pd" field. <T> Is the size specifier, size <T> 00 B 01 H 10 S 11 D <PNn> Is the name of the first source scalable predicate register PN8-PN15, with predicate-as-counter encoding, encoded in the "PNn" field. <imm> Is the portion index, in the range 0 to 3, encoded in the "imm2" field. if IsFeatureImplemented(FEAT_SVE2p1) then CheckSVEEnabled(); else CheckStreamingSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV esize; constant bits(PL) pred = P[n, PL]; constant bits(PL*4) mask = CounterToPredicate(pred<15:0>, PL*4); bits(PL) result; constant integer psize = esize DIV 8; for e = 0 to elements-1 constant bit pbit = PredicateElement(mask, part * elements + e, esize); Elem[result, e, psize] = ZeroExtend(pbit, psize); P[d, PL] = result;