Predicate extract pair from predicate-as-counter
Converts the source predicate-as-counter into a four register wide predicate-as-mask, and copies the two portions of the mask value selected by the portion index to the two destination predicate registers. A portion corresponds to a one predicate register fraction of the wider predicate-as-mask value.
Variants: FEAT_SME2 || FEAT_SVE2p1 (FEAT_SME2 || FEAT_SVE2p1)
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| 0 | 0 | 1 | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 0 | 1 | 0 | 1 | ||||||||||
| size | i1 | PNn | Pd | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
PEXT { <Pd1>.<T>, <Pd2>.<T> }, <PNn>[<imm>]
if !IsFeatureImplemented(FEAT_SME2) && !IsFeatureImplemented(FEAT_SVE2p1) then
EndOfDecode(Decode_UNDEF);
constant integer esize = 8 << UInt(size);
constant integer n = UInt('1':PNn);
constant integer d0 = UInt(Pd);
constant integer d1 = (UInt(Pd) + 1) MOD 16;
constant integer part = UInt(i1);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) result0; bits(PL) result1; constant integer psize = esize DIV 8; for e = 0 to elements-1 constant bit pbit = PredicateElement(mask, part * 2 * elements + e, esize); Elem[result0, e, psize] = ZeroExtend(pbit, psize); for e = 0 to elements-1 constant bit pbit = PredicateElement(mask, part * 2 * elements + elements + e, esize); Elem[result1, e, psize] = ZeroExtend(pbit, psize); P[d0, PL] = result0; P[d1, PL] = result1;