Set scalar to count from predicate-as-counter
Counts the number of true elements in the source predicate and places the scalar result in the destination general-purpose register.
| 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 | size | 1 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | vl | 1 | PNn | Rd | ||||||||
| opc | |||||||||||||||||||||||||||||||
if !IsFeatureImplemented(FEAT_SME2) && !IsFeatureImplemented(FEAT_SVE2p1) then EndOfDecode(Decode_UNDEF); constant integer esize = 8 << UInt(size); constant integer n = UInt(PNn); constant integer d = UInt(Rd); constant integer width = 2 << UInt(vl);
| <Xd> |
Is the 64-bit name of the destination general-purpose register, encoded in the "Rd" field. |
| <PNn> |
Is the name of the source scalable predicate register, with predicate-as-counter encoding, encoded in the "PNn" field. |
| <T> |
Is the size specifier,
encoded in
|
| <vl> |
Is the vl specifier,
encoded in
|
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(64) sum = Zeros(64); constant integer maxelements = elements * width; for e = 0 to maxelements-1 if ActivePredicateElement(mask, e, esize) then sum = sum + 1; X[d, 64] = sum;
Internal version only: aarchmrs v2024-12_rel, pseudocode v2024-12_rel ; Build timestamp: 2024-12-15T22:18
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