Bitwise exclusive NOR population count outer product and accumulate
This instruction works with 32-bit element ZA tile. This instruction generates an outer product of the first source SVLS×1 vector and the second source 1×SVLS vector. Each outer product element is obtained as population count of the bitwise XNOR result of the corresponding 32-bit elements of the first source vector and the second source vector. Each source vector is independently predicated by a corresponding governing predicate. When either source vector element is inactive the corresponding destination tile element remains unmodified. The resulting SVLS×SVLS product is then destructively added to the destination tile.
| 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 |
| 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | Zm | Pm | Pn | Zn | 0 | 1 | 0 | ZAda | |||||||||||||
| S | |||||||||||||||||||||||||||||||
if !HaveSME2() then UNDEFINED; constant integer esize = 32; integer a = UInt(Pn); integer b = UInt(Pm); integer n = UInt(Zn); integer m = UInt(Zm); integer da = UInt(ZAda); boolean sub_op = FALSE;
| <ZAda> |
Is the name of the ZA tile ZA0-ZA3, encoded in the "ZAda" field. |
| <Pn> |
Is the name of the first governing scalable predicate register P0-P7, encoded in the "Pn" field. |
| <Pm> |
Is the name of the second governing scalable predicate register P0-P7, encoded in the "Pm" field. |
| <Zn> |
Is the name of the first source scalable vector register, encoded in the "Zn" field. |
| <Zm> |
Is the name of the second source scalable vector register, encoded in the "Zm" field. |
CheckStreamingSVEAndZAEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer dim = VL DIV esize; bits(PL) mask1 = P[a, PL]; bits(PL) mask2 = P[b, PL]; bits(VL) operand1 = Z[n, VL]; bits(VL) operand2 = Z[m, VL]; bits(dim*dim*esize) operand3 = ZAtile[da, esize, dim*dim*esize]; bits(dim*dim*esize) result; for row = 0 to dim-1 bits(esize) element1 = Elem[operand1, row, esize]; for col = 0 to dim-1 bits(esize) element2 = Elem[operand2, col, esize]; bits(esize) element3 = Elem[operand3, row*dim + col, esize]; if (ActivePredicateElement(mask1, row, esize) && ActivePredicateElement(mask2, col, esize)) then integer res = BitCount(NOT(element1 EOR element2)); if sub_op then res = -res; Elem[result, row*dim + col, esize] = element3 + res; else Elem[result, row*dim + col, esize] = element3; ZAtile[da, esize, dim*dim*esize] = result;
If PSTATE.DIT is 1:
Internal version only: aarchmrs v2023-12_rel, pseudocode v2023-12_rel, sve v2023-12_rel ; Build timestamp: 2023-12-15T16:46
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