MSB Multiply-subtract vectors (predicated), writing multiplicand [Zdn = Za - Zdn * Zm] Multiply the corresponding active elements of the first and second source vectors and subtract from elements of the third (addend) vector. Destructively place the results in the destination and first source (multiplicand) vector. Inactive elements in the destination vector register remain unmodified. Green True True True True 0 0 0 0 0 1 0 0 0 1 1 1 MSB <Zdn>.<T>, <Pg>/M, <Zm>.<T>, <Za>.<T> if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then UNDEFINED; constant integer esize = 8 << UInt(size); constant integer g = UInt(Pg); constant integer dn = UInt(Zdn); constant integer m = UInt(Zm); constant integer a = UInt(Za); constant boolean sub_op = TRUE; <Zdn> Is the name of the first source and destination scalable vector register, encoded in the "Zdn" field. <T> Is the size specifier, size <T> 00 B 01 H 10 S 11 D <Pg> Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field. <Zm> Is the name of the second source scalable vector register, encoded in the "Zm" field. <Za> Is the name of the third source scalable vector register, encoded in the "Za" field. CheckSVEEnabled(); constant integer VL = CurrentVL; constant integer PL = VL DIV 8; constant integer elements = VL DIV esize; constant bits(PL) mask = P[g, PL]; constant bits(VL) operand1 = Z[dn, VL]; constant bits(VL) operand2 = if AnyActiveElement(mask, esize) then Z[m, VL] else Zeros(VL); constant bits(VL) operand3 = if AnyActiveElement(mask, esize) then Z[a, VL] else Zeros(VL); bits(VL) result; for e = 0 to elements-1 if ActivePredicateElement(mask, e, esize) then constant integer element1 = UInt(Elem[operand1, e, esize]); constant integer element2 = UInt(Elem[operand2, e, esize]); constant integer product = element1 * element2; if sub_op then Elem[result, e, esize] = Elem[operand3, e, esize] - product; else Elem[result, e, esize] = Elem[operand3, e, esize] + product; else Elem[result, e, esize] = Elem[operand1, e, esize]; Z[dn, VL] = result;