SADDV Signed add reduction to scalar Signed add horizontally across all lanes of a vector, and place the result in the SIMD&FP scalar destination register. Narrow elements are first sign-extended to 64 bits. Inactive elements in the source vector are treated as zero. Green True True 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 1 SADDV <Dd>, <Pg>, <Zn>.<T> if !IsFeatureImplemented(FEAT_SVE) && !IsFeatureImplemented(FEAT_SME) then UNDEFINED; if size == '11' then UNDEFINED; constant integer esize = 8 << UInt(size); constant integer g = UInt(Pg); constant integer n = UInt(Zn); constant integer d = UInt(Vd); <Dd> Is the 64-bit name of the destination SIMD&FP register, encoded in the "Vd" field. <Pg> Is the name of the governing scalable predicate register P0-P7, encoded in the "Pg" field. <Zn> Is the name of the source scalable vector register, encoded in the "Zn" field. <T> Is the size specifier, size <T> 00 B 01 H 10 S 11 RESERVED 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) operand = Z[n, VL]; integer sum = 0; for e = 0 to elements-1 if ActivePredicateElement(mask, e, esize) then constant integer element = SInt(Elem[operand, e, esize]); sum = sum + element; V[d, 64] = sum<63:0>;