SQDMLALB (vectors)

Signed saturating doubling multiply-add (bottom)

This instruction multiples the even-numbered signed elements of the first source vector by the corresponding elements of the second source vector, and then doubles the result of the multiplication. Each intermediate value is saturated to the double-width N-bit value's signed integer range -2^(N-1) to (2^(N-1))-1 and is then destructively added to the overlapping double-width elements of the addend and destination vector. Each destination element is saturated to the double-width N-bit element's signed integer range -2^(N-1) to (2^(N-1))-1. This instruction is unpredicated.

SVE2
(FEAT_SVE2 || FEAT_SME)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SVE2) && !IsFeatureImplemented(FEAT_SME) then EndOfDecode(Decode_UNDEF); end; if size == '00' then EndOfDecode(Decode_UNDEF); end; let esize : integer{} = 8 << UInt(size); let n : integer = UInt(Zn); let m : integer = UInt(Zm); let da : integer = UInt(Zda); let sel1 : integer = 0; let sel2 : integer = 0;