SQDMLALT (vectors)

Signed saturating doubling multiply-add (top)

This instruction multiplies the odd-numbered signed elements of the first source vector by the corresponding elements of the second source vector, and then doubles the result. 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 = 1; let sel2 : integer = 1;