FDOT (2-way, indexed, FP16 to FP32)

Half-precision dot product by indexed element to single-precision

This instruction calculates the fused sum-of-products of a pair of half-precision values held in each 32-bit element of the first source vector and a pair of half-precision values in an indexed 32-bit element of the second source vector, without intermediate rounding, and then destructively adds the single-precision sum-of-products to the corresponding single-precision element of the destination vector.

The half-precision pairs within the second source vector are specified using an immediate index that selects the same pair position within each 128-bit vector segment. The index range is from 0 to 3.

This instruction is unpredicated.

SVE2
(FEAT_SME2 || FEAT_SVE2p1)

Decode for this encoding

if !IsFeatureImplemented(FEAT_SME2) && !IsFeatureImplemented(FEAT_SVE2p1) then EndOfDecode(Decode_UNDEF); end; let n : integer = UInt(Zn); let m : integer = UInt(Zm); let da : integer = UInt(Zda); let index : integer = UInt(i2);