FMMLA (widening, 8-bit floating-point to half-precision)

8-bit floating-point matrix multiply-accumulate to half-precision

This instruction multiplies the 2×4 matrix of 8-bit floating-point values held in each 64-bit segment of the first source vector by the 4×2 matrix of 8-bit floating-point values in the corresponding segment of the second source vector. The intermediate half-precision results, calculated as a fused sum-of-products using four adjacent 8-bit floating-point values from each of the source vectors, are scaled by 2^{-UInt(FPMR.LSCALE[3:0])} before being destructively added without intermediate rounding to the 2x2 half-precision matrix in the corresponding segment of the destination vector. This is equivalent to accumulating 4-way dot product per destination element.

The 8-bit floating-point encoding format for the elements of the first source vector is selected by FPMR.F8S1. The 8-bit floating-point encoding format for the elements of the second source vector is selected by FPMR.F8S2.

Advanced SIMD
(FEAT_F8F16MM)

Decode for this encoding

if !IsFeatureImplemented(FEAT_F8F16MM) then EndOfDecode(Decode_UNDEF); end; let n : integer = UInt(Rn); let m : integer = UInt(Rm); let d : integer = UInt(Rd);