FMLALB, FMLALT (vector)

8-bit floating-point multiply-add to half-precision (vector)

This instruction widens the even-numbered (bottom) or odd-numbered (top) 8-bit elements in the first and second source vectors to half-precision format and multiplies the corresponding elements. The intermediate products are scaled by 2^{-UInt(FPMR.LSCALE[3:0])}, before being destructively added without intermediate rounding to the half-precision elements of the destination vector that overlap with the corresponding 8-bit floating-point elements in the source vectors.

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_FP8FMA)

Decode for all variants of this encoding

if !IsFeatureImplemented(FEAT_FP8FMA) then EndOfDecode(Decode_UNDEF); end; let d : integer{} = UInt(Rd); let n : integer{} = UInt(Rn); let m : integer{} = UInt(Rm); let elements : integer = 128 DIV 16; let sel : integer = UInt(Q);