FMLALT (indexed, FP8 to FP16)

8-bit floating-point multiply-add by indexed element to half-precision (top)

This instruction widens the odd 8-bit elements in the first source vector and the indexed element from the corresponding 128-bit segment in the second source vector 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 first source vector. The 8-bit floating-point encoding format for the elements of the first source vector and the second source vector is selected by FPMR.F8S1 and FPMR.F8S2 respectively.

This instruction is unpredicated.

SVE2
((FEAT_SVE2 && FEAT_FP8FMA) || FEAT_SSVE_FP8FMA)

Decode for this encoding

if !HaveSVE2FP8FMA() then EndOfDecode(Decode_UNDEF); end; let n : integer = UInt(Zn); let m : integer = UInt(Zm); let da : integer = UInt(Zda); let index : integer = UInt(i4h::i4l);