FMLALT (indexed, FP8 to FP16)

8-bit floating-point multiply-add long to half-precision (top, indexed)

This 8-bit floating-point multiply-add long 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_FP8FMA)

if !HaveSVE2FP8FMA() then UNDEFINED; constant integer n = UInt(Zn); constant integer m = UInt(Zm); constant integer da = UInt(Zda); constant integer index = UInt(i4h:i4l);